UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

Current Report

Pursuant To Section 13 or 15 (d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 15, 2014

ACE LIMITED

(Exact name of registrant as specified in its charter)

Baerengasse 32

CH-8001 Zurich, Switzerland

(Address of principal executive offices)

Registrant’s telephone number, including area code: +41 (0)43 456 76 00

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

At the company’s annual general meeting held on May 15, 2014, the company’s shareholders approved an amendment to Article 6 of the Articles of Association to authorize the company’s Board of Directors to increase the company’s share capital within two years following the 2014 annual general meeting to a maximum amount equal to CHF 3,722,600,000, which amount would be divided into 140,000,000 shares. In connection therewith, the amendment limits or withdraws the shareholders’ pre-emptive rights in specified and limited circumstances, all as further described in the company’s proxy statement dated April 3, 2014 under the heading “Agenda Item No. 9: Amendment of the Articles of Association Relating to Authorized Share Capital for General Purposes.” The company’s amended Articles of Association containing these amendments will become effective upon registration with the Commercial Register of the Canton of Zurich, Switzerland (the “Swiss Commercial Register”). Subject to the subsequent approval by Swiss Federal Commercial Register Office, the effective date of such registration is expected to be on or about May 19, 2014.

At the company’s 2014 annual general meeting, the company’s shareholders also prospectively approved amendments to the company’s Articles of Association in conjunction with their approval of payments of a dividend in the form of distribution through par value reduction, all as further described in the company’s proxy statement dated April 3, 2014, under the heading “Agenda Item No.10: Approval of Distribution to Shareholders in the Form of Par Value Reduction.” Such amendments will become effective with the registration of each quarterly par value reduction in the Swiss Commercial Register.

A copy of the amended Articles of Association is attached hereto as Exhibit 3.1 and incorporated herein by reference.

The company convened its annual general meeting of shareholders on May 15, 2014 pursuant to notice duly given. The matters voted upon at the meeting and the results of such voting are set forth below.

At the 2014 annual general meeting abstentions and broker non-votes were not considered in the tabulation of the vote (and thus should be disregarded) to determine approval of each of the items below, with the exception of Item 9 (the amendment to the Articles of Association relating to authorized share capital for general purposes). Because Item 9 required an affirmative two-thirds of the votes present (in person or by proxy) for approval, abstentions and broker non-votes had the effect of an “against” vote because they are counted as present but not “for” such item, all as further described in the company’s proxy statement dated April 3, 2014, under the headings “What is the Effect of Broker Non-Votes and Abstentions?” and “What Vote is Required to Approve Each Agenda Item?”.

The voting results for Agenda Item No. 3 exclude shares held by the company’s directors and executive officers, who are not permitted by law to vote their shares on the discharge of the Board of Directors.

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(d) Exhibits

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

DATE: May 16, 2014

EXHIBIT INDEX