Proxy Materials

Proxy Voting
The Board of Directors is furnishing proxy materials to solicit proxies for use at the Annual Meeting of Stockholders on May 14, 2024, and any adjournment(s) thereof. If you are a stockholder of record at the close of business on March 15, 2024, you are encouraged to vote in advance of the meeting using one of the following voting methods:

Beneficial Stockholders:
If your shares are held beneficially in the name of a bank, broker, or other holder of record (sometimes referred to as holding shares “in street name”), you will receive voting instructions from your bank, broker, or other holder of record. If you wish to vote in person at the annual meeting, you must obtain a legal proxy from your bank, broker, or other holder of record of your shares and present it at the meeting.

Registered Stockholders:
If your shares are held directly with our stock registrar, you will receive either a Notice Regarding Availability of Proxy Materials (Notice) or a Proxy Card with the proxy materials. You can vote your shares any one of four ways:

The Internet:
Go to the website shown on your Notice or Proxy Card, if you received one, and follow the instructions.

By Telephone:
Call the telephone number shown on the Notice or Proxy Card, if you received one, and follow the instructions given by the voice prompts.

Voting via the Internet or by telephone authorizes the named proxies to vote your shares in the same manner as if you marked, signed, dated, and returned a Proxy Card by mail. Your voting instructions may be transmitted up until 11:59 p.m. Eastern Time on May 13, 2024.

By Mail:
If you received paper copies of the Proxy Statement, Annual Report, and Proxy Card, mark, sign, date, and return the Proxy Card in the postage-paid envelope provided.

In Person:
Attend the annual meeting or send a personal representative with an appropriate proxy to vote by ballot at the meeting.

Admission to the Annual Meeting
Stockholders of record must request an admission ticket to attend the annual meeting. To request an admission ticket, contact MDU Resources by email at [email protected] or by telephone at 701-530-1010. A ticket will be mailed to you. Requests must be received no later than May 7, 2024.

Annual Meeting Webcast
MDU Resources will webcast its Annual Meeting of Stockholders at 10:30 a.m. CDT May 14. The link below to access the webcast will be active at 10:15 a.m. CDT May 14. Pre-registration is not required to listen to the webcast.