Among the companies with shares expected to actively trade in Wednesday's session are AT&T Inc. (T), Boeing Co. (BA) and Delta Air Lines Inc. (DAL).

Amgen Inc. (AMGN) said its first-quarter earnings fell 25% on higher costs that masked the biopharmaceutical company's revenue growth. Shares dropped 2.6% to $116.15 premarket.

AT&T sales rose to start the year, as the carrier added more subscribers and increasingly sold mobile devices like the iPhone at full price. But profit declined due to higher taxes. Shares declined 2.5% to $35.38 premarket.

Boeing said its first-quarter earnings fell 13% as costs tied to changes to its retirement plans masked the continued strong demand for its jetliners. Shares edged up 2.3% to $130.50 premarket as the results beat expectations and the company raised its earnings guidance.

Cree Inc. (CREE) said its fiscal third-quarter earnings climbed 27% on higher sales of its lighting bulbs. Shares declined 7.4% to $53.75 premarket as the company's outlook was mostly below views.

Delta said first-quarter earnings surged, with higher revenue and passenger demand. The big U.S. airline's financial improvement came despite the fact it cancelled more than 17,000 flights due to severe weather in January and February. Earnings beat expectations, pushing shares up 5.6% to $36.89 premarket.

Dow Chemical Co. (DOW) said first-quarter earnings rose 65% on modest revenue growth and a boost from lower costs. Earnings beat expectations, and shares edged up 2% to $49.90 premarket.

Gilead Sciences Inc. (GILD) reported nearly $2.3 billion in first-quarter sales for its new hepatitis C treatment Sovaldi in what is believed to be the best-selling prescription drug launch in history. Shares climbed 3.6% to $75.45 premarket.

Illumina Inc. (ILMN) swung to a first-quarter profit, as the gene-sequencing company recorded a sharp increase in revenue. The company also raised its outlook for the year, pushing shares up 7.4% to $158.93 premarket.

Intuitive Surgical Inc. (ISRG) said its first-quarter earnings fell 77% on a steep decline in sales of its da Vinci robotic-surgery systems. Shares dropped 8.9% to $384.69 premarket.

Shares of Sanmina Corp. (SANM) jumped in after-hours trading Tuesday as the electronics manufacturer posted better-than-expected results for the fiscal second quarter. Sanmina also issued rosy outlook targets for the current quarter, pushing shares up 9.5% to $20 premarket.

Skechers USA Inc.'s (SKX) first-quarter profit soared as the footwear company reported broad sales growth in the U.S. and abroad, while also striking a bullish tone about demand later this year. The latest period's results easily topped Wall Street's expectations. Shares climbed 12% to $41.38 premarket.

Skyworks Solutions Inc.'s (SWKS) shares rose Tuesday after the wireless-chip supplier reported better-than-expected fiscal second-quarter profit and revenue growth. Shares climbed 8.8% to $41.30 premarket.

Shares of Super Micro Computer Inc. (SMCI) jumped 17% to $22.09 premarket after the servers maker reported better-than-expected profit and sales growth for the fiscal third-quarter. Super Micro also issued a rosy outlook for the fiscal fourth quarter.

Yum Brands Inc.'s (YUM) first-quarter profit rose 18%, as the parent company of KFC, Taco Bell and Pizza Hut recorded improved sales in China. Yum's earnings topped Wall Street's expectations, pushing shares up 2.9% to $79.72 premarket.

 
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Discover Financial Services (DFS) said its first-quarter profit slipped 6.2% as the credit-card company recorded higher expenses, masking an increase in total loan growth. Still, per-share earnings topped Wall Street's estimates for the company.

Juniper Networks Inc.'s (JNPR) first-quarter profit grew 22% as the networking-equipment company reported broad sales growth.

Nabors Industries Ltd. (NBR) said its first-quarter earnings fell 50% as the weather contributed to a loss in its division that prepares wells once they are drilled to start producing oil and natural gas for the long haul.

Packaging Corp.'s (PKG) earnings climbed 44% and revenue nearly doubled, boosted by a full quarter's operation of packaging and paper products company Boise Inc.

Procter & Gamble Co. (PG) said its third-quarter profit rose 1.7% as expenses fell, though sales also dropped slightly as most of the consumer-products giant's segments suffered sales declines. Core earnings topped analysts' expectations.

Stericycle Inc. (SRCL) said it has acquired PSC Environmental Service for about $275 million from private-equity firm Lindsay Goldberg LLC, as the medical waste management company looks to bolster its service offerings.

TD Ameritrade Holding Corp. (AMTD) said its fiscal second-quarter profit jumped 35% as the online brokerage benefited from higher fee revenue. The results topped analysts' expectations.

Vornado Realty Trust (VNO) said Tuesday the first-quarter profit it will record from its stake in Toys "R" Us will be completely offset by an impairment loss.

Write to John Kell at john.kell@wsj.com

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