SEC Form SC 13D/A filed by MDU Resources Group Inc. (Amendment)
| * | The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of
              securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. | 
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| CUSIP No. 552690109 |  |  |  | ||||||||
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|  | 1. |  | Name of Reporting Person: CORVEX MANAGEMENT LP | ||||||||
|  | 2. |  | Check the Appropriate Box if a Member of a Group (See Instructions): (a) ☐ (b) ☒ | ||||||||
|  | 3. |  | SEC Use Only: | ||||||||
|  | 4. |  | Source of Funds (See Instructions): AF | ||||||||
|  | 5. |  | Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e): ☐ | ||||||||
|  | 6. |  | Citizenship or Place of Organization: DELAWARE | ||||||||
|  | Number of Shares Beneficially Owned by Each Reporting Person With |  | 7. |  | Sole Voting Power: 10,147,041* | ||||||
|  |  | 8. |  | Shared Voting Power: 0 | |||||||
|  |  | 9. |  | Sole Dispositive Power: 10,147,041* | |||||||
|  |  | 10. |  | Shared Dispositive Power: 0 | |||||||
|  | 11. |  | Aggregate Amount Beneficially Owned by Each Reporting Person: 10,147,041* | ||||||||
|  | 12. |  | Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions): ☐ | ||||||||
|  | 13. |  | Percent of Class Represented by Amount in Row (11): 4.99%* | ||||||||
|  | 14. |  | Type of Reporting Person (See Instructions): PN, IA | ||||||||
|  | * | In addition, accounts of certain private investment funds for which Corvex Management LP (“Corvex”) acts as investment adviser have entered into
              cash-settled total return swaps, representing economic exposure to 1,194,435 Shares (as defined below), or 0.59% of the outstanding Shares. | |||||||||
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| CUSIP No. 552690109 |  |  |  | ||||||||
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|  | 1. |  | Name of Reporting Person: KEITH MEISTER | ||||||||
|  | 2. |  | Check the Appropriate Box if a Member of a Group (See Instructions): (a) ☐ (b) ☒ | ||||||||
|  | 3. |  | SEC Use Only: | ||||||||
|  | 4. |  | Source of Funds (See Instructions): AF | ||||||||
|  | 5. |  | Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e): ☐ | ||||||||
|  | 6. |  | Citizenship or Place of Organization: United States | ||||||||
|  | Number of Shares Beneficially Owned by Each Reporting Person With |  | 7. |  | Sole Voting Power: 10,147,041* | ||||||
|  |  | 8. |  | Shared Voting Power: 0 | |||||||
|  |  | 9. |  | Sole Dispositive Power: 10,147,041* | |||||||
|  |  | 10. |  | Shared Dispositive Power: 0 | |||||||
|  | 11. |  | Aggregate Amount Beneficially Owned by Each Reporting Person: 10,147,041* | ||||||||
|  | 12. |  | Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions): ☐ | ||||||||
|  | 13. |  | Percent of Class Represented by Amount in Row (11): 4.99%* | ||||||||
|  | 14. |  | Type of Reporting Person (See Instructions): IN, HC | ||||||||
|  | * | In addition, accounts of certain private investment funds for which Corvex acts as investment adviser have entered into cash-settled total return
              swaps representing economic exposure to 1,194,435 Shares (as defined below), or 0.59% of the outstanding Shares. | |||||||||
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| Date: January 24, 2023 |  |  |  | CORVEX MANAGEMENT LP | ||
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|  |  |  |  | By: |  | /s/ Keith Meister | 
|  |  |  |  |  |  | Keith Meister | 
|  |  |  |  |  |  | Managing Partner | 
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| Date: January 24, 2023 |  |  |  | KEITH MEISTER | ||
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|  |  |  |  | By: |  | /s/ Keith Meister | 
|  |  |  |  |  |  | Keith Meister |