John Paulson’s hedge funds last quarter acquired a 7 percent stake in Starwood Hotels & Resorts Worldwide Inc., becoming the biggest shareholder in the company as it explores strategic alternatives.

Paulson & Co., the New York-based money-management firm run by the billionaire, held about 12 million Starwood shares as of June 30, valued at $973 million, according to a Form 13F filed with the U.S. Securities and Exchange Commission. Paulson didn’t report holding any Starwood shares in the prior quarter.