As filed with the Securities and Exchange Commission on March 24, 2000. Registration No. 333-27879 ================================================================================ SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------------------------------- POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ---------------------------------- MDU RESOURCES GROUP, INC. (Exact name of registrant as specified in its charter) Delaware No. 41-0423660 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) Schuchart Building 918 East Divide Avenue P.O. Box 5650 Bismarck, North Dakota 58506-5650 (Address of principal executive offices, including zip code) ---------------------------------- MDU RESOURCES GROUP, INC. 1997 EXECUTIVE LONG-TERM INCENTIVE PLAN (Full title of the plan) ---------------------------------- Warren L. Robinson Executive Vice President, Treasurer and Chief Financial Officer MDU Resources Group, Inc. Schuchart Building 918 East Divide Avenue P.O. Box 5650 Bismarck, North Dakota 58506-5650 (701) 222-7900 (Name, address and telephone number, including area code, of agent for service) ================================================================================ PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT Item 3. Incorporation of Documents by Reference. The following documents, which MDU Resources Group, Inc. (the "Company") has filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange Act"), are hereby incorporated by reference in this registration statement: 1. Annual Report on Form 10-K for the year ended December 31, 1999, including those portions of the Annual Report to Stockholders incorporated by reference therein. 2. Description of the Company's common stock contained in the Company's registration statement on Form 8-A/A, dated March 23, 2000, and any amendments thereto. 3. Description of the Company's preference share purchase rights contained in the registration statement on Form 8-A/A, dated March 23, 2000, and any amendments thereto. All documents subsequently filed by the Company pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the filing of a post-effective amendment which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference in this registration statement and to be part hereof from the date of filing of such documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for the purposes of this registration statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this registration statement. Item 8. Exhibits. *4(a) Restated Certificate of Incorporation, filed as Exhibit 3(a) to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 1999, in File No. 1-3480. *4(b) By-laws of the Company, as amended to date, filed as Exhibit 3(b) to the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 1998, in File No. 1-3480. *4(c) Rights Agreement, dated as of November 12, 1998, between the Company and Norwest Bank Minnesota, N.A., filed as Exhibit 4.1 to Form 8-A on November 12, 1998, in File No. 1-3480. - ---------- *Incorporated herein by reference as indicated. II-1 5(a) Opinion of Lester H. Loble, II, Esq., General Counsel to the Company. 5(b) Opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P., counsel to the Company. 23(a) Consent of Arthur Andersen LLP. 23(b) Consent of Lester H. Loble, II, Esq. (contained in opinion filed as Exhibit 5(a) hereto). 23(c) Consent of LeBoeuf, Lamb, Greene & MacRae, L.L.P. (contained in opinion filed as Exhibit 5(b) hereto). II-2 SIGNATURES The Registrant. Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this post-effective amendment to the registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Bismarck, State of North Dakota, on the 23rd day of March, 2000. MDU RESOURCES GROUP, INC. By: /s/ Martin A. White ----------------------------- Martin A. White President and Chief Executive Officer Pursuant to the requirements of the Securities Act of 1933, this post-effective amendment to the registration statement has been signed by the following persons in the capacities and on the date indicated. Signature Title Date --------- ----- ---- /s/ Martin A. White Chief Executive Officer and March 23, 2000 - -------------------------------- Director Martin A. White (President and Chief Executive Officer) * Chief Administrative and March 23, 2000 - -------------------------------- Corporate Development Douglas C. Kane Officer and Director (Executive Vice President, Chief Administrative and Corporate Development Officer) /s/ Warren L. Robinson Chief Financial Officer March 23, 2000 - -------------------------------- Warren L. Robinson (Executive Vice President, Treasurer and Chief Financial Officer) * Chief Accounting Officer March 23, 2000 - -------------------------------- Vernon A. Raile (Vice President, Controller and Chief Accounting Officer) II-3 Signature Title Date --------- ----- ---- * Director March 23, 2000 John A. Schuchart - -------------------------------- (Chairman of the Board) * Director March 23, 2000 - -------------------------------- San W. Orr, Jr. (Vice Chairman of the Board) * Director March 23, 2000 - -------------------------------- Thomas Everist * Director March 23, 2000 - -------------------------------- Richard L. Muus * Director March 23, 2000 - -------------------------------- Robert L. Nance * Director March 23, 2000 - -------------------------------- John L. Olson * Director March 23, 2000 - -------------------------------- Harry J. Pearce * Director March 23, 2000 - -------------------------------- Homer A. Scott, Jr. * Director March 23, 2000 - -------------------------------- Joseph T. Simmons * Director March 23, 2000 - -------------------------------- Sister Thomas Welder, O.S.B. *By: /s/ Warren L. Robinson March 23, 2000 -------------------------- Warren L. Robinson as Attorney-in-fact for each of the persons indicated by an asterisk II-4 EXHIBIT INDEX *4(a) Restated Certificate of Incorporation, filed as Exhibit 3(a) to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 1999, in File No. 1-3480. *4(b) By-laws of the Company, as amended to date, filed as Exhibit 3(b) to the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 1998, in File No. 1-3480. *4(c) Rights Agreement, dated as of November 12, 1998, between the Company and Norwest Bank Minnesota, N.A., filed as Exhibit 4.1 to Form 8-A on November 12, 1998, in File No. 1-3480. 5(a) Opinion of Lester H. Loble, II, Esq., General Counsel to the Company. 5(b) Opinion of LeBoeuf, Lamb, Greene & MacRae, L.L.P., counsel to the Company. 23(a) Consent of Arthur Andersen LLP. 23(b) Consent of Lester H. Loble, II, Esq. (contained in opinion filed as Exhibit 5(a) hereto). 23(c) Consent of LeBoeuf, Lamb, Greene & MacRae, L.L.P. (contained in opinion filed as Exhibit 5(b) hereto). - ---------- *Incorporated herein by reference as indicated. II-5