Back in 2012, activist investors Carl Icahn and Dan Loeb pressured Yahoo to sell half its stake in Alibaba Group Holding Ltd (NYSE: BABA). While meant to unlock shareholder value, the campaigns ultimately stunted continued returns.

Activist investor Carl Icahn's name is front and center in a $5.4-billion merger between two automotive component companies.

Nike Inc (NYSE: NKE) shares ticked lower Thursday afternoon following a Dow Jones report that Pershing Square Capital's Bill Ackman sold his high profile stake in the company ahead of third quarter results slated for after the close.

Herbalife Ltd. (NYSE: HLF) is up more than 40 percent in 2018, and investors can expect even more gains ahead, according to Citi.

For a brief moment, it seemed Xerox Corp (NYSE: XRX) might just get away with its Fujifilm merger unopposed.

The latest round of 13-F filings from institutional investors is out, revealing to the world the stocks that some of the richest and most successful investors have been buying and selling.

Xerox Corp (NYSE: XRX)'s plans to merge with Japan's Fujifilm Holdings is being questioned by two of Xerox's biggest shareholders, Carl Icahn and Darwin Deason.

The stock market is full of multiple "fault lines" that will ultimately lead to an "earthquake on Wall Street," according to Carl Icahn, one of Wall Street's biggest names and founder of Icahn Enterprises LP (NASDAQ: IEP).

Xerox Corp (NYSE: XRX) announced Wednesday a $6.1 billion merger with its Fuji Xerox joint venture — a deal never discussed with two of the firm’s largest shareholders, a company spokesperson

Pershing Square founder and CEO Bill Ackman updated the hedge fund's investors Monday after yet another difficult year.

Xerox Corp (NYSE: XRX) opened up 4 percent Monday after activist investors Carl Icahn and Darwin Deason announced their collaborative proxy battle with Xerox management.

Bill Ackman's Pershing Square hedge fund seems to be focused on future profits, according to a letter from the firm to shareholders sent earlier this month.

Bill Ackman’s massive $224 million bet on Chipotle Mexican Grill, Inc. (NYSE: CMG) may be down 33 percent in a little over a year, but Ackman’s most recent letter to Pershing Square investors assured them everything is going according to plan.

Bill Ackman is done talking about Herbalife Ltd. (NYSE: HLF).

Bill Ackman is as bullish as ever on Federal National Mortgage Association (OTC: FNMA) and Federal Home Loan Mortgage Corp (OTC: FMCC), but the two stocks' trading action this year suggests the market isn’t

The latest round of 13-F filings from institutional investors is out, revealing to the world the stocks that some of the richest and most successful investors have been buying and selling.

Bill Ackman's proxy battle against Automatic Data Processing (NASDAQ: ADP) didn't end well for the activist investor.

Activist hedge fund manager Bill Ackman was dealt another blow this week when he came out on the losing side of a proxy battle to place three Pershing Square representatives on the board of Automatic Data Processing (NASDAQ: ADP

Bill Ackman spoke on CNBC's "Fast Money Halftime Report" about Herbalife Ltd. (NYSE: HLF) and his recently restructured position, which he said now exists entirely in puts.

Bill Ackman said Monday that Chipotle Mexican Grill, Inc. (NYSE: CMG) is imminently fixable and he's hoping the company is going to recover.

Billionaire investor Bill Ackman's activist campaign against Automatic Data Processing (NASDAQ: ADP) has been well publicized and at times not so friendly.

Chipotle Mexican Grill, Inc. (NYSE: CMG) is again on the verge of a major technical breakdown.

Bill Ackman is facing some criticism for his activist campaign against Automatic Data Processing (NASDAQ: ADP) but true to his form, the billionaire isn't backing away from his thesis.

Billionaire activist investor Nelson Peltz thinks Procter & Gamble Co (NYSE: PG)'s current business strategy is flawed, and he has the answers.

This week, Pershing Square Capital’s Bill Ackman doubled down on his calls for change at Automatic Data Processing (NASDAQ: ADP), outlining a number of things he believes the company could do to unlock shareholder value.

Billionaire investor Bill Ackman's activist campaign against Automatic Data Processing (NASDAQ: ADP) is turning nasty, the company's CEO Carlos Rodriguez explained to CNBC's Jim Cramer.

Automatic Data Processing (NASDAQ: ADP) is a wildcard for investors after activist hedge fund manager Bill Ackman made the company his latest target.

Billionaire activist investor Bill Ackman made his activist case against Automatic Data Processing (NASDAQ: ADP) public