KEX 10-Q Quarterly Report Sept. 30, 2025 | Alphaminr

KEX 10-Q Quarter ended Sept. 30, 2025

KIRBY CORP
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10-Q
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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended September 30, 2025

or

Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from to

Commission File Number: 1-7615

KIRBY CORPORATION

(Exact name of registrant as specified in its charter)

Nevada

74-1884980

(I.R.S. Employer Identification No.)

(State or other jurisdiction of incorporation or organization)

55 Waugh Drive , Suite 1000

Houston , TX

77007

(Address of principal executive offices)

(Zip Code)

713 - 435-1000

(Registrant’s telephone number, including area code)

No Change

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock

KEX

New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulations S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

Accelerated filer

Non-accelerated filer

Smaller reporting company

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes No

As of November 7, 2025 , 54.2 million shares of the Registrant’s $0.10 par value per share common stock were outstanding.


PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES

CONDENSED BALANCE SHEETS

(Unaudited)

September 30,
2025

December 31,
2024

($ in thousands)

ASSETS

Current assets:

Cash and cash equivalents

$

47,025

$

74,444

Accounts receivable:

Trade – less allowance for doubtful accounts

524,072

489,857

Other

95,895

46,888

Inventories – net

423,976

393,898

Prepaid expenses and other current assets

68,863

63,472

Total current assets

1,159,831

1,068,559

Property and equipment

6,360,383

6,123,208

Accumulated depreciation

( 2,238,318

)

( 2,100,242

)

Property and equipment – net

4,122,065

4,022,966

Operating lease right-of-use assets

181,407

158,990

Goodwill

438,748

438,748

Other intangibles, net

30,956

34,406

Other assets

130,552

128,283

Total assets

$

6,063,559

$

5,851,952

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current liabilities:

Bank notes payable

$

7,283

$

8,226

Income taxes payable

587

25,417

Accounts payable

222,688

251,354

Accrued liabilities

219,581

236,813

Current portion of operating lease liabilities

44,322

35,727

Deferred revenues

189,309

177,216

Total current liabilities

683,770

734,753

Long-term debt, net – less current portion

1,041,632

866,722

Deferred income taxes

805,006

739,472

Operating lease liabilities – less current portion

159,261

148,170

Other long-term liabilities

10,649

9,587

Total long-term liabilities

2,016,548

1,763,951

Contingencies and commitments

Equity:

Kirby stockholders’ equity:

Common stock, $ 0.10 par value per share. Authorized 120 million shares, issued 65.5 million shares

6,547

6,547

Additional paid-in capital

870,520

868,763

Accumulated other comprehensive income – net

63,988

71,192

Retained earnings

3,241,131

2,978,372

Treasury stock – at cost, 10.7 million shares at September 30, 2025 and 8.2 million at December 31, 2024

( 821,007

)

( 573,061

)

Total Kirby stockholders’ equity

3,361,179

3,351,813

Noncontrolling interests

2,062

1,435

Total equity

3,363,241

3,353,248

Total liabilities and equity

$

6,063,559

$

5,851,952

See accompanying notes to condensed financial statements.

2


KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES

CONDENSED STATEMENTS OF EARNINGS

(Unaudited)

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

($ in thousands, except per share amounts)

Revenues:

Marine transportation

$

484,941

$

486,054

$

1,453,652

$

1,446,274

Distribution and services

386,220

345,095

1,058,623

1,017,287

Total revenues

871,161

831,149

2,512,275

2,463,561

Costs and expenses:

Costs of sales and operating expenses

580,491

552,091

1,656,065

1,657,004

Selling, general and administrative

87,812

84,119

268,945

254,708

Taxes, other than on income

9,768

8,973

29,140

27,327

Depreciation and amortization

66,873

60,653

196,273

177,777

Gain on disposition of assets

( 3,002

)

( 1,617

)

( 4,759

)

( 2,206

)

Total costs and expenses

741,942

704,219

2,145,664

2,114,610

Operating income

129,219

126,930

366,611

348,951

Other income

5,557

2,949

15,703

9,306

Interest expense

( 11,838

)

( 12,498

)

( 35,105

)

( 38,468

)

Earnings before taxes on income

122,938

117,381

347,209

319,789

Provision for taxes on income

( 30,200

)

( 27,350

)

( 83,823

)

( 75,861

)

Net earnings

92,738

90,031

263,386

243,928

Net earnings attributable to noncontrolling interests

( 242

)

( 63

)

( 627

)

( 38

)

Net earnings attributable to Kirby

$

92,496

$

89,968

$

262,759

$

243,890

Net earnings per share attributable to Kirby common stockholders:

Basic

$

1.66

$

1.56

$

4.67

$

4.20

Diluted

$

1.65

$

1.55

$

4.64

$

4.17

See accompanying notes to condensed financial statements.

3


KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES

CONDENSED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

($ in thousands)

Net earnings

$

92,738

$

90,031

$

263,386

$

243,928

Other comprehensive loss, net of taxes:

Pension and postretirement benefits

( 1,732

)

( 484

)

( 7,798

)

107

Foreign currency translation adjustments

108

( 22

)

594

( 495

)

Total other comprehensive loss, net of taxes

( 1,624

)

( 506

)

( 7,204

)

( 388

)

Total comprehensive income, net of taxes

91,114

89,525

256,182

243,540

Net earnings attributable to noncontrolling interests

( 242

)

( 63

)

( 627

)

( 38

)

Comprehensive income attributable to Kirby

$

90,872

$

89,462

$

255,555

$

243,502

See accompanying notes to condensed financial statements.

4


KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES

CONDENSED STATEMENTS OF CASH FLOWS
(Unaudited)

Nine Months Ended September 30,

2025

2024

($ in thousands)

Cash flows from operating activities:

Net earnings

$

263,386

$

243,928

Adjustments to reconcile net earnings to net cash provided by operations:

Depreciation and amortization

196,273

177,777

Provision for deferred income taxes

68,142

38,698

Amortization of share-based compensation

14,567

12,837

Amortization of major maintenance costs

22,354

24,965

Other

( 3,454

)

( 126

)

Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net

( 203,274

)

11,031

Net cash provided by operating activities

357,994

509,110

Cash flows from investing activities:

Capital expenditures

( 217,440

)

( 245,990

)

Acquisitions of businesses and marine equipment

( 106,450

)

( 65,232

)

Proceeds from disposition of assets

28,334

13,832

Other

( 3,000

)

Net cash used in investing activities

( 298,556

)

( 297,390

)

Cash flows from financing activities:

Borrowings (payments) on bank credit facilities, net

174,057

( 38,893

)

Payment of debt issuance costs

( 3

)

Proceeds from exercise of stock options

262

8,375

Payments related to tax withholding for share-based compensation

( 5,977

)

( 5,356

)

Treasury stock purchases

( 252,638

)

( 141,272

)

Other

( 2,561

)

( 75

)

Net cash used in financing activities

( 86,857

)

( 177,224

)

Increase (decrease) in cash and cash equivalents

( 27,419

)

34,496

Cash and cash equivalents, beginning of year

74,444

32,577

Cash and cash equivalents, end of period

$

47,025

$

67,073

Supplemental disclosures of cash flow information:

Cash paid during the period:

Interest paid

$

42,787

$

46,600

Income taxes paid, net

$

80,966

$

15,476

Operating cash outflow from operating leases

$

38,175

$

34,898

Non-cash investing activity:

Capital expenditures included in accounts payable

$

10,564

$

1,729

Right-of-use assets obtained in exchange for lease obligations

$

50,811

$

38,730

See accompanying notes to condensed financial statements.

5


KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES

CONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited)

Accumulated

Additional

Other

Common Stock

Paid-in-

Comprehensive

Retained

Treasury Stock

Noncontrolling

Shares

Amount

Capital

Income, Net

Earnings

Shares

Amount

Interests

Total

(in thousands)

Balance at June 30, 2025

65,472

$

6,547

$

867,143

$

65,612

$

3,148,635

( 9,420

)

$

( 699,867

)

$

1,820

$

3,389,890

Issuance of stock for equity awards, net of forfeitures

( 43

)

43

Tax withholdings on equity award vesting

( 20

)

( 20

)

Amortization of share-based compensation

3,420

3,420

Treasury stock purchases

( 1,314

)

( 119,965

)

( 119,965

)

Excise taxes on treasury stock purchases

( 1,198

)

( 1,198

)

Total comprehensive income, net of taxes

( 1,624

)

92,496

242

91,114

Balance at September 30, 2025

65,472

$

6,547

$

870,520

$

63,988

$

3,241,131

( 10,734

)

$

( 821,007

)

$

2,062

$

3,363,241

Accumulated

Additional

Other

Common Stock

Paid-in-

Comprehensive

Retained

Treasury Stock

Noncontrolling

Shares

Amount

Capital

Income, Net

Earnings

Shares

Amount

Interests

Total

(in thousands)

Balance at June 30, 2024

65,472

$

6,547

$

862,258

$

35,124

$

2,845,587

( 7,520

)

$

( 488,059

)

$

1,221

$

3,262,678

Stock option exercises

316

59

3,964

4,280

Issuance of stock for equity awards, net of forfeitures

( 39

)

1

39

Tax withholdings on equity award vesting

( 1

)

( 17

)

( 17

)

Amortization of share-based compensation

3,438

3,438

Treasury stock purchases

( 483

)

( 55,806

)

( 55,806

)

Excise taxes on treasury stock purchases

( 488

)

( 488

)

Total comprehensive income, net of taxes

( 506

)

89,968

63

89,525

Balance at September 30, 2024

65,472

$

6,547

$

865,973

$

34,618

$

2,935,555

( 7,944

)

$

( 540,367

)

$

1,284

$

3,303,610

See accompanying notes to condensed financial statements.

6


KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES

CONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited)

Additional

Accumulated Other

Common Stock

Paid-in-

Comprehensive

Retained

Treasury Stock

Noncontrolling

Shares

Amount

Capital

Income, Net

Earnings

Shares

Amount

Interests

Total

(in thousands)

Balance at December 31, 2024

65,472

$

6,547

$

868,763

$

71,192

$

2,978,372

( 8,215

)

$

( 573,061

)

$

1,435

$

3,353,248

Stock option exercises

27

4

235

262

Issuance of stock for equity awards, net of forfeitures

( 12,837

)

181

12,837

Tax withholdings on equity award vesting

( 55

)

( 5,977

)

( 5,977

)

Amortization of share-based compensation

14,567

14,567

Treasury stock purchases

( 2,649

)

( 252,638

)

( 252,638

)

Excise taxes on treasury stock purchases

( 2,403

)

( 2,403

)

Total comprehensive income, net of taxes

( 7,204

)

262,759

627

256,182

Balance at September 30, 2025

65,472

$

6,547

$

870,520

$

63,988

$

3,241,131

( 10,734

)

$

( 821,007

)

$

2,062

$

3,363,241

Additional

Accumulated Other

Common Stock

Paid-in-

Comprehensive

Retained

Treasury Stock

Noncontrolling

Shares

Amount

Capital

Income, Net

Earnings

Shares

Amount

Interests

Total

(in thousands)

Balance at December 31, 2023

65,472

$

6,547

$

863,963

$

35,006

$

2,691,665

( 6,843

)

$

( 411,750

)

$

1,246

$

3,186,677

Stock option exercises

1,750

113

6,625

8,375

Issuance of stock for equity awards, net of forfeitures

( 12,577

)

208

12,577

Tax withholdings on equity award vesting

( 68

)

( 5,356

)

( 5,356

)

Amortization of share-based compensation

12,837

12,837

Treasury stock purchases

( 1,354

)

( 141,272

)

( 141,272

)

Excise taxes on treasury stock purchases

( 1,191

)

( 1,191

)

Total comprehensive income, net of taxes

( 388

)

243,890

38

243,540

Balance at September 30, 2024

65,472

$

6,547

$

865,973

$

34,618

$

2,935,555

( 7,944

)

$

( 540,367

)

$

1,284

$

3,303,610

See accompanying notes to condensed financial statements.

7


KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIES

NOTES TO CONDENSED FINANCIAL STATEMENTS
(Unaudited)

(1) Basis for Preparation of the Condensed Financial Statements

The condensed financial statements included herein have been prepared by Kirby Corporation and its consolidated subsidiaries (“Kirby” or the “Company”), without audit, pursuant to the rules and regulations of the Securities and Exchange Commission. Although the Company believes that the disclosures are adequate to make the information presented not misleading, certain information and footnote disclosures, including significant accounting policies normally included in annual financial statements, have been condensed or omitted pursuant to such rules and regulations. It is suggested that these condensed financial statements be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 . Certain reclassifications have been made to reflect the current presentation of financial information.

(2) Acquisitions

On August 7, 2025, the Company purchased two inland tank barges and one towboat from an undisclosed seller for $ 9.2 million in cash.

On March 27, 2025, the Company purchased 14 inland tank barges with a total capacity of 364,000 barrels, including four specialty barges, and four high horsepower towboats from an undisclosed seller for $ 97.3 million in cash. The 14 tank barges, including four specialty barges, transport petrochemicals and refined products on the Mississippi River System and Gulf Intracoastal Waterway. The average age of the 14 barges was 16 years.

On December 31, 2024, the Company purchased an inland tank barge from a leasing company for $ 2.7 million in cash. The Company had been leasing the barge prior to purchase .

On December 30, 2024, the Company purchased three inland tank barges from an undisclosed seller for $ 9.9 million in cash.

On May 15, 2024, the Company completed the purchase of 13 inland tank barges, with a total capacity of 347,000 barrels, and two high horsepower towboats from an undisclosed seller for $ 65.2 million in cash. The 13 tank barges, including three specialty barges, transport petrochemicals and refined products on the Mississippi River System and Gulf Intracoastal Waterway. The average age of the 13 barges was 15 years.

(3) Revenues

The following table sets forth the Company’s revenues by major source (in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Marine transportation segment:

Inland transportation

$

379,329

$

392,617

$

1,168,969

$

1,170,459

Coastal transportation

105,612

93,437

284,683

275,815

$

484,941

$

486,054

$

1,453,652

$

1,446,274

Distribution and services segment:

Commercial and industrial

$

168,079

$

162,285

$

501,913

$

470,567

Power generation

173,916

111,573

419,157

355,025

Oil and gas

44,225

71,237

137,553

191,695

$

386,220

$

345,095

$

1,058,623

$

1,017,287

Contract liabilities represent advance consideration received from customers, and are recognized as revenue over time or at a point in time as the related performance obligation is satisfied. Revenues recognized during the nine months ended September 30, 2025 and 2024 that were included in the opening contract liability balances were $ 112.8 million and $ 101.8 million , respectively. The Company presents all contract liabilities within the deferred revenues financial statement caption on the balance sheets. The Company did no t have any contract assets as of September 30, 2025 or December 31, 2024 .

8


(4) Segment Data

The Company’s operations are aggregated into two reportable business segments as follows:

Marine Transportation Segment (“KMT”) — Provides marine transportation by United States flagged vessels principally of liquid cargoes throughout the United States inland waterway system, along all three United States coasts, and to a lesser extent, in United States coastal transportation of dry-bulk cargoes. The principal products transported include petrochemicals, black oil, refined petroleum products and agricultural chemicals.

Distribution and Services Segment (“KDS”) — Provides after-market services and genuine replacement parts for engines, transmissions, reduction gears, electric motors, drives, and controls, specialized electrical distribution and control systems, and related equipment used in oilfield services, marine, power generation, on-highway, and other industrial applications. The Company also rents equipment including generators, industrial compressors, high-capacity lift trucks, construction equipment and refrigeration trailers for use in a variety of industrial markets. The Company also manufactures and remanufactures specialized equipment, including pressure pumping units, electric power generation equipment, and specialized electrical distribution and control equipment for oilfield service, railroad and other industrial customers.

The Company’s two reportable business segments are managed separately by the Company’s chief operating decision maker (“CODM” ) , its Chief Executive Officer , based on fundamental differences in their operations. The Company’s accounting policies for the business segments are the same as those described in Note 1, Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company’s 2024 Annual Report on Form 10-K. The CODM evaluates the performance of the Company’s segments based on the contributions to operating income of the respective segments, and before income taxes, interest, gains or losses on disposition of assets, other nonoperating income, noncontrolling interests, accounting changes, and nonrecurring items. The CODM uses segment operating income to allocate resources for each segment during the annual budget and forecasting process. The CODM considers budget-to-actual variances on a monthly basis for segment operating income when making decisions about allocating capital and personnel to the segments. The CODM also uses segment operating income to assess the performance for each segment by comparing the results and return on invested capital of each segment. Intersegment revenues, based on market-based pricing, of KDS from KMT of $ 5.6 million and $ 28.1 million for the three months and nine months ended September 30, 2025, respectively, and $ 5.0 million and $ 19.1 million for the three months and nine months ended September 30, 2024, respectively, as well as the related intersegment profit of $ 0.6 million and $ 2.8 million for the three months and nine months ended September 30, 2025, respectively, and $ 0.5 million and $ 1.9 million for the three months and nine months ended September 30, 2024, respectively, have been eliminated from the tables below.

The following tables set forth the Company’s revenues, depreciation and amortization, and income or loss by reportable segment and total assets (in thousands):

Three Months Ended September 30,

2025

2024

KMT

KDS

Total

KMT

KDS

Total

Revenue from external customers

$

484,941

$

386,220

$

871,161

$

486,054

$

345,095

$

831,149

Less:

Costs of sales and operating expenses

300,021

280,049

580,070

296,114

255,835

551,949

Administrative payroll expense

19,141

23,617

42,758

18,502

21,734

40,236

Taxes, other than on income

7,266

2,472

9,738

6,524

2,414

8,938

Depreciation and amortization

54,100

10,949

65,049

49,876

8,921

58,797

Other segment items (a)

15,844

26,464

42,308

15,562

25,813

41,375

Segment operating income

$

88,569

$

42,669

$

131,238

$

99,476

$

30,378

$

129,854

Reconciliation of segment operating income

Unallocated amounts:

General corporate expenses

( 5,021

)

( 4,541

)

Gain on disposition of assets

3,002

1,617

Operating income

$

129,219

$

126,930

Other income

5,557

2,949

Interest expense

( 11,838

)

( 12,498

)

Earnings before taxes on income

$

122,938

$

117,381

9


Nine Months Ended September 30,

2025

2024

KMT

KDS

Total

KMT

KDS

Total

Revenue from external customers

$

1,453,652

$

1,058,623

$

2,512,275

$

1,446,274

$

1,017,287

$

2,463,561

Less:

Costs of sales and operating expenses

889,797

766,608

1,656,405

897,351

758,980

1,656,331

Administrative payroll expense

58,749

71,759

130,508

57,778

66,841

124,619

Taxes, other than on income

21,842

7,216

29,058

21,104

6,142

27,246

Depreciation and amortization

158,954

31,950

190,904

146,772

25,350

172,122

Other segment items (a)

50,105

80,395

130,500

45,934

78,146

124,080

Segment operating income

$

274,205

$

100,695

$

374,900

$

277,335

$

81,828

$

359,163

Reconciliation of segment operating income

Unallocated amounts:

General corporate expenses

( 13,048

)

( 12,418

)

Gain on disposition of assets

4,759

2,206

Operating income

$

366,611

$

348,951

Other income

15,703

9,306

Interest expense

( 35,105

)

( 38,468

)

Earnings before taxes on income

$

347,209

$

319,789

(a)
Other segment items for each reportable segment includes:

KMT selling expense, professional service expense, occupancy expense, and certain overhead expenses.

KDS inventory-related expense, warranty expense, selling expense, professional service expense, occupancy expense, and certain overhead expenses.

September 30,
2025

December 31,
2024

Total assets:

Marine transportation

$

4,707,146

$

4,578,616

Distribution and services

1,182,524

1,115,781

Other

173,889

157,555

$

6,063,559

$

5,851,952

The following table presents the details of “Other” total assets (in thousands):

September 30,
2025

December 31,
2024

General corporate assets

$

171,050

$

154,655

Investment in affiliates

2,839

2,900

$

173,889

$

157,555

(5) Long-Term Debt

The following table presents the carrying value and fair value (determined using inputs characteristic of a Level 2 fair value measurement) of debt outstanding (in thousands):

September 30, 2025

December 31, 2024

Carrying Value

Fair Value

Carrying Value

Fair Value

Revolving Credit Facility due July 29, 2027 (a)

$

175,000

$

175,000

$

$

Term Loan due July 29, 2027 (a)

70,000

70,000

70,000

70,000

4.2 % senior notes due March 1, 2028

500,000

500,140

500,000

491,923

3.46 % senior notes due January 19, 2033

60,000

54,374

60,000

52,956

3.51 % senior notes due January 19, 2033

240,000

218,241

240,000

212,650

Credit line due June 30, 2026

Bank notes payable

7,283

7,283

8,226

8,226

1,052,283

1,025,038

878,226

835,755

Unamortized debt discounts and issuance costs

( 3,368

)

( 3,278

)

$

1,048,915

$

1,025,038

$

874,948

$

835,755

(a)
Variable interest rate o f 5.3 % at September 30, 2025 and 5.6 % at December 31, 2024 .

10


On July 29, 2022, the Company entered into a credit agreement (the “2027 Credit Agreement”) with a group of commercial banks, with JPMorgan Chase Bank, N.A. as the administrative agent bank that allows for a $ 500 million unsecured revolving credit facility (the “2027 Revolving Credit Facility”) and a $ 250 million unsecured term loan (the “2027 Term Loan”) with a maturity date of July 29, 2027 . In the fourth quarter of 2022, the Company repaid $ 80 million under the 2027 Term Loan prior to scheduled maturities. In the fourth quarter of 2024, the Company repaid $ 100 million under the 2027 Term Loan prior to scheduled maturities. As a result, no repayments are required until March 31, 2027. Future repayments under the 2027 Term Loan are excluded from short term liabilities because the Company intends to use availability under the 2027 Revolving Credit Facility to repay these amounts upon maturity. Outstanding letters of credit under the 2027 Revolving Credit Facility were $ 6,000 and available borrowing capacity was $ 325.0 million as of September 30, 2025.

On February 3, 2022, the Company entered into a note purchase agreement for the issuance of $ 300 million of unsecured senior notes with a group of institutional investors, consisting of $ 60 million of 3.46 % series A notes (“Series A Notes”) and $ 240 million of 3.51 % series B notes (“Series B Notes ”), each due January 19, 2033 (collectively, the “2033 Notes”). The Series A Notes were issued on October 20, 2022, and the Series B Notes were issued on January 19, 2023. No principal payments will be required until maturity.

The Company has a $ 15 million line of credit (“Credit Line”) with Bank of America, N.A. (“Bank of America”) for short-term liquidity needs and letters of credit, with a maturity date of June 30, 2026 . Outstanding letters of credit under the Credit Line were $ 6.8 million and available borrowing capacity was $ 8.2 million as of September 30, 2025 .

(6) Leases

The Company currently leases various facilities and equipment under cancelable and noncancelable operating leases. The accounting for the Company’s leases may require judgments, which include determining whether a contract contains a lease, allocating the consideration between lease and non-lease components, and determining the incremental borrowing rates. Leases with an initial noncancelable term of 12 months or less are not recorded on the balance sheet and related lease expense is recognized on a straight-line basis over the lease term. The Company has also elected to combine lease and non-lease components on all classes of leased assets, except for leased towing vessels, for which the Company estimates approximately 70 % of the costs relate to service costs and other non-lease components. Variable lease costs relate primarily to real estate executory costs (i.e. taxes, insurance and maintenance).

Future minimum lease payments under operating leases that have initial noncancelable lease terms in excess of one year were as follows (in thousands):

September 30,
2025

December 31,
2024

2025

$

13,201

$

42,202

2026

50,935

38,115

2027

40,984

30,263

2028

30,062

22,860

2029

15,709

12,483

Thereafter

94,925

76,621

Total lease payments

245,816

222,544

Less: imputed interest

( 42,233

)

( 38,647

)

Operating lease liabilities

$

203,583

$

183,897

The following table summarizes lease costs (in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Operating lease cost

$

13,093

$

11,728

$

37,036

$

34,608

Variable lease cost

68

371

( 256

)

1,442

Short-term lease cost

10,098

9,515

31,786

28,503

Sublease income

( 949

)

( 836

)

( 2,820

)

( 2,520

)

$

22,310

$

20,778

$

65,746

$

62,033

The following table summarizes other supplemental information about the Company’s operating leases:

September 30,
2025

December 31,
2024

Weighted average discount rate

4.7

%

4.6

%

Weighted average remaining lease term

8 years

8 years

11


(7) Stock Award Plans

The compensation cost that has been charged against earnings for the Company’s stock award plans and the income tax benefit recognized in the statement of earnings for stock awards were as follows (in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Compensation cost

$

3,420

$

3,438

$

14,567

$

12,837

Income tax benefit

$

847

$

786

$

3,511

$

3,042

During the nine months ended September 30, 2025, the Company grant ed 131,190 restricted stock units (“RSUs”) to selected officers and other key employees under the employee stock award plan that vest ratably over five years . During May 2025, the Company granted 15,384 shares of restricted stock to nonemployee directors of the Company under the director stock plan which vest six months after the date of grant.

(8) Taxes on Income

Earnings (loss) before taxes on income and details of the provision (benefit) for taxes on income were as follows (in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Earnings (loss) before taxes on income:

United States

$

122,673

$

117,520

$

347,634

$

320,265

Foreign

265

( 139

)

( 425

)

( 476

)

$

122,938

$

117,381

$

347,209

$

319,789

Provision (benefit) for taxes on income:

Federal:

Current

$

( 28,579

)

$

10,031

$

9,229

$

29,987

Deferred

54,486

13,547

62,970

35,825

State and local:

Current

230

2,546

6,428

7,103

Deferred

4,039

1,225

5,172

2,873

Foreign - current

24

1

24

73

$

30,200

$

27,350

$

83,823

$

75,861

On July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was signed into law. The legislation included several significant U.S. income tax provisions that will help reduce the Company’s U.S. federal cash tax payments for the remainder of 2025 and future years. These provisions include 100% bonus tax depreciation and domestic research and development cost expensing. The Company incorporated these provisions effective during the quarter, and they had no material impact on the operational results for the three and nine months ended September 30, 2025. At September 30, 2025, the Company had a federal income tax receivable of $ 39.7 million included in Accounts receivable – other on the balance sheet.

12


(9) Earnings Per Share

The following table presents the components of basic and diluted earnings per share (in thousands, except per share amounts):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Net earnings attributable to Kirby

$

92,496

$

89,968

$

262,759

$

243,890

Undistributed earnings allocated to restricted shares

( 26

)

( 24

)

( 40

)

( 36

)

Earnings available to Kirby common stockholders – basic

92,470

89,944

262,719

243,854

Undistributed earnings allocated to restricted shares

26

24

40

36

Undistributed earnings reallocated to restricted shares

( 26

)

( 23

)

( 40

)

( 35

)

Earnings available to Kirby common stockholders – diluted

$

92,470

$

89,945

$

262,719

$

243,855

Shares outstanding:

Weighted average common stock issued and outstanding

55,641

57,767

56,221

58,138

Weighted average unvested restricted stock

( 15

)

( 14

)

( 9

)

( 9

)

Weighted average common stock outstanding – basic

55,626

57,753

56,212

58,129

Dilutive effect of stock options and restricted stock units

344

433

348

397

Weighted average common stock outstanding – diluted

55,970

58,186

56,560

58,526

Net earnings per share attributable to Kirby common stockholders:

Basic

$

1.66

$

1.56

$

4.67

$

4.20

Diluted

$

1.65

$

1.55

$

4.64

$

4.17

There were no antidilutive stock options as of September 30, 2025 and 2024 . There were no antidilutive RSUs as of September 30, 2025 and 2024 .

(10) Inventories

The following table presents the details of inventories – net (in thousands):

September 30,
2025

December 31,
2024

Finished goods

$

340,415

$

328,540

Work in process

83,561

65,358

$

423,976

$

393,898

(11) Retirement Plans

The Company sponsors a defined benefit plan for certain of its inland vessel personnel and shore based tankermen. The plan benefits are based on an employee’s years of service and compensation. The plan assets consist primarily of equity and fixed income securities.

On April 12, 2017, the Company amended its pension plan to cease all benefit accruals for periods after May 31, 2017 for certain participants. Participants grandfathered and not impacted were those, as of the close of business on May 31, 2017, who either (a) had completed 15 years of pension service or (b) had attained age 50 and completed 10 years of pension service. Participants non-grandfathered are eligible to receive discretionary 401(k) plan contributions.

The Company’s pension plan funding strategy is to make annual contributions in amounts equal to or greater than amounts necessary to meet minimum government funding requirements. The plan’s benefit obligations are based on a variety of demographic and economic assumptions, and the pension plan assets’ returns are subject to various risks, including market and interest rate risk, making an accurate prediction of the pension plan contribution difficult. Based on current pension plan assets and market conditions, the Company does not expect to make a contribution to the Kirby pension plan during 2025.

13


On February 14, 2018, with the acquisition of Higman Marine, Inc. and its affiliated companies (“Higman”), the Company assumed Higman’s pension plan for its inland vessel personnel and office staff. On March 27, 2018, the Company amended the Higman pension plan to close it to all new entrants and cease all benefit accruals for periods after May 15, 2018 for all participants. The Company made contributions of $ 1.0 million to the Higman pension plan during the nine months ended September 30, 2025 . The Company expects to make additional contributions of $ 0.2 million during the remainder of 2025.

The Company sponsors an unfunded defined benefit health care plan that provides limited postretirement medical benefits to employees who meet minimum age and service requirements, and to eligible dependents. The plan is contributory, with retiree contributions adjusted annually. The plan eliminated coverage for future retirees as of December 31, 2011. The Company also has an unfunded defined benefit supplemental executive retirement plan (“SERP”) that was assumed in an acquisition in 1999. That plan ceased to accrue additional benefits effective January 1, 2000.

The components of net periodic benefit cost for the Company’s defined benefit plans were as follows (in thousands):

Pension Benefits

Pension Plans

SERP

Three Months Ended September 30,

Three Months Ended September 30,

2025

2024

2025

2024

Components of net periodic benefit cost:

Service cost

$

742

$

850

$

$

Interest cost

4,547

4,294

10

10

Expected return on plan assets

( 6,811

)

( 6,221

)

Amortization of actuarial (gain) loss

( 2,250

)

( 584

)

7

8

Net periodic benefit cost

$

( 3,772

)

$

( 1,661

)

$

17

$

18

Pension Benefits

Pension Plans

SERP

Nine Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Components of net periodic benefit cost:

Service cost

$

2,225

$

2,547

$

$

Interest cost

13,642

12,884

30

29

Expected return on plan assets

( 20,432

)

( 18,663

)

Amortization of actuarial (gain) loss

( 6,751

)

( 1,748

)

21

24

Net periodic benefit cost

$

( 11,316

)

$

( 4,980

)

$

51

$

53

The components of net periodic benefit cost for the Company’s postretirement benefit plan were as follows (in thousands):

Other Postretirement Benefits

Postretirement Welfare Plan

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Components of net periodic benefit cost:

Interest cost

$

5

$

5

$

16

$

15

Amortization of actuarial gain

( 67

)

( 70

)

( 198

)

( 210

)

Net periodic benefit cost

$

( 62

)

$

( 65

)

$

( 182

)

$

( 195

)

(12) Other Comprehensive Income

The Company’s changes in other comprehensive loss were as follows (in thousands):

Three Months Ended September 30,

2025

2024

Gross
Amount

Income Tax Benefit

Net Amount

Gross
Amount

Income Tax Benefit

Net
Amount

Pension and postretirement benefits (a):

Amortization of net actuarial gain

$

( 2,310

)

$

578

$

( 1,732

)

$

( 646

)

$

162

$

( 484

)

Foreign currency translation

108

108

( 22

)

( 22

)

Total

$

( 2,202

)

$

578

$

( 1,624

)

$

( 668

)

$

162

$

( 506

)

14


Nine Months Ended September 30,

2025

2024

Gross
Amount

Income Tax Benefit

Net Amount

Gross
Amount

Income Tax (Provision) Benefit

Net
Amount

Pension and postretirement benefits (a):

Amortization of net actuarial gain

$

( 6,928

)

$

1,736

$

( 5,192

)

$

( 1,934

)

$

491

$

( 1,443

)

Actuarial gains (losses)

( 3,477

)

871

( 2,606

)

2,069

( 519

)

1,550

Foreign currency translation

594

594

( 495

)

( 495

)

Total

$

( 9,811

)

$

2,607

$

( 7,204

)

$

( 360

)

$

( 28

)

$

( 388

)

(a) Actuarial gains (losses) are amortized into other income (expense). ( See Note 11, Retirement Plans)

(13) Contingencies and Commitments

On October 13, 2016, the tug Nathan E. Stewart and barge DBL 55, an articulated tank barge and tugboat unit (“ATB”) owned and operated by Kirby Offshore Marine, LLC, a wholly owned subsidiary of the Company, ran aground at the entrance to Seaforth Channel on Atholone Island, British Columbia. The grounding resulted in a breach of a portion of the Nathan E. Stewart’s fuel tanks causing a discharge of diesel fuel into the water. The United States Coast Guard and the National Transportation Safety Board designated the Company as a party of interest in their investigation as to the cause of the incident. The Canadian authorities including Transport Canada and the Canadian Transportation Safety Board investigated the cause of the incident. On October 10, 2018, the Heiltsuk First Nation filed a civil action in the British Columbia Supreme Court against a subsidiary of the Company, the master and pilot of the tug, the vessels and the Canadian government seeking unquantified damages as a result of the incident. On May 1, 2019, the Company filed a limitation action in the Federal Court of Canada seeking limitation of liability relating to the incident as provided under admiralty law. The Heiltsuk First Nation’s civil claim has been consolidated into the Federal Court limitation action as of July 26, 2019 and it is expected that the Federal Court of Canada will decide all claims against the Company. The Company is unable to estimate the potential exposure in the civil proceeding. The Company has various insurance policies covering liabilities including pollution, property, marine and general liability and believes that it has satisfactory insurance coverage for the cost of cleanup and salvage operations as well as other potential liabilities arising from the incident. The Company believes its accrual of such estimated liability is adequate for the incident and does not expect the incident to have a material adverse effect on its business or financial condition.

In addition, the Company is involved in various legal and other proceedings which are incidental to the conduct of its business, none of which in the opinion of management will have a material effect on the Company’s financial condition, results of operations, or cash flows. Management believes its accrual of such estimated liability is adequate and believes that it has adequate insurance coverage or has meritorious defenses for these other claims and contingencies.

The Company has issued guaranties or obtained standby letters of credit and performance bonds supporting performance by the Company and its subsidiaries of contractual or contingent legal obligations of the Company and its subsidiaries incurred in the ordinary course of business. The aggregate notional value of these instruments is $ 30.5 million at September 30, 2025, including $ 11.6 million in letters of credit and $ 18.9 million in performance bonds. All of these instruments have an expiration date within approximately two years . The Company does not believe demand for payment under these instruments is likely and expects no material cash outlays to occur regarding these instruments.

15


Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Statements contained in this Form 10-Q that are not historical facts, including, but not limited to, any projections contained herein, are forward-looking statements and involve a number of risks and uncertainties. Such statements involve risks and uncertainties. Such statements can be identified by the use of forward-looking terminology such as “may,” “will,” “expect,” “anticipate,” “estimate,” or “continue,” or the negative thereof or other variations thereon or comparable terminology. The actual results of the future events described in such forward-looking statements in this Form 10-Q could differ materially from those stated in such forward-looking statements. Among the factors that could cause actual results to differ materially are: adverse economic conditions, industry competition and other competitive factors, adverse weather conditions such as high water, low water, tropical storms, hurricanes, tsunamis, fog and ice, tornados, COVID-19 or other pandemics, marine accidents, lock delays or closures, fuel costs, interest rates, construction of new equipment by competitors, government and environmental laws and regulations, and the timing, magnitude and number of acquisitions made by the Company. For a more detailed discussion of factors that could cause actual results to differ from those presented in forward-looking statements, see Item 1A-Risk Factors found in the Company’s Annual Report on Form 10‑K for the year ended December 31, 2024. Forward-looking statements are based on currently available information and the Company assumes no obligation to update any such statements. For purposes of Management’s Discussion, all net earnings per share attributable to Kirby common stockholders are “diluted earnings per share.”

Overview

The Company is the nation’s largest domestic tank barge operator transporting bulk liquid products throughout the Mississippi River System, on the Gulf Intracoastal Waterway, and coastwise along all three United States coasts. The Company transports petrochemicals, black oil, refined petroleum products and agricultural chemicals by tank barge. In addition, the Company participates in the transportation of dry-bulk commodities in United States coastwise trade. Through KDS, the Company provides after-market services and genuine replacement parts for engines, transmissions, reduction gears, electric motors, drives, and controls, specialized electrical distribution and control systems, and related equipment used in oilfield services, marine, power generation, on-highway, and other industrial applications. The Company also rents equipment including generators, industrial compressors, high-capacity lift trucks, construction equipment and refrigeration trailers for use in a variety of industrial markets. The Company also manufactures and remanufactures specialized equipment, including pressure pumping units, electric power generation equipment, and specialized electrical distribution and control equipment for oilfield service, railroad and other industrial customers.

The following table summarizes key operating results of the Company (in thousands, except per share amounts):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Total revenues

$

871,161

$

831,149

$

2,512,275

$

2,463,561

Net earnings attributable to Kirby

$

92,496

$

89,968

$

262,759

$

243,890

Net earnings per share attributable to Kirby common stockholders – diluted

$

1.65

$

1.55

$

4.64

$

4.17

Net cash provided by operating activities

$

357,994

$

509,110

Capital expenditures

$

217,440

$

245,990

Cash provided by operating activities for the 2025 first nine months decreased in comparison to the 2024 first nine months primarily due to unfavorable working capital changes driven by the timing of accounts receivable collections, accounts payable payments and federal income tax payments, as well as an increase in inventories in the first nine months of 2025, partially offset by increased net earnings. The increase in inventories was due to the impact of higher business activity levels and supply delays in KDS resulting in the buildup of inventory for projects, mainly due to power generation orders, which are scheduled to be delivered later in 2025 and into 2026. For the 2025 first nine months, capital expenditures of $217.4 million included $186.5 million in KMT and $30.9 million in KDS and corporate, each more fully described under Cash Flow and Capital Expenditures below.

The Company projects that capital expenditures for 2025 will be in the $260 million to $290 million range. Approximately $180 million to $210 million is associated with marine maintenance capital and improvements to existing inland and coastal marine equipment, and facility improvements. Up to approximately $80 million is associated with growth capital spending in both segments.

The Company’s debt-to-capitalization ratio increased to 23.8% at September 30, 2025 compared to 20.7% at December 31, 2024, primarily due to an increase in debt outstanding. Total equity at September 30, 2025 increased as compared to December 31, 2024 primarily from net earnings attributable to Kirby of $262.8 million, partially offset by treasury stock purchases of $252.6 million. The Company’s debt outstanding as of September 30, 2025 and December 31, 2024 is detailed in Long-Term Financing below.

16


Marine Transportation

For the 2025 third quarter and first nine months, KMT generated 56% and 58%, respectively, of the Company’s revenues compared to 58% and 59% for the 2024 third quarter and first nine months, respectively. The segment’s customers include many of the major petrochemical and refining companies that operate in the United States. Products transported include intermediate materials used to produce many of the end products used widely by businesses and consumers — plastics, fiber, paints, detergents, oil additives and paper, among others, as well as residual fuel oil, ship bunkers, asphalt, gasoline, diesel fuel, heating oil, crude oil, natural gas condensate, and agricultural chemicals. Consequently, KMT is directly affected by the volumes produced by the Company’s petroleum, petrochemical, and refining customer base.

The following table summarizes the Company’s marine transportation fleet:

September 30,

2025

2024

Inland tank barges:

Owned

1,073

1,062

Leased

32

33

Total

1,105

1,095

Barrel capacity (in millions)

24.5

24.2

Active inland towboats (quarter average):

Owned

209

216

Chartered

61

71

Total

270

287

Coastal tank barges:

Owned

28

28

Leased

-

-

Total

28

28

Barrel capacity (in millions)

2.9

2.9

Coastal tugboats:

Owned

23

24

Chartered

1

1

Total

24

25

Offshore dry-bulk cargo barges (owned)

2

4

Offshore tugboats and docking tugboat (owned and chartered)

3

4

The Company also owns shifting operations and fleeting facilities for dry cargo barges and tank barges in the Houston Ship Channel and in Freeport and Port Arthur, Texas, and Lake Charles, Louisiana and a shipyard for building towboats and performing routine maintenance near the Houston Ship Channel. Furthermore, the Company owns a two-thirds interest in Osprey Line, L.L.C., which transports project cargoes and cargo containers by barge.

During the 2025 first nine months, the Company purchased 16 inland tank barges, brought back into service three inland tank barges, and retired eight inland tank barges, increasing its capacity by approximately 0.3 million barrels.

KMT revenues for both the 2025 third quarter and first nine months were flat, and operating income decreased 11% and 1%, respectively, compared to the 2024 third quarter and first nine months. Revenues for the 2025 first nine months were up 1% compared to the 2024 first nine months as higher spot and term pricing in the inland market over the 2025 first six months and higher term pricing in the coastal market for the 2025 first nine months were offset by lower fuel rebills in both inland and coastal markets. Revenues for the 2025 third quarter were flat as compared to the 2024 third quarter as lower barge utilization and moderating spot market pricing seen in the 2025 third quarter in the inland market were offset by higher term pricing in the coastal market. The decrease in operating income for the 2025 third quarter and first nine months was primarily due to lower barge utilization and moderating spot market prices in the third quarter in the inland market, partially offset by higher term pricing in the coastal market. The 2025 and 2024 first quarters were impacted by poor operating conditions including seasonal wind and fog along the Gulf Coast and various lock closures. For the 2025 third quarter and first nine months, the inland tank barge fleet contributed 78% and 80%, respectively, and the coastal fleet contributed 22% and 20% of KMT revenues, respectively. For both the 2024 third quarter and first nine months, the inland tank barge fleet contributed 81% and the coastal fleet contributed 19% of KMT revenues.

17


Inland tank barge utilization levels averaged in the low to mid-90% range during the 2025 and 2024 first and second quarters, the mid-80% range during the 2025 third quarter, and the 90% range during the 2024 third quarter. The 2025 third quarter experienced seasonally favorable weather and improved navigational conditions. In addition, the 2025 third quarter was also impacted by a lighter feedstock mix for refinery and chemical customers and fewer barges undergoing maintenance across the industry. The 2025 and 2024 first quarters were impacted by high winds and heavy fog along the Gulf Coast and lock delays. The 2024 second and third quarters were modestly impacted by weather and lock closures. Coastal tank barge utilization levels averaged in the mid to high 90% range during the 2025 and 2024 first, second, and third quarters.

During both the 2025 third quarter and first nine months, approximately 70% of KMT inland revenues were under term contracts and 30% were spot contract revenues. During both the 2024 third quarter and first nine months, approximately 65% of KMT inland revenues were under term contracts and 35% were spot contract revenues. Inland time charters during the 2025 third quarter and first nine months represented approximately 57% and 59%, respectively, of inland revenues under term contracts compared with 62% and 61% in the 2024 third quarter and first nine months, respectively. During both the 2025 third quarter and first nine months, approximately 100% of KMT coastal revenues were under term contracts and none were under spot contracts. During the 2024 third quarter and first nine months, approximately 99% and 98%, respectively, of KMT coastal revenues were under term contracts and 1% and 2%, respectively, were under spot contracts. Coastal time charters represented approximately 100% of coastal revenues under term contracts during both the 2025 third quarter and first nine months compared to 99% and 98% during the 2024 third quarter and first nine months, respectively. Term contracts have contract terms of 12 months or longer, while spot contracts have contract terms of less than 12 months.

The following table summarizes the average range of pricing changes in term and spot contracts renewed during 2025 compared to contracts renewed during the corresponding quarter of 2024:

Three Months Ended

March 31, 2025

June 30, 2025

September 30, 2025

Inland market:

Term increase

3% – 5%

2% – 4%

0% – 2%

Spot increase

6% – 8%

6% – 8%

(2)% – (4)%

Coastal market (a):

Term increase

24% – 26%

24% – 26%

14% – 16%

(a)
Term contract pricing in the coastal market is contingent on various factors including geographic location, vessel capacity, vessel type, and product serviced.

Effective January 1, 2025, annual escalators for labor and the producer price index on a number of inland multi-year contracts resulted in rate increases on those contracts in the 3% to 5% range, excluding fuel.

KMT operating margin was 18.3% and 18.9% for the 2025 third quarter and first nine months, respectively, compared to 20.5% and 19.2% for the 2024 third quarter and first nine months, respectively.

Distribution and Services

The Company, through KDS, provides after-market services and genuine replacement parts for engines, transmissions, reduction gears, electric motors, drives, and controls, specialized electrical distribution and control systems, and related equipment used in oilfield services, marine, power generation, on-highway, and other industrial applications. The Company also rents equipment including generators, industrial compressors, high-capacity lift trucks, construction equipment and refrigeration trailers for use in a variety of industrial markets. The Company also manufactures and remanufactures specialized equipment, including pressure pumping units, electric power generation equipment, and specialized electrical distribution and control equipment for oilfield service, railroad and other industrial customers.

For the 2025 third quarter and first nine months, KDS generated 44% and 42% of the Company’s revenues, respectively, of which 79% and 84%, respectively, were generated from service and parts and 21% and 16%, respectively, from manufacturing. The results of KDS are largely influenced by the economic cycles of the oil and gas, marine, power generation, on-highway, and other related industrial markets.

KDS revenues for the 2025 third quarter and first nine months increased 12% and 4%, respectively, compared with the 2024 third quarter and first nine months. KDS operating income for the 2025 third quarter and first nine months increased 40% and 23%, respectively, compared with the 2024 third quarter and first nine months. In the commercial and industrial market, revenues and operating income increased compared to the 2024 third quarter and first nine months due to higher business levels in marine repair. For the 2025 third quarter and first nine months, the commercial and industrial market contributed 44% and 47% of KDS revenues, respectively.

18


In the power generation market, revenues and operating income increased compared to the 2024 third quarter and first nine months due to increased demand for backup and critical power applications. For the 2025 third quarter and first nine months, the power generation market contributed 45% and 40% of KDS revenues, respectively.

In the oil and gas market, revenues decreased compared to the 2024 third quarter and first nine months, impacted by lower levels of conventional oilfield activity which resulted in decreased demand for new transmissions and parts, partially offset by deliveries of electric fracturing equipment. Operating income in the oil and gas market increased compared to the 2024 third quarter and first nine months due to product mix and ongoing cost management initiatives. For the 2025 third quarter and first nine months, the oil and gas market contributed 11% and 13% of KDS revenues, respectively.

KDS operating margin was 11.0% and 9.5% for the 2025 third quarter and first nine months, respectively, compared to 8.8% and 8.0% for the 2024 third quarter and first nine months, respectively.

Outlook

Overall, the Company expects to deliver improved financial results in 2025. In KMT, the Company expects barge utilization rates in the 2025 fourth quarter to improve over the 2025 third quarter. The coastal marine market conditions remain very favorable. In KDS, growth in the power generation market is expected to offset softness in oil and gas markets, and the on-highway service and repair business continues to modestly improve despite the ongoing trucking recession. The Company remains mindful of the ever-changing economic landscape related to the possible impact of high interest rates, tariffs and possible recessionary headwinds as it moves through the 2025 fourth quarter and into 2026.

In the inland marine transportation market for the remainder of 2025, the Company continues to see inflationary pressures persisting which continue to drive up operating costs. These continuing cost pressures, along with limited new barge construction and the increasing cost of equipment, should continue to put upward pressure on prices over the long-term. In the near term, however, term and spot market pricing could face headwinds if short-term market softness experienced in the 2025 third quarter re-emerges. In the coastal marine transportation market in 2025, market conditions remain very favorable with steady customer demand. This is expected to keep barge utilization at high levels with improved rates as the availability of equipment is limited across the industry given there are currently no new ATBs under construction.

The Company expects improved results in KDS in 2025 driven by increased orders in the power generation market, partially offset by near-term volatility from supply issues, customers deferring maintenance, and lower overall levels of activity in the oil and gas market. In commercial and industrial, the demand outlook in marine repair remains steady while on-highway service and repair remains soft but has shown some recent modest improvement. In power generation, the Company anticipates continued strong growth in orders as data center demand and the need for backup power continues to be strong. In oil and gas, the Company expects revenues to be down as the transition from conventional diesel hydraulic fracturing to electric hydraulic fracturing continues to take place. The Company anticipates extended lead times and supply delays for certain original equipment manufacturer products to continue in the 2025 fourth quarter and into 2026.

Acquisitions

On August 7, 2025, the Company purchased two inland tank barges and one towboat from an undisclosed seller for $9.2 million in cash.

On March 27, 2025, the Company purchased 14 inland tank barges with a total capacity of 364,000 barrels, including four specialty barges, and four high horsepower towboats from an undisclosed seller for $97.3 million in cash. The 14 tank barges, including four specialty barges, transport petrochemicals and refined products on the Mississippi River System and Gulf Intracoastal Waterway. The average age of the 14 barges was 16 years.

On December 31, 2024, the Company purchased an inland tank barge from a leasing company for $2.7 million in cash. The Company had been leasing the barge prior to purchase.

On December 30, 2024, the Company purchased three inland tank barges from an undisclosed seller for $9.9 million in cash.

On May 15, 2024, the Company completed the purchase of 13 inland tank barges, with a total capacity of 347,000 barrels, and two high horsepower towboats from an undisclosed seller for $65.2 million in cash. The 13 tank barges, including three specialty barges, transport petrochemicals and refined products on the Mississippi River System and Gulf Intracoastal Waterway. The average age of the 13 barges was 15 years.

Financing of these purchases was through borrowings under the Company’s 2027 Revolving Credit Facility and cash provided by operating activities.

19


Results of Operations

The following table sets forth the Company’s KMT and KDS revenues and the percentage of each to total revenues (dollars in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

%

2024

%

2025

%

2024

%

Marine transportation

$

484,941

56

%

$

486,054

58

%

$

1,453,652

58

%

$

1,446,274

59

%

Distribution and services

386,220

44

345,095

42

1,058,623

42

1,017,287

41

$

871,161

100

%

$

831,149

100

%

$

2,512,275

100

%

$

2,463,561

100

%

Marine Transportation

The following table sets forth KMT revenues, costs and expenses, operating income, and operating margin (dollars in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

% Change

2025

2024

% Change

Marine transportation revenues

$

484,941

$

486,054

$

1,453,652

$

1,446,274

1

%

Costs and expenses:

Costs of sales and operating expenses

300,021

296,114

1

889,797

897,351

(1

)

Selling, general and administrative

34,985

34,064

3

108,854

103,712

5

Taxes, other than on income

7,266

6,524

11

21,842

21,104

3

Depreciation and amortization

54,100

49,876

8

158,954

146,772

8

396,372

386,578

3

1,179,447

1,168,939

1

Operating income

$

88,569

$

99,476

(11

)%

$

274,205

$

277,335

(1

)%

Operating margins

18.3

%

20.5

%

18.9

%

19.2

%

Marine Transportation Revenues

The following table shows the marine transportation markets serviced by the Company, KMT revenue distribution, products moved and the drivers of the demand for the products the Company transports:

Markets
Serviced

2025 Third Quarter
Revenue
Distribution

2025 Nine Months
Revenue
Distribution

Products Moved

Drivers

Petrochemicals

48%

49%

Benzene, Styrene, Methanol, Acrylonitrile, Xylene, Naphtha, Caustic Soda, Butadiene, Propylene

Consumer non-durables – 70%, Consumer durables – 30%

Black Oil

25%

26%

Residual Fuel Oil, Coker Feedstock, Vacuum Gas Oil, Asphalt, Carbon Black Feedstock, Crude Oil, Natural Gas Condensate, Ship Bunkers

Fuel for Power Plants and Ships, Feedstock for Refineries, Road Construction

Refined Petroleum Products

24%

22%

Gasoline, No. 2 Oil, Jet Fuel, Heating Oil, Diesel Fuel, Ethanol

Vehicle Usage, Air Travel, Weather Conditions, Refinery Utilization

Agricultural Chemicals

3%

3%

Anhydrous Ammonia, Nitrogen – Based Liquid Fertilizer, Industrial Ammonia

Corn, Cotton and Wheat Production, Chemical Feedstock Usage

KMT revenues for both the 2025 third quarter and first nine months were flat, and operating income decreased 11% and 1%, respectively, compared to the 2024 third quarter and first nine months. Revenues for the 2025 first nine months were up 1% compared to the 2024 first nine months as higher spot and term pricing in the inland market over the 2025 first six months and higher term pricing in the coastal market for the 2025 first nine months were offset by lower fuel rebills in both inland and coastal markets. Revenues for

20


the 2025 third quarter were flat as compared to the 2024 third quarter as lower barge utilization and moderating spot market pricing seen in the 2025 third quarter in the inland market were offset by higher term pricing in the coastal market. The decrease in operating income for the 2025 third quarter and first nine months was primarily due to lower barge utilization and moderating spot market prices in the third quarter in the inland market, partially offset by higher term pricing in the coastal market. The 2025 and 2024 first quarters were impacted by poor operating conditions including seasonal wind and fog along the Gulf Coast and various lock closures. For the 2025 third quarter and first nine months, the inland tank barge fleet contributed 78% and 80%, respectively, and the coastal fleet contributed 22% and 20% of KMT revenues, respectively. For both the 2024 third quarter and first nine months, the inland tank barge fleet contributed 81% and the coastal fleet contributed 19% of KMT revenues.

Inland tank barge utilization levels averaged in the low to mid-90% range during the 2025 and 2024 first and second quarters, the mid-80% range during the 2025 third quarter, and the 90% range during the 2024 third quarter. The 2025 third quarter experienced seasonally favorable weather and improved navigational conditions. In addition, the 2025 third quarter was also impacted by a lighter feedstock mix for refinery and chemical customers and fewer barges undergoing maintenance across the industry. The 2025 and 2024 first quarters were impacted by high winds and heavy fog along the Gulf Coast and lock delays. The 2024 second and third quarters were modestly impacted by weather and lock closures. Coastal tank barge utilization levels averaged in the mid to high 90% range during the 2025 and 2024 first, second, and third quarters.

The petrochemical market, which is the Company’s largest market, contributed 48% and 49% of KMT revenues for the 2025 third quarter and first nine months, respectively, reflecting steady rates, volumes and utilization from Gulf Coast petrochemical plants as compared to the 2024 third quarter and first nine months.

The black oil market, which contributed 25% and 26% of KMT revenues for the 2025 third quarter and first nine months, respectively, reflected stable demand as refinery utilization and production levels of refined petroleum products and fuel oils increased. During the 2025 first nine months, the Company transported crude oil and natural gas condensate produced from major U.S. shale basins along the Gulf Intracoastal Waterway with inland vessels and in the Gulf of America with coastal equipment. Additionally, the Company transported volumes of Utica natural gas condensate downriver from the Mid-Atlantic to the Gulf Coast.

The refined petroleum products market, which contributed 24% and 22% of KMT revenues for the 2025 third quarter and first nine months, respectively, reflected stable volumes in the inland market with steady refinery utilization and product levels as compared to the 2024 third quarter and first nine months.

The agricultural chemical market, which contributed 3% of KMT revenues for both the 2025 third quarter and first nine months reflected stable demand for transportation of both domestically produced and imported products as compared to the 2024 third quarter and first nine months.

For the 2025 third quarter, inland operations incurred 1,442 delay days, 30% fewer than the 2,061 delay days that occurred during the 2024 third quarter. For the 2025 first nine months, inland operations incurred 8,791 delay days, 1% fewer than the 8,902 delay days that occurred during the 2024 first nine months. Delay days measure the lost time incurred by a tow (towboat and one or more tank barges) during transit when the tow is stopped due to weather, lock conditions, or other navigational factors. Delay days reflected very favorable seasonal weather and improved navigational conditions in the 2025 third quarter, and poor operating conditions due to heavy wind and fog along the Gulf Coast and lock delays during the 2025 and 2024 first quarters.

During both the 2025 third quarter and first nine months, approximately 70% of KMT inland revenues were under term contracts and 30% were spot contract revenues. During both the 2024 third quarter and first nine months, approximately 65% of KMT inland revenues were under term contracts and 35% were spot contract revenues. Inland time charters during the 2025 third quarter and first nine months represented approximately 57% and 59%, respectively, of inland revenues under term contracts compared with 62% and 61% in the 2024 third quarter and first nine months, respectively. During both the 2025 third quarter and first nine months, approximately 100% of KMT coastal revenues were under term contracts and none were under spot contracts. During the 2024 third quarter and first nine months, approximately 99% and 98%, respectively, of KMT coastal revenues were under term contracts and 1% and 2%, respectively, were under spot contracts. Coastal time charters represented approximately 100% of coastal revenues under term contracts during both the 2025 third quarter and first nine months compared to 99% and 98% during the 2024 third quarter and first nine months, respectively. Term contracts have contract terms of 12 months or longer, while spot contracts have contract terms of less than 12 months.

21


The following table summarizes the average range of pricing changes in term and spot contracts renewed during 2025 compared to contracts renewed during the corresponding quarter of 2024:

Three Months Ended

March 31, 2025

June 30, 2025

September 30, 2025

Inland market:

Term increase

3% – 5%

2% – 4%

0% – 2%

Spot increase

6% – 8%

6% – 8%

(2)% – (4)%

Coastal market (a):

Term increase

24% – 26%

24% – 26%

14% – 16%

(a)
Term contract pricing in the coastal market is contingent on various factors including geographic location, vessel capacity, vessel type, and product serviced.

Effective January 1, 2025, annual escalators for labor and the producer price index on a number of inland multi-year contracts resulted in rate increases on those contracts in the 3% to 5% range, excluding fuel.

Marine Transportation Costs and Expenses

Costs and expenses for both the 2025 third quarter and first nine months increased 3% and 1%, respectively, compared to the 2024 third quarter and first nine months. Costs of sales and operating expenses for the 2025 third quarter and first nine months were flat compared with the 2024 third quarter and first nine months. The results for the 2025 third quarter and first nine months were driven by inflationary cost pressures including wage increases that went into effect on July 1, 2025. Fuel costs were slightly higher in the 2025 third quarter as compared to the 2024 third quarter but lower in the 2025 first nine months as compared to the 2024 first nine months.

The inland marine transportation fleet operated an average of 270 towboats during the 2025 third quarter, of which an average of 61 were chartered, compared to 287 during the 2024 third quarter, of which an average of 71 were chartered. The Company charters in or releases chartered towboats in an effort to balance horsepower needs with current requirements, taking into account variability in demand or anticipated demand, addition or removal of tank barges from the fleet, chartered towboat availability, and weather or water conditions. The Company has historically used chartered towboats for approximately one-fourth of its horsepower requirements.

During the 2025 third quarter, inland operations consumed 12.5 million gallons of diesel fuel compared to 11.3 million gallons consumed during the 2024 third quarter. The average price per gallon of diesel fuel consumed during the 2025 third quarter was $2.46 per gallon compared with $2.65 per gallon for the 2024 third quarter. During the 2025 first nine months, inland operations consumed 37.0 million gallons of diesel fuel compared to 35.3 million gallons consumed during the 2024 first nine months. The average price per gallon of diesel fuel consumed during the 2025 first nine months was $2.46 per gallon compared with $2.77 per gallon for the 2024 first nine months. Fuel escalation and de-escalation clauses are typically included in term contracts and are designed to rebate fuel costs when prices decline and recover additional fuel costs when fuel prices rise; however, there is generally a 30 to 120 day delay before contracts are adjusted. Spot contracts do not have escalators for fuel.

Selling, general and administrative expenses for the 2025 third quarter and first nine months increased 3% and 5%, respectively, compared to the 2024 third quarter and first nine months. The increase in selling, general and administrative expenses for the 2025 third quarter and first nine months as compared to the 2024 third quarter and first nine months was primarily due to continued inflationary cost pressures, including higher medical costs, and salary and wage increases that went into effect on July 1, 2025. The 2025 first nine months was also impacted by an increase in the provision for credit losses related to a certain customer during the 2025 first quarter.

Depreciation and amortization for both the 2025 third quarter and first nine months increased 8% compared to the 2024 third quarter and first nine months. The increase was primarily due to capital additions during 2024 and the first nine months of 2025, as well as equipment acquisitions.

Marine Transportation Operating Income and Operating Margin

KMT operating income for the 2025 third quarter and first nine months decreased 11% and 1% compared with the 2024 third quarter and first nine months, respectively. The 2025 third quarter operating margin was 18.3% compared with 20.5% for the 2024 third quarter. The 2025 first nine months operating margin was 18.9% compared with 19.2% for the 2024 first nine months. The decrease in operating income and operating margin were primarily due to lower barge utilization and moderating spot market prices in the inland market in the 2025 third quarter, partially offset by higher term pricing in the coastal market.

22


Distribution and Services

The following table sets forth KDS revenues, costs and expenses, operating income, and operating margin (dollars in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

% Change

2025

2024

% Change

Distribution and services revenues

$

386,220

$

345,095

12

%

$

1,058,623

$

1,017,287

4

%

Costs and expenses:

Costs of sales and operating expenses

280,049

255,835

9

766,608

758,980

1

Selling, general and administrative

50,081

47,547

5

152,154

144,987

5

Taxes, other than on income

2,472

2,414

2

7,216

6,142

17

Depreciation and amortization

10,949

8,921

23

31,950

25,350

26

343,551

314,717

9

957,928

935,459

2

Operating income

$

42,669

$

30,378

40

%

$

100,695

$

81,828

23

%

Operating margins

11.0

%

8.8

%

9.5

%

8.0

%

Distribution and Services Revenues

The following table shows the markets serviced by KDS, the revenue distribution, and the customers for each market:

Markets Serviced

2025 Third Quarter
Revenue
Distribution

2025 Nine Months
Revenue
Distribution

Customers

Commercial and Industrial

44%

47%

Inland River Carriers — Dry and Liquid, Offshore Towing — Dry and Liquid, Offshore Oilfield Services — Drilling Rigs & Supply Boats, Harbor Towing, Dredging, Great Lakes Ore Carriers, Pleasure Crafts, On and Off-Highway Transportation, Pumping Stations, Mining

Power Generation

45%

40%

Power Generation & Standby Power Generation Equipment, Power Generation Rentals & Related Service, Data Centers

Oil and Gas

11%

13%

Oilfield Services, Oil and Gas Operators and Producers

KDS revenues for the 2025 third quarter and first nine months increased 12% and 4%, respectively, compared with the 2024 third quarter and first nine months. KDS operating income for the 2025 third quarter and first nine months increased 40% and 23%, respectively, compared with the 2024 third quarter and first nine months.

In the commercial and industrial market, revenues and operating income increased compared to the 2024 third quarter and first nine months due to higher business levels in marine repair. In the power generation market, revenues and operating income increased compared to the 2024 third quarter and first nine months due to increased demand for backup and critical power applications. In the oil and gas market, revenues decreased compared to the 2024 third quarter and first nine months, impacted by lower levels of conventional oilfield activity which resulted in decreased demand for new transmissions and parts, partially offset by deliveries of electric fracturing equipment. Operating income in the oil and gas market increased compared to the 2024 third quarter and first nine months due to product mix and ongoing cost management initiatives.

Distribution and Services Costs and Expenses

Costs and expenses for the 2025 third quarter and first nine months increased 9% and 2%, respectively, compared with the 2024 third quarter and first nine months. Costs of sales and operating expenses for the 2025 third quarter and first nine months increased 9% and 1%, respectively, compared with the 2024 third quarter and first nine months. The increase for the 2025 third quarter and first nine months reflected higher deliveries of power generation equipment, partially offset by lower on-highway and conventional oilfield activity.

Selling, general and administrative expenses for the 2025 third quarter and first nine months increased 5% compared to the 2024 third quarter and first nine months, reflecting higher business activity levels, inflationary cost pressures, including higher medical costs, and salary and wage increases that went into effect July 1, 2025.

23


Depreciation and amortization for the 2025 third quarter and first nine months increased 23% and 26%, respectively, compared to the 2024 third quarter and first nine months. The increase was primarily due to capital additions during 2024 and the first nine months of 2025 including additions to the equipment rental fleet.

Distribution and Services Operating Income and Operating Margin

KDS operating income for the 2025 third quarter and first nine months increased 40% and 23%, respectively, compared with the 2024 third quarter and first nine months. The 2025 third quarter operating margin was 11.0% compared to 8.8% for the 2024 third quarter. The 2025 first nine months operating margin was 9.5% compared to 8.0% for the 2024 first nine months. The results reflect increased demand in power generation from data centers and prime power customers and higher marine repair activity and deliveries of electric fracturing equipment, partially offset by lower conventional oilfield activity.

Gain on Disposition of Assets

The Company reported a net gain on disposition of assets of $3.0 million and $1.6 million for the 2025 and 2024 third quarters, respectively. The Company reported a net gain on disposition of assets of $4.8 million and $2.2 million for the 2025 and 2024 first nine months, respectively. The net gains were primarily from sales of marine transportation equipment.

Other Income and Expenses

The following table sets forth other income, noncontrolling interests, and interest expense (dollars in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

% Change

2025

2024

% Change

Other income

$

5,557

$

2,949

88

%

$

15,703

$

9,306

69

%

Noncontrolling interests

$

(242

)

$

(63

)

284

%

$

(627

)

$

(38

)

(1550

)%

Interest expense

$

(11,838

)

$

(12,498

)

(5

)%

$

(35,105

)

$

(38,468

)

(9

)%

Other Income

Other income for the 2025 and 2024 third quarters includes income of $4.6 million and $2.6 million, respectively, and the 2025 and 2024 first nine months includes income of $13.7 million and $7.7 million, respectively, for all components of net benefit costs except the service cost component related to the Company’s defined benefit plans.

Interest Expense

The following table sets forth average debt and average interest rate (dollars in thousands):

Three Months Ended September 30,

Nine Months Ended September 30,

2025

2024

2025

2024

Average debt

$

1,057,714

$

1,034,089

$

1,051,279

$

1,053,875

Average interest rate

4.5

%

4.7

%

4.5

%

4.8

%

Interest expense for the 2025 third quarter and first nine months decreased 5% and 9%, respectively, compared with the 2024 third quarter and first nine months, primarily due to a lower average interest rate in the 2025 third quarter and first nine months. Interest expense excludes capitalized interest for the 2025 third quarter and first nine months of $0.3 million and $0.8 million, respectively. There was no capitalized interest excluded from interest expense during the 2024 first nine months.

24


Financial Condition, Capital Resources and Liquidity

Balance Sheets

The following table sets forth the significant components of the balance sheets (dollars in thousands):

September 30,
2025

December 31,
2024

% Change

Assets:

Current assets

$

1,159,831

$

1,068,559

9

%

Property and equipment, net

4,122,065

4,022,966

2

Operating lease right-of-use assets

181,407

158,990

14

Goodwill

438,748

438,748

Other intangibles, net

30,956

34,406

(10

)

Other assets

130,552

128,283

2

$

6,063,559

$

5,851,952

4

%

Liabilities and stockholders’ equity:

Current liabilities

$

683,770

$

734,753

(7

)%

Long-term debt, net – less current portion

1,041,632

866,722

20

Deferred income taxes

805,006

739,472

9

Operating lease liabilities – less current portion

159,261

148,170

7

Other long-term liabilities

10,649

9,587

11

Total equity

3,363,241

3,353,248

$

6,063,559

$

5,851,952

4

%

Current assets as of September 30, 2025 increased 9% compared with December 31, 2024. Trade accounts receivable increased 7% primarily due to higher business activity levels in both KMT and KDS. Accounts receivable – other increased 105% due to a federal income tax receivable associated with the OBBBA. Inventories – net increased 8% primarily due to the impact of higher business activity levels and efforts to manage supply in KDS resulting in the buildup of inventory for mainly power generation projects that are scheduled to be delivered later in 2025 and into 2026.

Property and equipment, net of accumulated depreciation, at September 30, 2025 increased 2% compared with December 31, 2024. The increase reflected $206.9 million of capital additions (net of a decrease in accrued capital expenditures of $10.6 million) and $106.5 million of equipment acquisitions in the 2025 first nine months, partially offset by $189.7 million of depreciation expense and $24.5 million of property disposals more fully described under Cash Flow and Capital Expenditures below.

Operating lease right-of-use assets as of September 30, 2025 increased 14% compared with December 31, 2024, primarily due to new leases acquired in the 2025 first nine months, partially offset by lease amortization expense.

Other intangibles, net, as of September 30, 2025 decreased 10% compared with December 31, 2024, due to amortization during the 2025 first nine months partially offset by a $3.0 million intellectual property intangible asset acquired in the 2025 second quarter.

Other assets as of September 30, 2025 increased 2% compared with December 31, 2024, primarily due to additional deferred major maintenance drydock expenditures incurred during the 2025 first nine months, partially offset by amortization of drydock expenditures.

Current liabilities as of September 30, 2025 decreased 7% compared with December 31, 2024. Income taxes payable decreased 98% primarily due to timing of federal income tax payments. Accrued liabilities decreased 7% primarily from payment during the 2025 first nine months of employee incentive compensation accrued during 2024.

Long-term debt, net – less current portion, as of September 30, 2025 increased 20% compared with December 31, 2024, primarily reflecting increased borrowings under the 2027 Revolving Credit Facility.

Total equity as of September 30, 2025 was flat compared with December 31, 2024. Net earnings attributable to Kirby of $262.8 million, amortization of share-based compensation of $14.6 million, and stock option exercises of $0.3 million were partially offset by treasury stock purchases of $252.6 million and tax withholdings of $6.0 million on RSU vestings.

25


Long-Term Financing

The following table summarizes the Company’s outstanding debt (in thousands):

September 30,
2025

December 31,
2024

Long-term debt, including current portion:

Revolving Credit Facility due July 29, 2027 (a)

$

175,000

$

Term Loan due July 29, 2027 (a)

70,000

70,000

4.2% senior notes due March 1, 2028

500,000

500,000

3.46% senior notes due January 19, 2033

60,000

60,000

3.51% senior notes due January 19, 2033

240,000

240,000

Credit line due June 30, 2026

Bank notes payable

7,283

8,226

1,052,283

878,226

Unamortized debt discounts and issuance costs

(3,368

)

(3,278

)

$

1,048,915

$

874,948

(a)
Variable interest rate of 5.3% at September 30, 2025 and 5.6% at December 31, 2024.

On July 29, 2022, the Company entered into the 2027 Credit Agreement with a group of commercial banks, with JPMorgan Chase Bank, N.A. as the administrative agent bank that allows for a $500 million 2027 Revolving Credit Facility and a $250 million 2027 Term Loan with a maturity date of July 29, 2027. In the fourth quarter of 2022, the Company repaid $80 million under the 2027 Term Loan prior to scheduled maturities. In the fourth quarter of 2024, the Company repaid $100 million under the 2027 Term Loan prior to scheduled maturities. As a result, no repayments are required until March 31, 2027. Future repayments under the 2027 Term Loan are excluded from short term liabilities because the Company intends to use availability under the 2027 Revolving Credit Facility to repay these amounts upon maturity. Outstanding letters of credit under the 2027 Revolving Credit Facility were $6,000 and available borrowing capacity was $325.0 million as of September 30, 2025.

On February 3, 2022, the Company entered into a note purchase agreement for the 2033 Notes with a group of institutional investors, consisting of $60 million Series A Notes and $240 million Series B Notes, each due January 19, 2033. The Series A Notes were issued on October 20, 2022, and the Series B Notes were issued on January 19, 2023. No principal payments will be required until maturity.

The Company has a $15 million Credit Line with Bank of America for short-term liquidity needs and letters of credit, with a maturity date of June 30, 2026. Outstanding letters of credit under the Credit Line were $6.8 million and available borrowing capacity was $8.2 million as of September 30, 2025.

As of September 30, 2025, the Company was in compliance with all covenants under its debt instruments. For additional information about the Company’s debt instruments, see Note 5, Long-Term Debt, of the Notes to Condensed Financial Statements (Unaudited) as well as Note 5, Long-Term Debt, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024.

Cash Flow and Capital Expenditures

The Company generated positive operating cash flows during the 2025 first nine months with net cash provided by operating activities of $358.0 million compared with $509.1 million for the 2024 first nine months, a 30% decrease. The decline in operating cash flows was mainly due to the timing of accounts receivable collections, accounts payable payments and federal income tax payments, as well as an increase in inventories in 2025, partially offset by increased net earnings. The increase in inventories was due to the impact of higher business activity levels and efforts to manage supply in KDS resulting in the buildup of inventory for projects, mainly due to power generation orders, which are scheduled to be delivered later in 2025 and into 2026. The increase in net earnings was driven by higher term contract pricing in the KMT coastal market, higher spot and term pricing in the KMT inland market during the 2025 first six months, and improved KDS business activity levels in the commercial and industrial and power generation markets, partially offset by lower spot market pricing and barge utilization in the 2025 third quarter in the KMT inland market. During the 2025 and 2024 first nine months, the Company generated cash of $28.3 million and $13.8 million, respectively, from proceeds from the disposition of assets, and $0.3 million and $8.4 million, respectively, from proceeds from the exercise of stock options.

For the 2025 first nine months, cash generated was used for capital expenditures of $217.4 million, including $187.1 million associated with marine maintenance capital and improvements to existing inland and coastal marine equipment and facility improvements, as well as $30.3 million for growth spending in both segments. The growth spending is related to inland equipment construction and equipment for use in a variety of KDS markets including electric fracturing equipment, power generators, and other related equipment. In addition, the Company used cash of $106.5 million for equipment acquisitions in the 2025 first nine months.

26


Treasury Stock Purchases

During the 2025 first nine months, the Company purchased 2.6 million shares of its common stock for $252.6 million, at an average price of $95.38 per share. Subsequent to September 30, 2025 and through November 7, 2025, the Company purchased an additional 0.5 million shares of its common stock for $43.6 million, at an average price of $87.10 per share. On September 8, 2025, the Board approved an eight million share increase in the Company’s purchase authorization. As of November 7, 2025, the Company had approximately 7.7 million shares available under its existing purchase authorizations. Historically, treasury stock purchases have been financed through operating cash flows and borrowings under the Company’s Revolving Credit Facility. The Company is authorized to purchase its common stock on the New York Stock Exchange and in privately negotiated transactions. When purchasing its common stock, the Company is subject to price, trading volume, and other market considerations. Shares purchased may be used for reissuance upon the exercise of stock options or the granting of other forms of incentive compensation, in future acquisitions for stock, or for other appropriate corporate purposes. For more information about stock purchases in the 2025 third quarter, see Part II, Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Liquidity

Funds generated from operations are available for acquisitions, capital expenditure projects, common stock purchases, repayments of borrowings, and for other corporate and operating requirements. In addition to net cash flows provided by operating activities, as of November 7, 2025 the Company also had cash and cash equivalents of $70 million, availability of $345 million under its 2027 Revolving Credit Facility, and $8.2 million available under its Credit Line.

Neither the Company, nor any of its subsidiaries, is obligated on any debt instrument, swap agreement, or any other financial instrument or commercial contract which has a rating trigger, except for the pricing grid on its 2027 Credit Agreement.

The Company expects to continue to fund expenditures for acquisitions, capital construction projects, common stock purchases, repayment of borrowings, and for other operating requirements from a combination of available cash and cash equivalents, funds generated from operating activities, and available financing arrangements.

The 2027 Revolving Credit Facility’s commitment is in the amount of $500 million and matures July 29, 2027. The $500 million 4.2% senior unsecured notes do not mature until March 1, 2028 and require no prepayments. The 2033 Notes do not mature until January 19, 2033 and require no prepayments. The 2027 Term Loan is subject to quarterly installments, beginning March 31, 2027, in increasing percentages of the original principal amount of the loan, with the remaining unpaid balance of approximately $43.8 million payable on July 29, 2027, assuming no prepayments. The 2027 Term Loan is prepayable, in whole or in part, without penalty.

There are numerous factors that may negatively impact the Company’s cash flows in 2025. For a list of significant risks and uncertainties that could impact cash flows, see Note 13, Contingencies and Commitments, of the Notes to Condensed Financial Statements (Unaudited), and Item 1A — Risk Factors and Note 14, Contingencies and Commitments, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. Amounts available under the Company’s existing financial arrangements are subject to the Company continuing to meet the covenants of the credit facilities as described in Note 5, Long-Term Debt, of the Notes to Condensed Financial Statements (Unaudited) as well as Note 5, Long-Term Debt, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024.

The Company has issued guaranties or obtained standby letters of credit and performance bonds supporting performance by the Company and its subsidiaries of contractual or contingent legal obligations of the Company and its subsidiaries incurred in the ordinary course of business. The aggregate notional value of these instruments is $30.5 million at September 30, 2025, including $11.6 million in letters of credit and $18.9 million in performance bonds. All of these instruments have an expiration date within approximately two years. The Company does not believe demand for payment under these instruments is likely and expects no material cash outlays to occur in connection with these instruments.

KMT term contracts typically contain fuel escalation clauses, or the customer pays for the fuel. However, there is generally a 30 to 120 day delay before contracts are adjusted depending on the specific terms of the contract. In general, the fuel escalation clauses are effective over the long-term in allowing the Company to recover changes in fuel costs due to fuel price changes. However, the short-term effectiveness of the fuel escalation clauses can be affected by a number of factors including, but not limited to, specific terms of the fuel escalation formulas, fuel price volatility, navigating conditions, tow sizes, trip routing, and the location of loading and discharge ports that may result in the Company over or under recovering its fuel costs. The Company’s spot contract rates generally reflect current fuel prices at the time the contract is signed but do not have escalators for fuel.

27


The Company has certain mechanisms designed to help mitigate the impacts of rising costs. For example, KMT has long-term contracts which generally contain cost escalation clauses whereby certain costs, including fuel as noted above, can be largely passed through to its customers. Spot contract rates include the cost of fuel and are subject to market volatility. In KDS, the cost of major components for large manufacturing orders is secured with suppliers at the time a customer order is finalized, which somewhat limits exposure to inflation. To the extent possible, the Company also seeks to include contractual language to address recovery of increased costs related to tariffs in KDS. The repair portion of KDS is based on prevailing current market rates.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

For quantitative and qualitative disclosures about market risk, see Part II, Item 7A, “Quantitative and Qualitative Disclosures About Market Risk,” in the Company’s Annual Report on Form 10-K. The Company’s exposure to market risk has not changed materially since December 31, 2024.

Item 4. Controls and Procedures

Disclosure Controls and Procedures . The Company’s management, with the participation of the Chief Executive Officer and the Chief Financial Officer, has evaluated the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (“Exchange Act”)), as of September 30, 2025, as required by Rule 13a-15(b) under the Exchange Act. Based on that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that, as of September 30, 2025, the disclosure controls and procedures were effective to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act (i) is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms and (ii) is accumulated and communicated to the Company’s management, including the Chief Executive Officer and the Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Changes in Internal Control Over Financial Reporting . There were no changes in the Company’s internal control over financial reporting during the quarter ended September 30, 2025 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

28


PART II – OTHER INFORMATION

Item 1. Legal Proceedings

See Note 13, Contingencies and Commitments, of the Notes to Condensed Financial Statements (Unaudited).

Item 1A. Risk Factors

The Company continues to be subject to the risk factors previously disclosed in its “Risk Factors” in Part I, Item 1A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

Period

Total Number of Shares Purchased

Average Price Paid Per Share

Total Number of Shares Purchased as Part of Publicly Announced Plans

Maximum Number of Shares that May Yet be Purchased Under the Plans

July 1 — July 31, 2025

$

August 1 — August 31, 2025

548,201

$

99.00

September 1 — September 30, 2025

765,808

$

85.78

Total

1,314,009

$

91.30

Purchases of the Company’s common stock during the 2025 third quarter were made in the open market pursuant to a discretionary authorization by the Board of Directors. For more information about stock purchases in the 2025 first nine months and other information responsive to this Item, see “Treasury Stock Purchases” in Financial Condition, Capital Resources and Liquidity included in Part I, Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Item 5. Other Information

There were no “Rule 10b5-1 trading arrangements” or “non-Rule 10b5-1 trading arrangements” (as defined in Item 408 of Regulation S-K of the Exchange Act) adopted , modified or terminated during the 2025 third quarter by the Company’s directors and Section 16 officers.

Item 6. Exhibits

EXHIBIT INDEX

Exhibit Number

Description of Exhibits

3.1

Restated Articles of Incorporation of the Company with all amendments to date (incorporated by reference to Exhibit 3.1 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2014).

3.2

Bylaws of the Company, as amended to April 25, 2024 (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed with the Commission on October 28, 2022).

3.3

Amendment to Bylaws of Kirby Corporation dated April 26, 2024 (incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K filed with the Commission on April 26, 2024).

4.1

See Exhibits 3.1, 3.2 and 3.3 hereof for provisions of the Restated Articles of Incorporation of the Company with all amendments to date and the Bylaws of the Company with all amendments to date (incorporated, respectively, by reference to Exhibit 3.1 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2014, Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed with the Commission on October 28, 2022, and Exhibit 3.2 to the Registrant’s Current Report on Form 8-K filed with the Commission on April 26, 2024).

31.1*

Certification of Chief Executive Officer Pursuant to Rule 13a-14(a)

31.2*

Certification of Chief Financial Officer Pursuant to Rule 13a-14(a)

32*

Certification Pursuant to 18 U.S.C. Section 1350

101.INS*

Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document

101.SCH*

Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents

104*

Cover Page Interactive Data File (embedded within the Inline XBRL document)

* Filed herewith.

† Management contract, compensatory plan or arrangement.

29


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

KIRBY CORPORATION

(Registrant)

By:

/s/ Raj Kumar

Raj Kumar

Executive Vice President and

Chief Financial Officer

Dated: November 10, 2025

30


TABLE OF CONTENTS
Part I Financial InformationItem 1. Financial StatementsItem 2. Management S Discussion and Analysis Of Financial Condition and Results Of OperationsItem 3. Quantitative and Qualitative Disclosures About Market RiskItem 4. Controls and ProceduresPart II Other InformationItem 1. Legal ProceedingsItem 1A. Risk FactorsItem 2. Unregistered Sales Of Equity Securities and Use Of ProceedsItem 5. Other InformationItem 6. Exhibits

Exhibits

3.1 Restated Articles of Incorporation of the Company with all amendments to date (incorporated by reference to Exhibit 3.1 to the Registrants Annual Report on Form 10-K for the year ended December 31, 2014). 3.2 Bylaws of the Company, as amended to April 25, 2024 (incorporated by reference to Exhibit 3.1 to the Registrants Current Report on Form 8-K filed with the Commission on October 28, 2022). 3.3 Amendment to Bylaws of Kirby Corporation dated April 26, 2024 (incorporated by reference to Exhibit 3.2 to the Registrants Current Report on Form 8-K filed with the Commission on April 26, 2024). 4.1 See Exhibits 3.1, 3.2 and 3.3 hereof for provisions of the Restated Articles of Incorporation of the Company with all amendments to date and the Bylaws of the Company with all amendments to date (incorporated, respectively, by reference to Exhibit3.1to the Registrants Annual Report on Form 10-K for the year ended December 31, 2014, Exhibit3.1to the Registrants Current Report on Form 8-K filed with the Commission on October 28, 2022, and Exhibit3.2to the Registrants Current Report on Form 8-K filed with the Commission on April 26, 2024). 31.1* Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) 31.2* Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) 32* Certification Pursuant to 18 U.S.C. Section 1350