Check out which companies are making headlines after the bell Monday:

Oracle - The tech giant posted earnings of 82 cents a share, excluding one-time items, topping expectations for 78 cents a share. Revenue came in line with estimates at $10.9 billion. The firm had been scheduled to report earnings on Thursday.

The company also announced it will buy back up to $10 billion more in common stock. Shares jumped in extended-hours trading. (Click here for after-hours quote.)

Facebook - The social-networking giant's shares continued to edge higher in extended-hours trading after the company rallied almost 5 percent in the regular session. Earlier, the firm announced it will buy Face.com , a site that provides facial-recognition technology.(Click here for after-hours quote.)

Citigroup - CEO Vikram Pandit told CNBC that the financial giant is ready for the worst case even if Moody's downgrades U.S. banks. He also added that a decision about the firm's dividend increase will be made at the end of the year. (Click here for after-hours quote.)

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