Treasury puts AIG shares on the auction block The U.S. Treasury is offloading $18 billion worth of American International Group ( NYS: AIG ) in a public offering, The Wall Street Journal reports. The offering will be the Treasury's fifth sale, leaving the government with less than a one-fifth stake in the company by the time the trading is over. AIG will buy back up to $5 billion as part of the sale, the Journal reports.