Just as reports over the past week have claimed, Facebook has officially filed its initial public offering (IPO) documents with the SEC this afternoon, worth $5 billion. The company was initially expected to file an IPO closer to $10 billion, but has elected to start small and move up, meaning it still has the change to be one of the largest tech IPOs in history. 

Morgan Stanley will be the lead underwriter on the IPO, while Goldman Sachs and Bank of America will help out. Shares are expected to begin being traded sometime in May of this year. 

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