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Bill Ackman would be right to be worried about his Herbalife short following the company's decision to do a Dutch auction.

We all just witnessed the fall of a Wall Street god

OPINION: On Wall Street, the most powerful people can move the market with merely a word. Bill Ackman seems to have lost that ability.

A CEO says Bill Ackman told him he gets more ‘clicks on the internet’ than anyone except Donald Trump

Billionaire hedge fund manager Bill Ackman told the CEO of activist target ADP that he gets "more clicks on the internet" than anyone but Donald Trump.

Corporate raider Bill Ackman threatened his most recent target with negative media coverage

Hedge fund billionaire Bill Ackman is playing hardball with ADP in an attempt to grab board seats, threatening negative media coverage if they don't comply.

An ADP director has a relationship with the activist trying to shake it up — and it shows how messy Wall Street really is

Glenn Hubbard, the dean of Columbia Business School, sits on the board of ADP, a target of Bill Ackman's Pershing Square. Columbia and Pershing are close.

One stock helped decimate Bill Ackman’s hedge fund performance

Bill Ackman's hedge fund, Pershing Square Capital, invested in Valeant two years ago. That position has cost the fund dearly ever since.

Bill Ackman might score a big win at Chipotle

Bill Ackman took a 9.9% stake in Chipotle in September and is nearing a direct voice at the fast-casual chain.

One of the key men behind Bill Ackman’s bet on Valeant is leaving to launch a healthcare startup

Jordan Rubin, one of Pershing Square's analysts on Valeant, is leaving the activist hedge fund and plans to launch a healthcare startup.

‘The company is at risk of getting into a death spiral’: Bill Ackman’s emails reveal a wild relationship with Valeant

During its precipitous drop in October, hedge fund manager Bill Ackman was hounding Valeant Pharmaceutical's management.

Bill Ackman just cut back on his biggest bet

He first took a position in Mondelez in August. He said in the email that the company remains the fund's "largest exposure" even after the sale.

Bill Ackman is down more than $1 billion today

It's been a tough day for Bill Ackman.