First Interstate BancSystem, Inc. Set to Join Russell 3000 Index

BILLINGS, Mont., June 18 /PRNewswire-FirstCall/ -- First Interstate BancSystem, Inc. (Nasdaq: FIBK) is pleased to announce that it is set to join the broad-market Russell 3000® Index when Russell Investments reconstitutes its comprehensive set of U.S. and global equity indexes on June 25, 2010, according to a preliminary list of additions posted on www.russell.com.

(Logo: http://photos.prnewswire.com/prnh/20100329/LA78086LOGO)

(Logo: http://www.newscom.com/cgi-bin/prnh/20100329/LA78086LOGO)

President and CEO Lyle R. Knight stated, "First Interstate is honored to be named to the Russell 3000® Index. It's an important achievement for our company and will enhance our visibility within the investment community."

The Russell 3000® Index measures the performance of the largest 3,000 U.S. companies representing approximately 98% of the investable U.S. equity market. It is constructed to provide a comprehensive, unbiased, and stable barometer of the broad market and is completely reconstituted annually to ensure new and growing equities are reflected.

First Interstate BancSystem, Inc. is a financial services holding company, headquartered in Billings, Montana, with $7.2 billion in assets as of March 31, 2010.  It is the parent company of First Interstate Bank, a community bank operating 72 offices throughout Montana, Wyoming and western South Dakota.  As a recognized leader in community banking services with 22 consecutive years of profitability, First Interstate remains a family business whose culture is driven by strong family and corporate values, as well as a commitment to long-term organic growth, exemplary customer service, exceeding customer expectations through its products and services and supporting with leadership and resources, the communities it serves.

SOURCE First Interstate BancSystem, Inc.