U.S. Markets closed

Twitter files for IPO

Gabriel Bouys | AFP | Getty Images

Twitter said in a tweet tonight that it has confidentially submitted a document to the SEC with plans for an initial public offering of stock.

Shares of social media companies like Facebook (FB)and LinkedIn (LNKD)ticked slightly higher in after-hours trading after Twitter disclosed it had filed.

The company did not reveal any additional details, including any information on timing, other than to confirm the tweet is authentic. It was not immediately clear why the filing was made confidentially.

Twitter has been valued at around $10 billion. It's IPO has been long-awaited on Wall Street

This is a breaking news story. Check back for updates.