Hedge Fund and Insider Trading News: David Tepper, Kevin Ulrich, Warren Buffett, Davidson Kempner, Woodson Capital Management, Rhenman & Partners Asset Management, iRobot Corporation (IRBT), Auryn Resources (AUG), and More

Dillard's stock surged as much as 42% on Monday, after Warren Buffett's deputy disclosed a nearly 6% stake in the ailing department-store chain.

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