AMBAC FINANCIAL GROUP INC 4

4 · AMBAC FINANCIAL GROUP INC · Filed May 2, 2005

Insider Transaction Report

Form 4

Period: 2005-04-28

AMBAC FINANCIAL GROUP INCABK

BOYLE DAVID L

Vice Chairman

Transactions

Exercise/Conversion
Common Stock
2005-04-28$31.02/sh+70,628$2,190,881→ 184,675 total
Sale
Common Stock
2005-04-28$65.90/sh−1,800$118,620→ 175,575 total
Sale
Common Stock
2005-04-28$65.89/sh−14,400$948,816→ 161,175 total
Sale
Common Stock
2005-04-28$65.95/sh−2,000$131,900→ 181,175 total
Sale
Common Stock
2005-04-28$65.83/sh−24,900$1,639,167→ 129,047 total
Sale
Common Stock
2005-04-28$65.99/sh−200$13,198→ 184,475 total
Sale
Common Stock
2005-04-28$65.92/sh−1,300$85,696→ 178,475 total
Sale
Common Stock
2005-04-28$65.87/sh−500$32,935→ 160,275 total
Exercise/Conversion
Employee Stock Option (Right to buy)
2005-04-28−70,628→ 0 total
Exercise: $31.02From: 2001-03-29Exp: 2007-01-24→ Common Stock (70,628 underlying)
Sale
Common Stock
2005-04-28$65.93/sh−1,400$92,302→ 179,775 total
Sale
Common Stock
2005-04-28$65.75/sh−2,300$151,225→ 112,447 total
Sale
Common Stock
2005-04-28$65.82/sh−3,300$217,206→ 125,747 total
Sale
Common Stock
2005-04-28$65.79/sh−5,400$355,266→ 115,147 total
Sale
Common Stock
2005-04-28$65.98/sh−100$6,598→ 184,375 total
Exercise/Conversion
Common Stock
2005-04-28$36.83/sh+30,000$1,104,900→ 114,047 total
Sale
Common Stock
2005-04-28$65.88/sh−400$26,352→ 160,775 total
Sale
Common Stock
2005-04-28$65.74/sh−700$46,018→ 111,747 total
Sale
Common Stock
2005-04-28$65.76/sh−300$19,728→ 114,747 total
Sale
Common Stock
2005-04-28$65.96/sh−1,200$79,152→ 183,175 total
Sale
Common Stock
2005-04-28$65.91/sh−1,100$72,501→ 177,375 total
Sale
Common Stock
2005-04-28$65.70/sh−26,900$1,767,330→ 84,047 total
Exercise/Conversion
Employee Stock Option (Right to Buy)
2005-04-28−30,000→ 0 total
Exercise: $36.83From: 2002-01-26Exp: 2006-01-26→ Common Stock (30,000 underlying)
Sale
Common Stock
2005-04-28$65.80/sh−5,100$335,580→ 120,547 total
Sale
Common Stock
2005-04-28$65.85/sh−3,728$245,489→ 155,147 total

Holdings

Common Stock
(indirect: By Spouse)
500
Common Stock
(indirect: By Trust)
4,002

Footnotes (3)

[F1]Based on a plan statement as of March 31, 2005.
[F2]Exercisable as follows: 10,000 shares became exercisable on 1/26/2000, an additional 10,000 shares became exercisable on 1/26/2001, and an additional 10,000 shares became exercisable on 1/26/2002. All shares became exercisable on 1/26/2002.
[F3]Exercisable as follows: fifty percent of the shares at or exceeding $43.3333 for 20 consecutive trading days on the NYSE (10/03/2000) and fifty percent of the shares at or exceedign $56.6667 for 20 consecutive trading days on the NYSE (03/29/2001). All of the shares have become exercisable.

Documents

2 files

4
edgar.xmlPrimary
PRIMARY DOCUMENT
EX-24
boyle.txt
POWER OF ATTORNEY