After losing 61% of its value in 2011, Netflix has reversed that trend, Bloomberg reports. The company’s share prices have gained more than 40% in 2012 so far, according to the story.

With a one-day jump of 14% on Monday, the stock became the biggest gainer among S&P 500 index members, the story notes.

The shares rose on rumors of a buyout and prospects for subscriber growth among streaming customers both in the U.S. and internationally, according to Whitney Tilson, managing director of T2 Partners LLC.

A Netflix representative declined to comment on the buyout speculation.