SHAREHOLDER ALERT: WeissLaw LLP Investigates Great Western Bancorp, Inc.

NEW YORK, Sept. 17, 2021 /PRNewswire/ — WeissLaw LLP is investigating possible breaches of fiduciary duty and other violations of law…

NEW YORK, Sept. 17, 2021 /PRNewswire/ — WeissLaw LLP is investigating possible breaches of fiduciary duty and other violations of law by the board of directors of Great Western Bancorp, Inc. («Great Western» or the «Company») (NYSE: GWB) in connection with the proposed acquisition of the Company by First Interstate BancSystem, Inc. («First Interstate») (NASDAQ: FIBK). Under the terms of the merger agreement, Great Western shareholders will receive .8425 shares of First Interstate stock for each Great Western share they own, representing implied per-share merger consideration of approximately $33.00 based upon First Interstate’s September 16, 2021 closing price of $39.17. Upon completion of the transaction, First Interstate shareholders will own approximately 57% of the combined company, while Great Western shareholders will only own 43% of the combined company.

If you own Great Western shares and wish to discuss this investigation or have any questions concerning this notice or your rights or interests, visit our website:

https://www.weisslaw.co/news-and-cases/gwb

Or please contact:

Joshua Rubin, Esq.

WeissLaw LLP

1500 Broadway, 16th Floor

New York, NY 10036

(212) 682-3025

(888) 593-4771

stockinfo@weisslawllp.com

WeissLaw LLP is investigating whether: (i) Great Western’s board of directors acted in the best interests of Company shareholders in agreeing to the proposed transaction, (ii) the per-share merger consideration adequately compensates Great Western’s shareholders, and (iii) all information regarding the sales process and valuation of the transaction will be fully and fairly disclosed.

WeissLaw LLP has litigated hundreds of stockholder class and derivative actions for violations of corporate and fiduciary duties. We have recovered over a billion dollars for defrauded clients and obtained important corporate governance relief in many of these cases. If you have information or would like legal advice concerning possible corporate wrongdoing (including insider trading, waste of corporate assets, accounting fraud, or materially misleading information), consumer fraud (including false advertising, defective products, or other deceptive business practices), or anti-trust violations, please email us at stockinfo@weisslawllp.com

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SOURCE WeissLaw LLP