San Francisco—Twitter Inc. has filed paperwork with the Securities and Exchange Commission to become a public company. The company's initial public offering, expected in early 2014, could raise between $12 billion and $15 billion.
The company announced its filing in a tweet late Thursday. Twitter will be the last of the major social networks to go public. LinkedIn Corp. debuted as a public company in May 2011, and Facebook Inc. went public in May 2012.
Earlier this week, Twitter acquired mobile ad exchange company MoPub Inc., signaling a move beyond its traditional promoted tweets ad offerings and into programmatic ad buying.