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MainSource Financial Group: MainSource Financial Group Promotes Tressler to Senior Vice President, Chief Banking Officer

GREENSBURG, IN--(Marketwire - June 30, 2009) - Archie M. Brown, Jr., President and CEO of MainSource Financial Group, Inc. (NASDAQ: [ MSFG ]) (the "Company"), is pleased to announce the promotion of Daryl R. Tressler to Chief Banking Officer for MainSource Financial Group. Mr. Tressler currently serves as Chairman, President and CEO of the lead affiliate, MainSource Bank. In his new position, he will oversee all MainSource Bank affiliates and locations throughout Indiana, Illinois, Ohio, and Kentucky, in addition to retaining his position within MainSource Bank. His responsibilities include overseeing the administration of all affiliate activities to achieve sales and other strategic objectives.

Mr. Tressler began his career with MainSource in 1973. He has served in various positions, eventually leading him to President and CEO of the lead affiliate, MainSource Bank. He is a native of Decatur County, where he continues to reside with his wife, Carol. He has served the community over the years by holding leadership positions in numerous not for profit organizations.

Mr. Brown commented, "Daryl has been a cornerstone in MainSource Financial Group's success throughout the years. His service to this company, and the community, has provided guidance and leadership that has resulted in tremendous growth for our company. He continues to exemplify the qualities for which MainSource is known, and allowing him to oversee all of our banking operations is a natural fit. We are blessed to have such a talented and trustworthy individual leading this charge."

Mr. Tressler commented, "I am pleased to accept this new position and look forward to managing our banking locations through these challenging times."

MainSource Financial Group is listed on the NASDAQ National Market (under the symbol: "MSFG") and is a community-focused, financial holding company with assets of approximately $2.9 billion. The Company operates 85 banking offices through its three banking subsidiaries, MainSource Bank, Greensburg, Indiana, MainSource Bank of Illinois, Kankakee, Illinois, and MainSource Bank - Ohio, Troy, Ohio. Through its non-banking subsidiaries, MainSource Insurance LLC, and MainSource Title LLC, the Company and its banking subsidiaries provide various related financial services.