Among the companies with shares expected to actively trade in Tuesday's session are Dole Food Co. (DOLE), Lululemon Athletica Inc. (LULU) and Corinthian Colleges Inc. (COCO).

Dole Chairman and Chief Executive David H. Murdock has offered to buy out the fruit-and-vegetable producer in a deal that values Dole at roughly $1.5 billion. Mr. Murdock--Dole's largest shareholder with about 40% of stock outstanding--has offered to pay $12 per Dole share, an 18% premium to Monday's close. Shares rose 24% to $12.66 premarket.

Lululemon said Monday that Chief Executive Christine Day will step down after her successor is found. The announcement comes three months after the company was embarrassed by a recall of yoga pants because the fabric was too see-through. Shares tumbled 15% to $70.20 premarket.

Corinthian Colleges said it is under investigation by the U.S. Securities and Exchange Commission, and has received a subpoena for records related to recruitment, student-loan defaults and other matters. Shares slumped 14% to $2.39 premarket.

Health insurer Cigna Corp. (CI) has decided to expand its relationship with pharmacy-benefit manager Catamaran Corp. (CTRX) through a new 10-year deal that Cigna said will combine the two companies' drug-purchasing scale while adding to the insurers' earnings. Catamaran's shares climbed 13% to $55.00 premarket.

Questcor Pharmaceuticals Inc. (QCOR) acquired rights to develop Synacthen and Synacthen Depot in the U.S. from Novartis AG (NVS, NOVN.VX) in a deal valued at least $135 million, expanding the biopharmaceutical company's presence in treatments for inflammatory and autoimmune disorders. Questcor shares rose 17% to $43.00 premarket.

CardioNet Inc. (BEAT) has signed a three-year deal allowing its wireless medical devices to be covered by UnitedHealthcare Group Inc. (UNH). Shares of CardioNet soared 42% to $4.55 premarket.

LDK Solar Co. (LDK) slightly widened its fiscal first-quarter loss as the Chinese solar-wafer maker logged wafer shipments below expectations, along with a double-digit percentage slump in revenue. American depositary shares fell 13% to $1.43 premarket.

Crosstex Energy L.P. (XTEX) is offering 6 million units representing limited partner interests. The company plans to use the proceeds in part for capital expenditures, including for the expansion of its Cajun-Sibon natural gas liquids pipeline. Units slipped 5.4% to $19.96 premarket.

Diamond Foods Inc.'s (DMND) fiscal third-quarter loss narrowed as the embattled snack-and-nut company's margins improved, though nut sales weakened. Still, Diamond reported a surprise adjusted profit and revenue beat analysts' expectations. The company also appointed Raymond P. Silcock as its new chief financial officer. Shares were up 2.1% to $17.91 premarket.

Canadian mining company Kinross Gold Corporation (KGC, K.T) said Monday it will pull out of Ecuador after failing to reach a final agreement with the government of President Rafael Correa on the Fruta del Norte deposit. Shares slipped 5.5% to $5.97 premarket.

Excel Maritime Carriers Ltd. (EXM) reached a debt restructuring agreement with senior lenders that will also give the dry bulk carrier up to a $50 million capital infusion and access to previously restricted cash. Shares dropped 14% to 40 cents in light premarket trading as Excel said it and certain subsidiaries will implement the restructuring through a court supervised prepackaged plan of reorganization.

 
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Bright Horizons Family Solutions Inc. (BFAM) said certain shareholders intend to offer 8.5 million shares. The child-care services provider won't receive proceeds from the offering.

General Mills Inc. (GIS) raised its 2013 guidance and reiterated its expectations for the next fiscal year.

Himax Technologies Inc. (HIMX) said its shareholder Innolux Corp. (3481.TW) is offering 22.1 million of its American depositary shares. Himax, which makes semiconductors for flat-panel screens, won't receive any proceeds from the sale.

Navistar International Corp.'s (NAV) second-quarter loss swelled from higher warranty expenses on truck engines and a 34% drop in sales of trucks as the company switched it treatment system for diesel engine exhaust.

Oneok Inc. (OKE) said it will exit the energy-services business, resulting in a writedown and lower-than-expected income for the full year.

Pep Boys-Manny Moe & Jack's (PBY) first-quarter profit more than tripled as the auto-care company benefited from a large tax benefit. However, per-share earnings missed analysts' expectations.

Texas Instruments Inc. (TXN) narrowed its second-quarter profit and revenue outlook.

Recreational-vehicle maker Thor Industries Inc. (THO) has named Bob Martin, currently president and chief operating officer, as its new chief executive officer, effective Aug. 1.

Timken Co. (TKR) said it is considering spinning off its steel business, a move urged by an activist investor and supported by shareholders.

United Continental Holdings Inc.'s (UAL) consolidated traffic fell 0.8% in May, as the carrier's capacity also declined.

Write to Anna Prior at anna.prior@dowjones.com

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