Among the companies with shares expected to actively trade in Wednesday's session are Teva Pharmaceutical Industries Ltd. (TEVA) and Merrimack Pharmaceuticals Inc. (MACK).

Teva said President and Chief Executive Jeremy Levin will depart from the company after less than a year and a half at the helm. The Israel-based generic-drug maker said its board "has agreed" with Mr. Levin, who became CEO in May 2012, that he will step down from the post. Chief Financial Officer Eyal Desheh will serve as president and CEO on an interim basis, effective immediately. American depositary shares slipped 5% to $38.98 premarket.

Merrimack Pharmaceuticals said a Phase 2 study on its ovarian cancer treatment didn't meet the primary endpoint of progression free survival in the overall population. Shares were down 13% premarket at $2.95.

Exelon Corp.'s (EXC) third-quarter earnings surged as the nuclear-power producer benefited from positive hedging impacts and lower costs, helping results beat expectations. Shares edged up 1.7% to $28.53 premarket.

KaloBios Pharmaceuticals Inc. (KBIO) said the U.S. Food and Drug Administration granted orphan drug designation for its treatment for cystic fibrosis patients with Pseudomonas aeruginosa. Shares climbed 3.5% to $4.50 premarket.

Hess Corp.'s (HES) third-quarter earnings slid 25% as the oil-and-gas company's results were hurt by lower revenue and production amid asset sales, extended shutdowns and maintenance. Shares slid 1.8% to $82 premarket.

IAC/InterActiveCorp.'s (IACI) third-quarter profit more than doubled as the Internet company recorded stronger revenue, especially from its portfolio of online-dating websites. But shares slid 15% to $49.50 in premarket trading, as revenue growth missed Wall Street's expectations.

Yelp Inc. (YELP) posted a wider third-quarter loss while surging marketing costs helped obscure another double-digit revenue increase. Shares of Yelp declined 8.8% to $62.75 in premarket trading as the company's earnings came in lower than expected.

Buffalo Wild Wings Inc.'s (BWLD) third-quarter profit jumped 67% as the restaurant chain reported strong same-store sales and lower costs of traditional chicken wings. Shares jumped 8.5% to $140.50 in premarket trading, as top and bottom line results both exceeded expectations.

Amarin Corp. (AMRN) said the U.S. Food and Drug Administration has rescinded a special protocol assessment agreement for a study related to the biotechnology company's supplemental new drug application for its cholesterol drug Vascepa, which an FDA advisory committee voted against earlier this month. Shares tumbled 14% to $1.80 premarket.

Flextronics International Ltd.'s (FLEX) fiscal second-quarter profit slipped 21% on higher overhead costs and weaker margins, though the contract electronics manufacturer reported top-line growth for the first time in nearly two years. Shares slipped 4% to $8.50 premarket as the company issued a mostly weak outlook for the current quarter.

LinkedIn Corp. (LNKD), which has minted strong financial results and a soaring stock price since going public in 2011, warned of a sharp slowdown in the current quarter. The professional social network forecast fourth-quarter revenue to rise 37% to 38% from a year earlier. While most companies would envy that sort of growth, it would mark a downshift for LinkedIn, which said its third-quarter revenue grew 56%. Shares slid 4.2% to $236.75 premarket.

Western Union Co.'s (WU) third-quarter earnings fell 20% as the money-transfer company recorded a slight drop in revenue and an increase in expenses. The company also said it expects to add "significant additional investment" in compliance-related costs in 2014, in light of the current regulatory environment. Shares fell 19% to $15.55 premarket.

Shares of software networking provider Cyan Inc. (CYNI) slumped 18% to $6.48 premarket after the company issued a weaker-than-expected outlook for the fourth quarter.

Baidu Inc.'s (BIDU, K3SD.SG) third-quarter profit rose 1.3%, driven by a surge in revenue. American depositary shares of Baidu were up 6.6% to $170 in premarket trading as the company issued upbeat guidance for the fourth quarter.

 
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Aflac Inc.'s (AFL) third-quarter earnings fell 31% as impacts from a weaker yen continued to weigh on its core operations in Japan.

American Tower REIT's (AMT) third-quarter earnings fell 22% as the celltower owner posted higher expenses. The top line increased less than expected.

Ameriprise Financial Inc.'s (AMP) third-quarter profit more than doubled as the financial-services company and asset manager posted a double-digit increase in revenue amid growth across all business segments.

Automatic Data Processing Inc.'s (ADP) fiscal first-quarter earnings rose 7.6% as the payroll and benefits-administration company reported revenue growth across its segments. Results beat expectations.

Booz Allen Hamilton Holding Corp.'s (BAH) fiscal second-quarter earnings rose 47% as the consulting company benefited from cost controls that offset a modest decline in revenue. Results beat views, but the company lowered its revenue guidance for the year.

Boston Properties Inc.'s (BXP) third-quarter profit more than doubled as the office landlord reported a jump in base rent revenue, while a key metric known as funds from operations jumped.

Caesars Entertainment Corp.'s (CZR) third-quarter loss drastically widened as the casino operator reported sharply higher asset impairment charges and a slight decrease in revenue.

Coldwater Creek Inc. (CWTR) unveiled a cost-cutting plan that the women's apparel retailer said will trim corporate workforce expenses by about 20% and include an unspecified number of layoffs at the company.

Comcast Corp.'s (CMCSA, CMCSK) third-quarter profit dropped 18% as the cable operator reported weaker revenue, as prior-year results were bolstered by the 2012 Summer Olympics and asset-sale gains. The bottom line still beat expectations.

DreamWorks Animation SKG Inc.'s (DWA) third-quarter profit fell 59% as the computer-animation studio's film "Turbo" disappointed. The results, however, didn't decline as much as feared.

Edison International's (EIX) third-quarter profit more than doubled due to strength from its core operations.

Garmin Ltd.'s (GRMN) third-quarter earnings rose 34% as the personal-navigation-devices maker posted improved margins and a tax benefit, though sales continued to fall in its key automotive and mobile segment. Still, total revenue was better than analysts had expected and Garmin raised its full-year earnings guidance.

Genworth Financial Inc.'s (GNW) third-quarter earnings more than tripled as the life and mortgage insurer's year-ago quarter was weighed down by higher expenses.

Gilead Sciences Inc.'s (GILD) third-quarter earnings rose 17% on strong sales growth led by biopharmaceutical company's newer HIV drugs--Stribild and Complera.

Hyatt Hotels Corp.'s (H) third-quarter earnings more than doubled as the company's occupancy and average daily rates improved and as results were boosted by gains from the sale of real estate. The bottom line beat estimates.

Ixia (XXIA) said it had agreed to buy Net Optics Inc. in a $190 million all-cash deal in a bid to boost its network-monitoring portfolio.

Jones Group Inc.'s (JNY) third-quarter earnings climbed 68% as the footwear and apparel maker's interest expenses fell, though revenue and core earnings weakened. The adjusted bottom line still topped views.

Praxair Inc.'s (PX) third-quarter earnings improved 3.5% as new project start-ups helped boost the maker of industrial gases' revenue. But the top line missed expectations, and the company lowered the high end of its full-year earnings view.

PVH Corp. (PVH) unveiled a succession plan for its Tommy Hilfiger division, saying that long-term executive Daniel Grieder will take over as the lifestyle and apparel brand's chief executive by January 2015.

TE Connectivity Ltd.'s (TEL) fiscal fourth-quarter earnings fell 2.3% as the electronics components maker posted higher tax costs, though sales grew. Adjusted earnings beat the company's own forecast, but it gave a weak bottom-line view for the current quarter.

Universal Health Services Inc.'s (UHS) third-quarter profit rose 60% as the company's revenue grew and its acute-care facilities were boosted by a favorable Medicaid policy decision in Texas.

WebMD Health Corp.'s (WBMD) swung to a third-quarter profit as advertising demand continued to improve. The health-information provider also agreed to acquire Avado Inc., a developer of cloud-based patient-relationship tools. Financial terms of the deal weren't provided.

Patent-licensing firm Wi-Lan Inc. (WILN, WIN.T) said its board initiated plans to explore strategic options, including the possible sale of the company. "The company strongly believes in its current business strategy but does not believe that its current share price accurately reflects its strong balance sheet, the value of its signed license agreements, its business prospects or the residual value of its broad intellectual property portfolio," it said.

Yamana Gold Inc.'s (AUY, YRI.T) third-quarter profit dropped 28% as weaker metals prices and falling revenue again stung the Canada-based gold-mining company's results.

Write to Lauren Pollock at lauren.pollock@wsj.com

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