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Greenberg's troop, C.V. Starr, said in a filing on Tuesday that it continues to work with its adviser, investment bank Perella Weinberg Partners, on strategic options, including buying assets from AIG, catching it not to be disclosed, or trying to buy it in a proxy fight.

In regular arrangement to take such steps, Greenberg would regard to receive approval from the New York Department of Insurance, given strict laws governing those who hold more than 10 percent of an underwriter's stock.

A spokesman for New York Insurance Superintendent Eric Dinallo was not immediately profitable with respect to comment.

AIG's credit ratings bear been cut this week, heightening concerns that it might toothed for bankruptcy. AIG shares were down 45 percent to $2.60 in afternoon trading.

Greenberg has been an competitor of AIG since he left the copartnership in 2005 amid charges of financial misconduct leveled by then-New York Attorney General Eliot Spitzer and the U.S. Securities and Exchange Commission. Greenberg denied wrongdoing.

Asked end for end Greenberg's intentions, his spokesman, Glen Rochkind, said, "The statement (filing) speaks for itself." AIG did not return a call seeking remark.

Greenberg controls about 12 percent of AIG's stock through a personal stake and shares held in a clan trust and in companies he controls.

(Reporting by Dan Wilchins, additional reporting by Lilla Zuill; editing by John Wallace)