Among the companies with shares expected to actively trade in Wednesday's session are Frontline Ltd. (FRO, FRO.LN), Jos. A. Bank Clothiers Inc. (JOSB) and Dycom Industries Inc. (DY).

Frontline's second-quarter loss narrowed amid one-time gains as the oil tanker company's operating expenses also declined. Shares slid 7.9% to $3.40 in premarket trading as results markedly missed Wall Street expectations.

Jos. A. Bank's fiscal second-quarter profit climbed 13% as the men's apparel retailer saw a double-digit revenue growth buoyed by its direct marketing sales, although margins narrowed amid rising input costs. Shares rose 11% to $46.30 in premarket trading as results comfortably beat Wall Street expectations.

Dycom's fiscal fourth-quarter earnings rose 2.5%, but the telecommunications contractor's results missed analyst expectations. Shares fell 15% to $16.10 in premarket trading.

Under pressure from investors unhappy with the health insurer's performance and direction, WellPoint Inc. (WLP) Chief Executive Angela Braly resigned Tuesday, and the company's board said it would begin a search for a permanent replacement. Shares rose 4% to $59.70 premarket.

Fresh Market Inc.'s (TFM) fiscal second-quarter earnings jumped 27% as the specialty grocer continued its streak of strong same-store sales growth, and also saw its margins widen. The results beat Wall Street expectations and the company raised its full-year outlook, sending shares 5% higher to $64.76 premarket.

Shares of online review site Yelp Inc. (YELP) fell 5% to $17.35 in premarket trading as 52.7 million shares will be freed up Wednesday, marking the end of a 180-day lockup period for early investors and insiders including Chairman Max Levchin and Chief Executive Jeremy Stoppelman, according to a filing with the Securities and Exchange Commission.

Joy Global Inc.'s (JOY) fiscal third-quarter earnings rose 12% as the mining equipment maker's revenue and margins improved, but bookings continued to decline. Shares fell 2.2% to $51.90 in premarket trading as earnings missed Wall Street estimates and the company trimmed its full-year earnings and revenue outlook. Joy says weaker economic growth has slowed global demand for commodities and recent output increases have created surpluses that are depressing prices.

Genesco Inc. (GCO) swung to a fiscal second-quarter profit as the seller of hats and footwear posted stronger sales and fewer one-time charges. Shares rose 3.3% to $73.53 in premarket trading as the company also unveiled a new stock repurchase authorization and raised its outlook for the fiscal year.

Oppenheimer boosted its rating on Angie's List Inc. (ANGI) to outperform from perform citing beliefs that the online review site can deliver multi-year EBITDA growth even if consumer marketing slows, and that volatility should ease now that time has passed since its lock-up expiration Aug. 14. Shares rose 4.8% to $9.46 premarket.

Chile's Sociedad Quimica y Minera de Chile S.A. (SQM, SQM-B.SN), which produces specialty fertilizers, second-quarter earnings rose 45%, sending shares 2.4% higher to $61.40 premarket as results beat expectations.

 
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Standard & Poor's Ratings Services placed Costco Wholesale Corp. (COST) on review for a potential upgrade, citing the wholesale-club operator's strong profitability and debt-reduction efforts.

A ruling on how much Morgan Stanley (MS) will pay Citigroup Inc. (C) to increase its stake in their Morgan Stanley Smith Barney wealth-management venture will be delayed until Sept. 10.

H.J. Heinz Co.'s (HNZ) fiscal first-quarter earnings rose 14% as the company benefited from reduced overhead expenses, improved margins and a lower effective tax rate, though negative currency impacts masked improvement in sales volume and pricing. The packaged-food company's earnings beat expectations.

Sealed Air Corp.'s (SEE) Chief Executive William V. Hickey plans to retire from the plastic-packaging company in March, and Dow Chemical Co. (DOW) veteran Jerome A. Peribere was named as his successor.

Spectrum Pharmaceuticals Inc. (SPPI) said the Federal Trade Commission has cleared its acquisition of Allos Therapeutics Inc. (ALTH), a deal that will boost the company's hematology franchise.

Standard & Poor's Ratings Services placed its credit ratings for Washington Post Co. (WPO) on watch for a possible downgrade, noting the deterioration at the company's higher education and newspaper divisions is expected to continue.

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

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