X0303 4 2009-09-30 0 0000842517 ISABELLA BANK CORP IBTB 0001260122 BARZ RICHARD J 1110 MEADOW DRIVE MT. PLEASANT MI 48858 1 1 0 0 Senior Vice President common 2009-09-30 4 J 0 54.4829 17.87 A 7543.8007 D Common 2009-12-31 4 J 0 127.7985 18.89 A 7671.5942 D earned in dividend reinvestment program earned in dividend reinvestment program Richard J. Barz 2010-01-04