U.S. Hot Stocks: Hot Stocks to Watch

Among the companies with shares expected to actively trade in Tuesday's session are Marvell Technology Group Ltd. (MRVL) and Hertz Global Holdings Inc. (HTZ).

Private-equity firm KKR & Co. (KKR) reported a 6.8% stake in chip maker Marvell Technology and said it may engage in talks with management or stockholders, or take other actions to attempt to influence its corporate strategy. Shares rose 5.7% to $14.55 premarket.

Hertz has enacted a one-year shareholder-rights plan to prevent investors from gaining sizable control of the rental-car firm, a move the company attributed to "unusual and substantial" trading activity. Shares rose 4.2% to $27 premarket.

Shares of UniPixel Inc. (UNXL) slid after the touch sensor technology maker disclosed President and Chief Executive Reed Killion was resigning from those positions, effective immediately. The stock dropped 12% to $10.40 in premarket trading.

 
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Nasdaq OMX Group (NDAQ) will take a 5% equity stake in Borsa Istanbul A.S. as part of a deal that also includes technology-sharing and advisory services, the exchanges said Tuesday. Nasdaq will have the option to increase its stake in the Turkish entity by 2% and will receive a series of cash payments.

Warren Buffett's Berkshire Hathaway Inc. (BRKA, BRKB) is acquiring Phillips Specialty Products Inc. from energy and refining company Phillips 66 (PSX) in a stock deal valued at about $1.4 billion.

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