NORTHWEST BANCORPORATION, INC. SHAREHOLDER ALERT

Rigrodsky & Long, P.A. Announces Investigation of Merger

Rigrodsky & Long, P.A.:

• Do you own shares of Northwest Bancorporation, Inc. (OTC PINK: NBCT)?
• Did you purchase any of your shares prior to April 25, 2018?
• Do you think the proposed merger is fair?
• Do you want to discuss your rights?

Rigrodsky & Long, P.A. announces that it is investigating potential legal claims against the board of directors of Northwest Bancorporation, Inc. (“Northwest” or the “Company”) (OTC PINK: NBCT) regarding possible breaches of fiduciary duties and other violations of law related to the Company’s entry into an agreement to merge with First Interstate BancSystem, Inc. (“First Interstate”) (NASDAQ GS: FIBK) in a transaction valued at approximately $160.9 million. Under the terms of the agreement, shareholders of Northwest will receive 0.516 shares of First Interstate Class A common stock in exchange for each share of Northwest common stock they hold. The exchange ratio is fixed and the shares received by Northwest shareholders are expected to qualify as a tax-free exchange. Northwest shareholders will own approximately 6% of First Interstate once the transaction is complete.

If you own common stock of Northwest and purchased any shares before April 25, 2018, if you would like to learn more about this investigation, or if you have any questions concerning this announcement or your rights or interests, please contact Seth D. Rigrodsky or Gina M. Serra at Rigrodsky & Long, P.A., 300 Delaware Avenue, Suite 1220, Wilmington, Delaware 19801, by telephone at [phone], or by e-mail at [e-mail].

Rigrodsky & Long, P.A., with offices in Wilmington, Delaware, Garden City, New York, and San Francisco, California, has recovered hundreds of millions of dollars on behalf of investors and achieved substantial corporate governance reforms in numerous cases nationwide, including federal securities fraud actions, shareholder class actions, and shareholder derivative actions.

Attorney advertising. Prior results do not guarantee a similar outcome.

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