X0204 3/A 2012-03-20 2011-04-27 0 0000720002 MAINSOURCE FINANCIAL GROUP MSFG 0001519621 HARRISON CHRIS M 2105 NORTH STATED ROAD 3 BYPASS GREENSBURG IN 47240 0 1 0 0 Sr. VP Branch Administration, subsidiary, MainSource Bank Common Stock 2437 I By 401-k Stock Option (right to Buy) 17.01 2007-12-31 2017-02-19 Common Stock 2000 D Stock Option (Right to Buiy) 5.40 2009-12-31 2019-02-22 Common Stock 8167 D Between January 1, 2011 and December 31, 2011, the reporting person acquired 459 shares of MainSource common stock under the MainSource 401(k) plan. The information in this report is based on a plan statement dated as of December 31, 2011. Option was 10% vested on 12/31/2007; was 30% vested on 12/31/2008; 60% vested on 12/31/2009; and 100% vested on 12/31/2010. Option was 10% vested on 12/31/2009; was 30% vested on 12/31/2010; 60% vested on 12/31/2011; and will be 100% vested on 12/31/2012, provided that the option will not be exercisable as long as the U.S. Treasury holds shares of Series A Preferred stock of the issuing company. As authorized by Power of Attorney Chris M. Harrison 2012-03-20