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): August 23, 2012

AMERICAN INTERNATIONAL GROUP, INC.

(Exact name of registrant as specified in its charter)

180 Maiden Lane

New York, New York 10038

(Address of principal executive offices)

Registrant’s telephone number, including area code: (212) 770-7000

(Former name or former address, if changed since last report.)

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):

Section 8 — Other Events

Item 8.01. Other Events.

Subordinated Notes Closing

On August, 23 2012, American International Group, Inc. (“AIG”) closed the sale of $250,000,000 of AIG’s 2.375% Subordinated Notes due 2015 (the “Notes”).

The following documents relating to the sale of the Notes are filed as exhibits to this Current Report on Form 8-K:

Notes as Covered Debt under the Replacement Capital Covenants

AIG originally entered replacement capital covenants (the “Original RCCs”) in connection with the issuance of the eight series of AIG’s Junior Subordinated Debentures (collectively, the “Junior Subordinated Debentures”). Each Original RCC runs in favor of and is for the benefit of the holders (or beneficial owners holding through a participant in a clearing agency) of the “covered debt.”

Pursuant to the terms of AIG’s outstanding Original RCCs and subject to compliance therewith, the Notes, as of their issuance on August 23, 2012, are “covered debt” under each Original RCC and the “initial covered debt”, which consisted of AIG’s 6.25% Notes due 2036, CUSIP 026874AZ0, is no longer “covered debt” under each Original RCC.

Each Original RCC, in the form it was executed, is incorporated by reference herein. Each Original RCC has now been amended as described below.

Amendment to the Original RCCs

The holders of the Notes, as the holders of the “covered debt” under the Original RCCs, have irrevocably consented to certain amendments to each of those Original RCCs. The amendments to the Original RCCs delete all of the covenants that currently restrict AIG’s ability to repay, redeem or purchase the applicable series of the Junior Subordinated Debentures, because these provisions of the Original RCCs are no longer required to improve the equity credit ascribed to the Junior Subordinated Debentures by the rating agencies.

The amendment to the Original RCCs is filed as an exhibit to this Current Report on Form 8-K and is incorporated by reference herein.

New Replacement Capital Covenants

AIG has entered into new replacement capital covenants (the “New RCCs”) for the initial benefit of the holders of the Notes, in connection with AIG’s 5.75% Series A-2 Junior Subordinated Debentures and AIG’s 4.875% Series A-3 Junior Subordinated Debentures.

AIG covenants in each New RCC that AIG will not repay, redeem or purchase, nor shall any of its subsidiaries purchase, the applicable series of Junior Subordinated Debentures prior to the scheduled termination date of that New RCC, which is the same as the scheduled termination date of the Original RCC that it replaced (or such earlier date on which that New RCC terminates by its terms), unless, subject to certain limitations, since the date 360 days prior to the date of that repayment, redemption or purchase AIG has received a specified amount of net cash proceeds from the sale of common stock or certain other qualifying securities that have certain characteristics that are at least as equity-like as the applicable characteristics of the applicable series of Junior Subordinated Debentures, or AIG or its subsidiaries have issued a specified amount of common stock in connection with the conversion or exchange of certain convertible or exchangeable securities.

AIG may amend or supplement any New RCC from time to time after obtaining the consent of the holders of a majority of the then-outstanding principal amount of the then-effective series of “covered debt”, and, under certain conditions, without such consent.

AIG’s covenants in the New RCCs initially run to the benefit of the holders of the Subordinated Notes, but the Subordinated Notes will cease to be “covered debt”, and those holders will not be entitled to the benefit of the New RCCs, beginning two years prior to the stated maturity of the Subordinated Notes or such earlier date as the outstanding principal amount of the Subordinated Notes is less than $100,000,000 as a result of any redemption or repurchase of Subordinated Notes by AIG or its subsidiaries. The New RCCs are also not a term of the Subordinated Notes or the Subordinated Debt Indenture or First Supplemental Indenture under which the Subordinated Notes were issued. The New RCCs are the separate contractual arrangements of AIG.

The New RCCs are filed as exhibits to this Current Report on Form 8-K and are incorporated by reference herein.

Item 9.01 Financial Statements and Exhibits.

See accompanying Exhibit Index.

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 hereunto duly authorized.

EXHIBIT INDEX