MDU 10-K Annual Report Dec. 31, 2018

MDU RESOURCES GROUP INC

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TABLE OF CONTENTS

Part I Item 1B. Unresolved Staff Comments Item 3. Legal Proceedings Item 4. Mine Safety Disclosures Part II Item 5. Market For The Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases Of Equity Securities Item 6. Selected Financial Data Item 6. Selected Financial Data (continued)Item 7. Management's Discussion and Analysis Of Financial Condition and Results Of Operations Item 8 - Note Item 8 - Notes 8 and 19. At December 31, 2018, The Company's Commitments Under These Obligations Were As Follows:Item 8 - Notes Item 7A. Quantitative and Qualitative Disclosures About Market Risk Item 8. Financial Statements and Supplementary Data Note 1 - Summary Of Significant Accounting Policies Note 2 - Revenue From Contracts with Customers Note 3 - Acquisitions Note 4 - Discontinued Operations Note 5 - Goodwill and Other Intangible Assets Note 6 - Regulatory Assets and Liabilities Note 7 - Fair Value Measurements Note 8 - Debt Note 9 - Asset Retirement Obligations Note 10 - Preferred Stocks Note 11 - Common Stock Note 12 - Stock-based Compensation Note 13 - Income Taxes Note 14 - Cash Flow Information Note 15 - Business Segment Data Note 16 - Employee Benefit Plans Part D Subsidy Note 17 - Jointly Owned Facilities Note 18 - Regulatory Matters Note 19 - Commitments and Contingencies Note 20 - Subsequent Event Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure Item 9A. Controls and Procedures Item 9B. Other Information Part III Item 10. Directors, Executive Officers and Corporate Governance Item 11. Executive Compensation Item 12. Security Ownership Of Certain Beneficial Owners and Management and Related Stockholder Matters Item 13. Certain Relationships and Related Transactions, and Director Independence Item 14. Principal Accounting Fees and Services Part IV Item 15. Exhibits, Financial Statement Schedules Note 2 - Debt Note 3 - Dividends Item 16. Form 10-k Summary

Exhibits

+10(t) Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated April 10, 2017 10-Q 6/30/17 10(e) 8/4/17 1-03480 +10(u) Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated August 30, 2017 10-Q 9/30/17 10(a) 11/3/17 1-03480 +10(v) Employment Letter for Jeffrey S. Thiede, dated May 16, 2013 10-K 12/31/13 10(ab) 2/21/14 1-03480 +10(w) Jason L. Vollmer Offer Letter, dated March 7, 2016 8-K 10.2 3/8/16 1-03480 +10(x) Jason L. Vollmer Offer Letter, dated September 20, 2017 8-K 10.1 9/21/17 1-03480 21 Subsidiaries of MDU Resources Group, Inc. 23 Consent of Independent Registered Public Accounting Firm 31(a) Certification of Chief Executive Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 31(b) Certification of Chief Financial Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 32 Certification of Chief Executive Officer and Chief Financial Officer furnished pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 95 Mine Safety Disclosures

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ABB Ltd	ABB

MDU 10-K Fiscal year ended Dec. 31, 2018

Exhibits