Among the companies with shares expected to actively trade in Tuesday's session are GenMark Diagnostics Inc. (GNMK), Rambus Inc. (RMBS) and Korn/Ferry International (KFY).

GenMark lowered its revenue guidance for the year, citing uncertainties from the maker of molecular diagnostic testing systems's largest customer as well as challenges affecting the emerging pharmacogenomics market. Shares slipped 4.7% to $10.45 after hours.

Rambus lifted the low end of its second-quarter revenue forecast and also said it has expanded existing agreements with STMicroelectronics NV (STM). Shares of Rambus, which licenses technology used to accelerate the performance of memory, rose 3.8%, to $8.91 after hours.

Korn/Ferry's fiscal fourth-quarter earnings rose slightly as the executive-search company's revenue growth, which was mostly driven by recent acquisitions, also was mostly offset by a related increase in expenses. Still, shares were up 4.7%, at $18.96 in after-hours trading, as the company gave a mostly upbeat view for the fiscal first quarter.

Exact Sciences Corp. (EXAS) plans to offer an undisclosed amount of shares with the intention of using the net proceeds for general corporate and working-capital purposes. The molecular-diagnostics company had about 64.1 million shares outstanding as of March 31. Shares slid 2.9% to $12.23 after hours.

New Mountain Finance Corp. (NMFC) is offering six million shares, four million of which are being sold on behalf of a selling stockholder, New Mountain Finance AIV Holdings Corp. The management-investment company had more than 31.3 million shares outstanding before the offering. Shares were off 3.2% to $14.40 after hours.

Repros Therapeutics Inc. (RPRX) intends to sell up to three million shares of its common stock. The company had more than 18.6 million shares outstanding before the offering. Shares fell 2.4% to $17.50 after hours.

Ship Finance International Ltd. (SFL) said it intends to sell eight million shares and use the net proceeds to invest in new assets within the shipping and offshore sectors, and for general corporate purposes and working capital. The company, which owns and charters out large vessels that transport crude oil, had about 85.3 million shares outstanding before the offering. Shares slipped 5.6% to $16.35 after hours.

 
    Watchlist: 

Ares Commercial Real Estate Corp. (ACRE) said it plans to offer 18 million shares as the specialty-finance company looks to raise funds to invest in target investments, repay debt and for other general corporate purposes. It had 9.3 million shares outstanding as of May 14.

Emcor Group Inc. (EME) has agreed to buy privately held RepconStrickland Inc., an industrial and refinery service company, in a roughly $455 million cash deal to strengthen its position in the growing sector.

Jack in the Box Inc. (JACK) said it plans to close 67 company-operated Qdoba Mexican Grill restaurants by the end of the fiscal year as the restaurant operator looks to focus on its core markets.

Germany's biggest cable operator Kabel Deutschland Holding AG (KD8.XE, KBDHY) confirmed it has received a proposal to be acquired by Liberty Global PLC (LBTYA), potentially creating a bidding feud between John Malone's international cable company and Vodafone Group PLC (VOD.LN, VOD).

Smithfield Foods Inc. (SFD) said it will review a letter from a major investor that is pressuring the pork producer to explore a breakup instead of following through with its planned takeover by Shuanghui International Holdings Ltd., but said it continues to believe the proposed merger is in the best interest of the company and its shareholders.

Sprint Nextel Corp. (S) has filed a lawsuit against Dish Network Corp. (DISH) and Clearwire Corp. (CLWR) in an effort to block the satellite-TV provider's tender offer for Clearwire.

Steel Dynamics Inc. (STLD) forecast second-quarter earnings below analyst expectations as weaker prices pressured the steel maker's margins.

Tesoro Corp. (TSO) said Monday it struck a deal to sell its idled Kapolei refinery and other assets in Hawaii to a subsidiary of Par Petroleum Corp. (PARR) for $325 million.

Valeant Pharmaceuticals International Inc. (VRX, VRX.T) said it aims to raise $1.75 billion in a sale of its common shares to help fund its planned $8.7 billion acquisition of global eye-care company Bausch & Lomb Holdings Inc.

Write to Nathalie Tadena at nathalie.tadena@dowjones.com

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