X0303 4 2010-06-29 0000874501 AMBAC FINANCIAL GROUP INC ABK 0001194137 BIENSTOCK GREGG L AMBAC FINANCIAL GROUP, INC. ONE STATE STREET PLAZA NEW YORK NY 10004 0 1 0 0 Senior Vice President Common Stock 2010-06-29 4 S 0 26290 .66 D 53039 D Common Stock 2010-06-29 4 S 0 14100 .67 D 38939 D Common Stock 13766 I Savings Plan Trust Based on a plan statement as of May 31, 2010. Patricia Lo Cascio, Attorney in Fact for Gregg L. Bienstock 2010-06-30