Check out which companies are making headlines before the bell on Tuesday:

AIG — The insurance banking giant is replacing Baker Hughes In the S&P 100 Index, with S&P citing the drop in the oilfield service company's market cap below the $21 billion mark. Separately, AIG has been designated as "systemically important" and subject to increased regulatory oversight, along with Prudential Financial (PRU) and General Electric's GE Capital unit.