NEW YORK (Bloomberg)—American International Group Inc., the bailed-out insurer, disclosed details of Chief Executive Officer Robert Benmosche’s achievements that allowed him to earn a $3.5 million performance-linked bonus.

Mr. Benmosche helped stabilize New York-based AIG’s ratings with Standard & Poor’s Corp. and Moody’s Investors Service, imposed risk-management controls and filled manager vacancies, the company said Tuesday in a filing. The insurer amended an earlier disclosure after the U.S. Securities and Exchange Commission requested the information, said Mark Herr, an AIG spokesman.

“While AIG does not believe that the additional disclosure is material, it filed the amendment to provide full transparency of its compensation decisions,” Mr. Herr said in an e-mailed statement.

Long-term incentive awards for AIG managers including Mr. Benmosche, Chief Financial Officer David Herzog, and property/casualty head Kristian Moor are linked to the insurer’s business performance and restructuring. Mr. Benmosche, 66, secured a $7 million annual salary and as much as $3.5 million in long-term incentive awards after joining AIG a year ago.

The insurer, which is repaying loans within its $182.3 billion bailout, is seeking to retain staff while responding to lawmakers who said it rewarded employees without regard to performance. Top earners at AIG are subject to the Treasury Department’s special master for executive compensation.

The insurer said in an April filing that Mr. Benmosche had “substantially achieved or exceeded his target performance levels” needed to earn his incentive awards, without specifying how he had done so.

AIG’s so-called long-term performance units will be settled in cash, the firm said in May. The units are “designed to serve as a proxy for AIG’s long-term value” and are 80% tied to junior debt and 20% tied to common stock, the company said.

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