Traders work on the floor of the New York Stock Exchange.

Check out the companies making headlines after the bell Monday:

American International Group, the country's No. 1 commercial insurance provider, handed in second-quarter earnings of $1.39 a share, beating estimates of $1.22 a share. The company also raised its quarterly dividend and said it would buy back up to $5 billion in additional shares. The stock wavered in after-hours trading.