X0202 4 2006-08-25 0000874501 AMBAC FINANCIAL GROUP INC ABK 0001272760 UHLEIN JOHN W AMBAC FINANCIAL GROUP, INC. ONE STATE STREET PLAZA NEW YORK NY 10004 0 1 0 0 Executive Vice President Common Stock 2006-08-25 4 M 0 11300 69.77 A 99157 D Common Stock 2006-08-25 4 S 0 100 85.33 D 99057 D Common Stock 2006-08-25 4 S 0 100 85.34 D 98957 D Common Stock 2006-08-25 4 S 0 100 85.35 D 98857 D Common Stock 2006-08-25 4 S 0 2100 85.36 D 96757 D Common Stock 2006-08-25 4 S 0 500 85.38 D 96257 D Common Stock 2006-08-25 4 S 0 200 85.40 D 96057 D Common Stock 2006-08-25 4 S 0 100 85.43 D 95957 D Common Stock 2006-08-25 4 S 0 1700 85.44 D 94257 D Common Stock 2006-08-25 4 S 0 1900 85.47 D 92357 D Common Stock 2006-08-25 4 S 0 100 85.48 D 92257 D Common stock 2006-08-25 4 S 0 200 85.49 D 92057 D Common Stock 2006-08-25 4 S 0 3400 85.50 D 88657 D Common Stock 2006-08-25 4 S 0 300 85.51 D 88357 D Common Stock 2006-08-25 4 S 0 200 85.52 D 88157 D Common Stock 2006-08-25 4 S 0 100 85.53 D 88057 D Common Stock 2006-08-25 4 S 0 200 85.54 D 87857 D Common Stock 1439 I Savings Plan Trust Common Stock 75 I IRA Common Stock 90 I IRA By Spouse Employee Stock Option (Right to Buy) 69.77 2006-08-24 4 M 0 11300 0 D 2003-12-18 2007-01-24 Common Stock 11300 0 D Based on a plan statement as of July 31, 2006. Stacey Spain, Attorney-in-fact for John W. Uhlein 2006-08-28