Icahn's stake in Cigna amounts to less than 5 percent of outstanding shares, according to The Wall Street Journal. The activist investor plans to convince other shareholders to vote against the deal on Aug. 24, sources told the Journal.
Here is how financial pros, who manage hundreds of billions of dollars, organize their email.
These four market experts who manage billions of dollars talk about their pet peeves in the office.
The hedge fund manager spoke at the Delivering Alpha Conference in New York on Wednesday.
SandRidge Energy has a list of 26 potential buyers in line to acquire at least some of the company's assets.
SandRidge Energy said on Friday it had been approached by 17 potential bidders for a buyout.
Bill Ackman's hedge fund notched a double-digit gain in May, posting its second-best month since 2014.
Carl Icahn is building a small stake in pharmaceutical company Allergan, Bloomberg reported Wednesday, citing sources.
Carl Icahn is reducing his position in Herbalife.
Carl Icahn reveals the size of his position in VMware on CNBC's "Halftime Report" Monday.
CNBC's Scott Wapner speaks with Carl Icahn about his latest investments in Energen, Xerox and VMWare, a subsidiary of Dell Technologies.
CNBC's Scott Wapner discusses the future of Xerox with investor Carl Icahn.
Investor Carl Icahn discusses his decision to team up Keith Meister of Corvex and purchase 2 million shares of stock in Energen from Corvex with an option to purchase another 2 million.
Carl Icahn is joining his protege Keith Meister in a deal that may ultimately lead to their purchase of oil and gas producer Energen Corp.
AmTrust Financial Services shares jumped in after-hours trading Thursday after activist investor Carl Icahn disclosed a nearly 9.4 percent stake in the company.
Senators have asked Carl Icahn and EPA Administrator Scott Pruitt to explain how an Icahn-owned refinery secured a valuable exemption from the nation's biofuels law.
Carl Icahn and Darwin Deason, shareholders in Xerox who oppose an agreed deal with Fujifilm, said they would consider an all-cash bid of at least $40 per share.
Shares of CVR Energy have more than doubled since August, equal to a $1.4 billion gain on paper for lead shareholder Carl Icahn.
Newell Brands said on Friday it would sell its packaging business Waddington Group to Novolex, a company owned by buyout firm Carlyle Group, for about $2.3 billion.