Among the companies with shares expected to actively trade in Wednesday's session are Twitter Inc. (TWTR), Sprint Corp. (S), Humana Inc. (HUM) and Hess Corp. (HES).

Twitter reported Tuesday its second-quarter revenue more than doubled and the company saw an uptick in user growth, signaling its efforts to make the short messaging service more appealing to the masses may be bearing fruit. Shares surged 23.8% to $47.74 in premarket trading.

Sprint said it swung to a profit in its fiscal first quarter, as its operating expenses declined and it narrowed its loss of the most lucrative contract customers. Shares rose 3.3% to $8.26 in premarket trading.

Humana said its second-quarter profit fell 18% as a surge in benefit costs helped offset an increase in revenue. The company reaffirmed its full-year earnings guidance. Shares fell 4.3% to $121.99 premarket.

Hess said it plans to pursue a spinoff of some midstream assets, mostly in North Dakota, to create a separately traded company to support growth of its production in the Bakken oil shale. Shares gained 4.2% to $103.62 premarket.

Goodyear Tire & Rubber Co. (GT) reported a nearly 18% jump in its second-quarter profit as sales in North America, combined with some cost-squeezing in Europe, offset the economic weakness in other parts of the world. Shares dipped slightly to $27.50 premarket.

Southern Co. (SO) said its second-quarter earnings more than doubled amid stronger electricity sales and a year-earlier period than included one-time charges. Shared edged up to $44.95 premarket.

Carlyle Group L.P. (CG) said it swung to a second-quarter profit on a surge of private-equity deal profits, as the firm ramped up its buying and selling of companies. Shares were inactive premarket.

WellPoint Inc. (WLP) said its second-quarter profit slipped as the health insurer recorded higher expenses, masking a boost in revenue and enrollment. Still, the company again raised its earnings outlook for the year. Shares were inactive premarket.

Hospira Inc. (HSP) said its second-quarter profit more than doubled on higher sales. Results easily topped analysts' expectations. Shares were up 2.1% to $53.01 premarket.

Barclays PLC (BCS) is under renewed pressure in the U.S. after it disclosed Wednesday that authorities extended for two more years an agreement that essentially puts the bank on probation while the government looks into possible misconduct. The bank also reported it swung to a profit in its second quarter.

Booz Allen Hamilton Holding Corp. (BAH) said its fiscal first-quarter profit edged up 1.1%, even as the consulting company's revenue fell amid tepid spending from federal government clients.

Public Service Enterprise Group Inc. (PEG) said its second-quarter earnings fell 36% as the power company's operating revenue declined. The company said it expects full-year earnings at the upper end of its forecast.

Dominion Resources Inc. (D) said its second-quarter earnings declined 21%, dented by milder weather and one-time legislation-related charge.

Valero Energy Corp. (VLO) said its second-quarter profit rose 26% as the company's refining segment enjoyed higher volumes and operating income.

Lorillard Inc. (LO) said its second-quarter profit declined slightly as a drop in sales for the company's e-cigarettes offset a slight increase in sales for traditional cigarettes.

Rockwell Automation Inc. (ROK) said its fiscal third-quarter earnings fell 2% owing to tax impacts, while revenue growth at its architecture and software segment offset declines at its control-products unit.

Energizer Holdings Inc. (EZR) said its fiscal third-quarter earnings fell 26% as higher expenses masked an increase in revenue, though the company's household products segment posted lackluster sales.

Pfizer Inc. (PFE) agreed to acquire Baxter International Inc.'s (BAX) portfolio of marketed vaccines for $635 million.

Amazon.com Inc. (AMZN) said it will invest $1 billion to expand in India as competition for customers heats up in the South Asian e-commerce market.

 
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Aflac Inc.'s (AFL) second-quarter profit fell 8.8% as the insurance company was hit by lower revenue and a difficult exchange rate with Japan.

American Express Co.'s (AXP) second-quarter profit rose 9%, driven by a gain on the sale of half of its corporate-travel business and higher spending by cardholders.

Ameriprise Financial Inc.'s (AMP) second-quarter profit rose 16.5% as the financial-services company posted a strong performance in its advice and wealth-management unit.

Amgen Inc. (AMGN) said it plans to reduce its global workforce by 12% to 15% and close facilities in two states as part of a restructuring that aims to focus resources on developing new drugs.

Anadarko Petroleum Corp.'s (APC) second-quarter profit fell 76% on hedging impacts that masked the oil-and-gas company's stronger sales.

Buffalo Wild Wings Inc. (BWLD) reported strong results for the second quarter, but its net earnings forecast for the year fell short of the Street consensus.

DreamWorks Animation SKG Inc. (DWA) swung to a second-quarter loss as revenue dropped nearly 43% as the film studio continues to feel the fallout from recent flops. The company disclosed Tuesday the Securities and Exchange Commission is investigating the company's write-down on "Turbo," a summer 2013 film release.

Edwards Lifesciences Corp.'s (EW) second-quarter profit surged amid continued sales growth for the company's nonsurgical heart valves and a large one-time settlement-related gain.

Apartment developer Equity Residential (EQR) reported second-quarter normalized funds from operations at the high end of its guidance, saying demand for rental housing "remains exceptionally strong."

Express Scripts Holding Co.'s (ESRX) second-quarter profit fell 5.1% on lower revenue and higher expenses, including acquisition costs.

Carl Icahn's investor group trimmed its stake in Family Dollar Stores Inc. (FDO), a day after the discount retail chain agreed to an $8.5 billion buyout offer from rival Dollar Tree Inc. (DLTR).

Genworth Financial Inc.'s (GNW) second-quarter profit rose 25%, with the insurer reporting strong results from its mortgage business and a disappointing performance by its long-term care insurance business.

Global Payments Inc.'s (GPN) fiscal fourth-quarter profit rose 26.5% as the credit-card processor recorded a jump in revenue.

A unit of IAC/InterActive Corp. (IACI) reached a deal to buy test-preparation service The Princeton Review from Charlesbank Capital Partners, the companies said Tuesday.

Marriott International Inc.'s (MAR) second-quarter earnings rose 7.3% on an increase in revenue and on a key industry metric buoyed by stronger average daily room rates.

Newmont Mining Corp. (NEM) swung to a profit in the second quarter. The gold-mining company also said it plans to invest up to $1 billion in cash to develop the Merian gold mine in Suriname.

Nutrisystem Inc.'s (NTRI) second-quarter profit rose sharply as the weight-loss products company reported higher sales and double-digit new customer growth.

Panera Bread Co.'s (PNRA) second-quarter net profit slipped as higher costs masked an uptick in sales.

U.S. Steel Corp.'s (X) second-quarter loss narrowed as the company continues to cut costs amid a still-glutted global market.

Write to Tom Rojas at tom.rojas@wsj.com and Maria Armental at maria.armental@wsj.com

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