Shares of AOL, and Aetna Among Hot Stocks Feb. 1st, Inc. (NASDAQ:AMZN): The number of Amazon’s (NASDAQ:AMZN) employees surged 67% at the end of December 2011 to 56,200 workers, up from 33,700 one year earlier, according to Gigaom, which cited the company’s 8-K filing. Shares of, Inc. are trading 9.86% lower today.

AOL, Inc. (NYSE:AOL): Reports Q4 revenue $576.8M vs. consensus $572.98M. Reports Q4 advertising revenue $373.8M, up 10% y/y. Reports Q4 subscription revenue down 18% y/y to $194.6M. Shares of AOL, Inc. are trading 14.56% higher today.

Aetna Inc. (NYSE:AET): Total medical benefit ratio was 80.7% in Q4 and 79.6% for the full year. Shares of Aetna Inc. are trading 4.26% higher today.

Medivation, Inc. (NASDAQ:MDVN): Wedbush raised its estimates and price target for Medivation after the company reported positive AFFIRM results. The firm believes the results confirm MDV3100’s promise as a treatment for prostate cancer and keeps an Outperform rating on the stock. Shares of Medivation, Inc. are trading 17.6% higher today.

Want news like this in real-time so you can get an edge? Click here for Wall St. Cheat Sheet Pro.

To contact the reporter on this story: Derek Hoffman at

To contact the editor responsible for this story: Damien Hoffman at