Among the companies with shares expected to actively trade in Friday's session are Amazon.com Inc. (AMZN), Cytokinetics Inc. (CYTK) and Visa Inc. (V).

AbbVie Inc.'s (ABBV) first-quarter earnings edged up 1.2% on continuing strong sales of arthritis drug Humira. Results beat expectations, pushing shares up 1.9% to $50.25 premarket.

Amazon.com reported another quarter of skimpy profits, despite better-than-expected revenue growth, as the Web-commerce giant spent heavily on shipping, cloud computing and other initiatives. Shares slid 5.1% to $320 premarket.

Baidu Inc. (BIDU) said its first-quarter revenue rose 59%, topping expectations, driven by growth in the company's core search business. Shares climbed 3.8% to $165.88 premarket.

Broadcom Corp. (BRCM) said its first-quarter profit fell 14% as the chip maker's revenue and product margin slipped, sending shares down 4.4% to $29.78 premarket.

Shares of CalAmp Corp. (CAMP) slid 12% to $21.71 premarket after the wireless and satellite communications company issued outlook for the fiscal first quarter that missed Wall Street's expectations.

Shares of Clean Harbors Inc. (CLH) jumped 6.1% to $61.54 premarket after an activist shareholder disclosed a stake in the waste-disposal company and lamented what it described as undervalued shares.

Biopharmaceutical company Cytokinetics said a clinical trial of its drug to treat amyotrophic lateral sclerosis, or ALS, failed to reach its primary efficacy goal, and a secondary efficacy analysis produced mixed results. Shares plunged 61% to $5.06 in premarket trading.

DTE Energy Co. (DTE) said its first-quarter earnings jumped a better-than-expected 39%, as the energy company's utilities posted sharply higher results amid harsh winter weather. Chief Executive Gerard M. Anderson said "extremely cold weather" during the quarter "drove exceptionally high energy demand." Shares rose 1.8% to $78.50 premarket.

Lear Corp. (LEA) said its first-quarter profit rose 12% as the automotive-seating and electric-systems company posted strong sales growth in Europe, Africa and Asia. The company increased its full-year revenue projections, pushing shares up 2.5% to $87 premarket.

Marketo's (MKTO) shares jumped 7.8% to $31 premarket after the marketing software company reported better-than-expected results for the latest quarter and issued rosy outlook targets.

Microsoft Corp. (MSFT) posted a smaller-than expected decline in profit in its fiscal third quarter, buoyed by sales strength in its consumer segment and a decline in operating expenses. Shares edged up 1.5% to $40.45 premarket.

Pandora Media Inc.'s (P) fiscal first-quarter loss narrowed as the Internet-radio provider reported a sharp jump in advertising and subscription revenue that outpaced content costs. But the number of active listeners fell short of what Wall Street expected, pressuring shares, which were down 6.4% at $26.41 premarket.

Starbucks Corp. (SBUX) reported higher earnings for its fiscal second quarter as customers continued to indulge in specialty coffees and baked goods. Shares edged up 1.7% to $72.26 premarket.

Touchscreen-technology company Synaptics Inc. (SYNA) swung to a fiscal third-quarter loss as costs associated with the company's acquisition of a fingerprint sensor company masked a jump in revenue. But the company gave a strong revenue outlook for the current quarter and boosted its top-line view for the year. Shares climbed 9.4% to $70 premarket.

Visa said quarterly earnings rose 26% on higher operating revenue and payments volume, noting that spending trends have shown further improvement in the first three weeks of April. But the company said the year's revenue growth is now seen coming in at the low end of prior guidance, pushing shares down 4.3% to $200.40 premarket.

Weatherford International Ltd. (WFT) swung to a first-quarter loss as the oil-field services company recorded severance and exit costs associated with its restructuring plan and workforce cuts. Shares edged up 3.8% to $19.10 premarket.

Whirlpool Corp. (WHR) said its first-quarter sales rose, driven by gains in most of the company's regions. Earnings, though, missed analysts' expectations, pushing shares down 6.3% to $145 premarket.

 
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American Electric Power Co. (AEP) said its first-quarter earnings climbed 54% thanks to higher demand for energy and increased power prices. Results beat expectations, and the company increased its 2014 earnings guidance.

Burger King Worldwide Inc. (BKW) said its first-quarter earnings climbed 69% as the fast-food chain reported a sharp drop in company restaurant expenses masked a decline in revenue. Earnings slightly beat expectations.

Colgate-Palmolive Co. (CL) said its first-quarter earnings fell 16% as the consumer-products company recorded a charge tied to Venezuela's moves related to the exchange rate for foreign investments, masking a slight increase in sales that narrowly topped expectations.

Prestige Brands Holdings Inc. (PBH) on Friday said it has reached a deal to buy Insight Pharmaceuticals Corp. for $750 million in cash. Insight markets and distributes feminine care and other over-the-counter healthcare products such as the Monistat brand of yeast infection treatments and EPT home pregnancy tests.

Wet Seal Inc. (WTSL) said it will begin winding down its Arden B brand. By the start of the back-to-school season in late July, the company said it expects to have transitioned 31 Arden B stores to Wet Seal Plus merchandise, and the remaining 23 locations to regular Wet Seal merchandise.

Write to John Kell at john.kell@wsj.com and Lauren Pollock at lauren.pollock@wsj.com

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