Market Overview

Ackman Vs. Icahn

Following the release of its Q4 results, eBay Inc (NASDAQ: EBAY) announced an expansion to its Board of Directors and a standstill agreement with investor Carl Icahn on Wednesday.

Investor Carl Icahn on Thursday appeared on CNBC and discussed a number of topics, beginning with oil.

Speaking to Benzinga, Hedge Fund Manager and Lemelson Capital Management Founder Rev. Emmanuel Lemelson said that he thinks Pershing Square Capital Management CEO Bill Ackman is right about Herbalife Ltd. (NYSE: HLF).

“It’s very, very clearly a pyramid scheme,” he said.

Herbalife Ltd. (NYSE: HLF) is down nearly 50 percent over the past six months, but is up more than 3 percent on Thursday.

The company is also involved in quite the debate with hedge fund manager Bill Ackman.

Herbalife Ltd. (NYSE: HLF) on Wednesday called the latest comments by activist investor Bill Ackman a single-purpose "tirade" intended to drive down its share price.

Pershing Square was recently crowned with the coveted title of the best performing hedge fund of 2014 by Bloomberg. Pershing Square’s boss, Bill Ackman, was on CNBC discussing the benefits of activist investing.

Activist investor Bill Ackman disclosed an 18.8 percent stake in Restaurant Brands International Inc. (NYSE: QSR) Monday, sending shares up more than 4 percent in the extended session.

In an article on The Street, Doug Kass detailed a list of 15 surprise predictions for the coming year.

Carl Icahn reported a 7.77 percent stake in Manitowoc Company Inc (NYSE: MTW) Monday and called for the break up the company.

Activist investor Carl Icahn on Monday disclosed a 7.7 percent stake in Manitowoc Company Inc (NYSE: MTW).

Activist investor Carl Icahn disclosed a 7.7 percent stake in Manitowoc Company Inc (NYSE: MTW) on Monday, according to a 13D filing.

In the past, transparency between billionaires and the average-Joe was considerably cloudier than today.

Twitter has changed that.

So, who are the best billionaires to follow on the platform? That's up to the individual user. But here's 15 to keep an eye on.

Twitter is all about following the right people. And for investors, a newsfeed that follows a handful of hedge fund managers could be useful.

1. Carl Icahn - @Carl_C_Icahn

Goldman Sachs added Hologic, Inc. (NASDAQ: HOLX) to its Conviction Buy list on Thursday, raising its price target from $30.00 to $33.00. The stock reacted positively to the news and rose more than 2 percent on Thursday.

More consolidation is coming for the rail industry, according to activist investor Bill Ackman, who has previously made similar assertions since his Pershing Square hedge fund won control of Canadian Pacific Railway Limited (USA) (NYSE: CP) in 2012.

McDonald's Corporation (NYSE: MCD) extended its gains Wednesday on a rumor that activist investor Bill Ackman was building a stake in the fast-food giant. Asked about the rumor, the company told CNBC that it "welcomes investment," but didn't offer more specific comment.

Team Icahn

Team Ackman