Among the companies with shares expected to trade actively in Tuesday's session are Baxalta Inc. (BXLT), Allstate Corp. (ALL) and Sprint Corp. (S) .

Dublin-based Shire PLC (SHPG, SHP.LN) said Tuesday that it has offered to acquirerare-disease treatment maker Baxalta Inc. (BXLT) for roughly $30.6 billion in stock, in the latest example of a foreign company using its tax-friendly status to goafter a U.S. company. Baxalta shares rose 17% to $38.85 in recent trading. Shire's American depositary shares fell 3.4% to $259.01.

Allstate Corp. (ALL) said its second-quarter operating earnings fell 41% on lower auto insurance margins and seasonally high catastrophe losses. Shares fell % to $ premarket. Shares fell 7.1% to $64.45.

Sprint Corp. (S) announced Monday a reshuffle among senior management as Chief Executive Marcelo Claure tries to turnaround the struggling wireless provider. Shares rose 10% to $3.69.

Aetna Inc. (AET), which has agreed to buy fellow insurer Humana Inc., reported better-than-expected earnings for its second quarter as it benefits from growthin its government business. The company also raised its earnings outlook. Shares rose 1.9% to $115.94.

Archer Daniels Midland Co. (ADM) said its earnings fell more than expected in the second quarter, as record ethanol production limited profits. Shares rose/fell % to $ premarket. Shares fell 2.1% to $46.70.

Coach Inc. (COH) said profit plunged in its latest quarter as the luxury retailer reported deteriorating sales and restructuring-related charges. But results beat expectations and the company issued upbeat guidance for the newly-started business year. Shares rose 4.8% to $31.90.

Chinese online travel company eLong Inc. (LONG) has received a takeover offer from its shareholder Tencent Holdings Ltd. (TCEHY, 0700.HK), the latest move in a sector that has seen an abundance of deal activity. eLong shares fell 17% to $16.70 .

Starboard Value LP, which last year scored bragging rights among so-called activist investors by unseating Darden Restaurant Inc.'s board, is now calling on MedAssets Inc. (MDAS) to overhaul operations--and its board. MedAssets shares fell 7.6% to $21.80 .

Shares of TriNet Group Inc. (TNET) tumbled after the human-resources provider on Monday reported disappointing results, citing a higher-than-expected number of large medical claims. Shares fell 34% to $17.40.

Regeneron Pharmaceuticals Inc. (REGN) , which recently won approval for its cholesterol drug, said profit doubled in its second quarter as sales of itseye-disease treatment surged. Shares rose 6.3% to $588.99.

Animal-health company Zoetis Inc. (ZTS) swung to a second-quarter loss oncosts related to its restructuring plans, though revenue and adjusted profit topped expectations as sales of its pet and livestock medicines grew. The company also boosted the low end of its 2015 outlook. Shares rose 3.2% to $50.04.

American International Group Inc. (AIG) boosted its common-stock dividend by 124% and raised its share-repurchase target by $5 billion, signs of health that seemed unfathomable seven years ago when it nearly collapsed into bankruptcy.

Avis Budget Group Inc. (CAR) reported disappointing revenue for the June quarter and lowered its fiscal year outlook, citing weak pricing and the stronger dollar.

Community Health Systems Inc. (CYH) raised its earnings guidance for the year as its second-quarter profit more than doubled thanks to its acquisition of Health Management Associates Inc.

CVS Health Corp. (CVS) on Tuesday gave a soft earnings outlook forits current quarter, while growing sales of prescription drugs continued to offset weakness in its retail business for the second quarter.

General Growth Properties Inc. (GGP) said second-quarter funds from operations increased as initial rental rates and tenant sales increased.

J.C. Penney Co. (JCP) has hired executives from Home Depot Inc. and Target Corp. to strengthen its online offerings.

The latest management appointment comes as Marvin Ellison--a veteran of both retailers--took over as J.C. Penney's new chief executive on Aug. 1, succeeding Myron "Mike" Ullman III. Mr. Ullman is staying on at J.C. Penney as executive chairman.

Kellogg Co. (K) said its second-quarter earnings fell 24% as sales abroad were hurt by a stronger U.S. dollar and weak domestic demand for cereal and other packaged foods.

Vornado Realty Trust's (VNO) second-quarter profit nearly doubled following its shopping centers' spinoff.

Zillow Group Inc.'s (Z) chief operating officer, Kathleen Philips, is stepping into the chief financial officer role, three weeks after the resignation of the company's finance chief. The move is effective Aug. 7.

Write to Maria Armental at maria.armental@wsj.com and Tess Stynes at tess.stynes@wsj.com

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