MDU Resources Group, Inc.

MDU Resources Group, Inc.
1200 West Century Avenue
P.O. Box 5650
Bismarck, ND 58506-5650
(701) 530-1000 or,
Toll Free: (866) 760-4852

Transfers of ownership and name changes can be handled directly with our transfer agent:

Wells Fargo Bank, N.A.
Shareowner Services
P.O. Box 64856
St. Paul, MN 55164-0856
(877) 536-3553
www.wellsfargo.com/shareownerservices

For additional information on stock transfers, you may visit the Wells Fargo Shareowner Services web site, FAQ section, at www.wellsfargo.com/shareownerservices.

On March 14, 1924, the company was incorporated under the name Minnesota Northern Power Co. by C.C. Yawkey and Walter Alexander, both lumber businessmen in Wausau, Wis., and R.M. Heskett, a Chicago engineer. Heskett was vice president and general manager, Yawkey and Alexander served as president and secretary-treasurer, respectively, but neither had operating responsibility. The company began acquiring electric properties in eastern Montana.

Stock certificates are valuable and should be protected. To have replacements made, you must furnish an affidavit of ownership and also pay for an indemnity bond executed by a surety company. To avoid such expense and time, we recommend you keep your stock certificates in a safe place, such as your safe or in a safe-deposit box at your bank. It also is recommended that you mail stock certificates, endorsed or not, by certified mail. If you are enrolled in the Dividend Reinvestment Plan, you have the option of depositing your common stock certificates in the Plan.

If your MDU Resources Group, Inc. stock certificates are lost, stolen, or destroyed, notify our transfer agent, Wells Fargo Bank, N.A., immediately.

Participants in the Dividend Reinvestment Plan are mailed a statement each time a purchase is made in the Plan. The bottom portion of the statement can be detached and used to change an address, terminate participation, or to purchase, withdraw, sell, deposit or transfer shares.

Yes, it has traded on the New York Stock Exchange under the ticker symbol MDU since September 20, 1948.

When you sell your stock you will need to report any gain or loss on your federal income tax return. Because of this, it is very important to keep a record of the price you paid for your shares and the selling price. If you are a participant in the Dividend Reinvestment Plan, your account statement contains tax-related information and should be retained for income tax purposes. It is the participant's responsibility to retain these records.

IRS Form 1099: All shareholders will receive Internal Revenue Service Form 1099 shortly after the first of each year. This form will report your total dividends earned for the calendar year. You should consult your tax advisor.

MDU Resources is a calendar year end, December 31.

Yes, MDU Resources Group, Inc. has paid consecutive quarterly dividends since 1937. And in November of 2009 increased dividends 1.6% marking the 19th consecutive year of increases.

Stock purchased and held for stockholders by a broker is listed with the company in the broker's name or street name. All annual and quarterly reports, proxy material and dividend payments are sent to you through your broker. If your stock is in street name and you wish to participate in the dividend reinvestment feature of the company's Dividend Reinvestment and Direct Stock Purchase Plan, or become a stockholder of record, contact your broker.

As of March 31, 2010, MDU Resources common stock was held by 15,418 shareholders of record. The states that currently represent the greatest proportion of shareholders are New York and North Dakota holding 85 and 7 percent, respectively, of all shares outstanding. South Dakota is the third largest holding by state with 1 percent of all shares outstanding. In addition, nearly 400 institutions own about 49 percent of all shares outstanding of MDU Resources stock.

The Company's common stock may be purchased directly through the company with an initial investment of $250 by contacting our transfer agent or completing an Account Authorization Form:

Wells Fargo Bank, N.A.
Shareowner Services
P.O. Box 64856
St. Paul, MN 55164-0856
(877) 536-3553
www.shareowneronline.com

Shareowners of record may purchase additional shares of common stock through the Company's Dividend Reinvestment and Direct Stock Purchase Pan.

The Company's common stock held in certificate form may be sold through a brokerage firm. Shares held in the Dividend Reinvestment Plan may be sold by using the authorization form on the back of the quarterly Dividend Reinvestment account statement and returning it in the envelope provided.

The MDU Resources Foundation was formed in 1983 as a way to give back to the communities MDU Resources serves. Since its incorporation, the Foundation has contributed more than $14 million to charities and organizations. The areas of philanthropy the Foundation supports are Health and Human Services, Education, Civic and Community Activities, Culture and Arts and Environment. Generally, contributions are restricted to organizations qualified as tax exempt under Section 501©(3) of the Internal Revenue Code. The Foundation is funded annually by contributions from our member companies.

If you are already a registered shareowner, our Direct Registration Profile Modification System allows us to issue shares to you in book-entry form. Shares held in book-entry form cannot be lost, stolen or misplaced, eliminating the cost related to safekeeping or replacing stock certificates. You will be able to request electronic movement of book-entry shares between your account at Wells Fargo Shareowner Services, and your account at your Broker/Dealer, which will eliminate time, cost and risk related to transporting physical certificates.

To convert your certificates to book-entry form, mail the certificates, along with instructions to:

Wells Fargo Shareowner Services
161 North Concord Exchange
South St. Paul, MN 55075-1139

We suggest you send your certificates by registered mail, insured for 2 percent of the market value, which is the cost of replacing lost certificates. A confirmation of the transaction will be mailed to you for your records.

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