Among the companies with shares expected to actively trade in Wednesday's session are Whole Foods Market Inc. (WFM), Symantec Corp. (SYMC) and WebMD Health Corp. (WBMD).

Whole Foods Market's fiscal second-quarter profit rose 20% as the supermarket chain reported a jump in sales, while also announcing a two-for-one stock split. Shares rose 8.6% to $100.73 in after-hours trading as earnings beat Wall Street estimates and its profit margin didn't decline as executives had previously warned.

Symantec's fiscal fourth-quarter earnings fell 66% amid restructuring-related expenses and other items, masking revenue growth and rising operating margins at the security-software maker. The company also initiated a quarterly dividend of 15 cents. Shares slipped 6.2% to $23.55 in after-hours trading.

WebMD's chief executive stepped down after less than a year in the post, while the online health-information provider said it was in talks to acquire or partner with other companies. Shares in the company rose 15% to $29.42 after hours, as it also narrowed its first-quarter loss, raised its full-year guidance and gave a second-quarter outlook above expectations.

Pioneer Natural Resources Co. (PXD) is proposing to buy all the outstanding shares of Pioneer Southwest Energy Partners LP (PSE) it doesn't already own through a stock-for-unit exchange that values the company at about $1.1 billion. Shares of Pioneer Southwest, a Delaware-limited partnership headquartered in Dallas, Texas, jumped 19% to $31.10 after hours.

 
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C.H. Robinson Worldwide Inc.'s (CHRW) first-quarter earnings edged down 3% as the transportation and logistics company posted higher costs that masked a rise in revenue.

CA Inc. (CA) Chief Executive Mike Gregoire vowed to expand his company's customer base after the information-technology company reported its fourth straight quarterly sales decline and warned of continuing weakness through the rest of its fiscal year. The Islandia, N.Y., software maker also said it will cut about 1,200 jobs and consolidate development sites to focus on higher-priority products and streamline its sales force, though CA said it will "backfill" many of those positions in other areas.

Electronic Arts Inc. (EA) is expecting a healthy bump in the holidays, though its current quarter looks to be a tough one. The Redwood City, Calif., game maker, which reported fourth-quarter results Tuesday, said it expects earnings for its coming 2014 fiscal year to be $1.20 a share when adjusted for deferred revenue from some games, among other items. That is well ahead of analyst expectations of $1.10 a share.

Williams Cos. (WMB) first-quarter earnings fell 62% and gas pipeline owner Williams Partners L.P.'s (WPZ) profit fell 21%, as both were hurt by weaker natural-gas liquids margins. Williams Cos. also lowered its 2013 per-share earnings estimate, citing weaker margins that reflect higher natural-gas price and lower natural-gas-liquids price assumptions. It now projects 73 cents a share, from its previous outlook of 75 cents to $1.15.

Write to Debbie Cai at debbie.cai@dowjones.com

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