Chubb Ltd — Director's Dealing 2010

May 20, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ACE Ltd (ACE)
CIK: 0000896159
Period of Report: 2010-05-18

Reporting Person: Dowd Brian Edward (Vice Chairman, ACE Limited*)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-18	Common Shares	A	5000	—	Acquired	190326	Direct
2010-05-18	Common Shares	F	8124	$52.75	Disposed	179000.79	Direct

Footnotes

F1: Represents a premium award pursuant to the ACE Limited 2004 Long-Term Incentive Plan. As disclosed in the Company's Current Report on Form 8-K dated February 28, 2006, the reporting person was entitled to a premium performance award equal to 100% of the number of actual shares earned from the target award granted on February 22, 2006 if the Company's cumulative performance over the four year performance period exceeded the peer group's 75th percentile. On May 18, 2010, the Compensation Committee determined that such performance measure had been met and the premium shares were issued.

F2: Common Shares being withheld in order to pay tax liability.

F3: Total includes (i) 1,496.79 common shares purchased or received from dividend reinvestments at various times during 2005, 2006, 2007 and 2008 pursuant to the ACE Limited Employee Stock Purchase Plan which meets the requirements of Rule 16b-3, and (ii) the sale of 4,698 common shares in December 2004, which was before the reporting person became a reporting person and which was inadvertently not reflected in the total reported on the reporting person's Form 3 filed on March 10, 2005.