X0203 3 2011-04-27 0 0000720002 MAINSOURCE FINANCIAL GROUP MSFG 0001519648 RUEFF LAWRENCE R 1945 E CO RD 100 S GREENSBURG IN 47240 1 0 0 0 Common Stock 8466 D Common Stock 5792 I By Spouse Common Stock 4196 I Jointly with Spouse Initial filing. Dr. Rueff was elected to the Board of Directors of MainSource Financial Group at the corporation's Annual Meeting held April 27, 2011. As authorized by Power of Attorney. Lawrence R. Rueff DVM 2011-05-05