Among the companies with shares expected to actively trade in Friday's session are JA Solar Holdings Co. (JASO) and Zumiez Inc. (ZUMZ).

Diamond Foods Inc. (DMND) raised its earnings guidance for the year, as strong performance from its Kettle U.S. brand led to better-than-expected earnings. Shares edged up 3.7% to $30.05 in light premarket trading.

Esterline Corp. (ESL), which provides systems, sensors and engineered materials for aerospace and defense markets, said fiscal second-quarter earnings fell 46% because of factors including acquisition costs and currency effects. Shares dropped 7.8% in light premarket trading.

China-based JA Solar said Chairman and Chief Executive Baofang Jun has offered to buy all the shares he doesn't already own in a bid that values the solar company at about $490 million. The offer is worth $9.69 an ADS, and the stock surged 15% premarket to $9.27 to approach the bid.

Yingli Green Energy Holding Co. (YGE) reported a wider loss in its first quarter, as the Chinese solar-panel company continues to reassure investors that it can repay its debt. Shares dropped 3.8% to $1.02 premarket.

Zoe's Kitchen Inc. (ZOES) swung to a first-quarter profit, helped by new restaurant openings and lower ingredient costs. The fast-casual restaurant chain raised its sales projections for the year by $3 million to between $218 million and $223 million. Shares edged up 3.2% to $34.85 premarket.

Zumiez issued disappointing financial projections for the May quarter, citing domestic weakness. Shares dropped 12% to $26.10 premarket.

 
   Other stocks to watch: 

Analogic Corp. (ALOG) reported better-than-expected earnings, as favorable timing led to a 53% jump in its security and detection segment.

Cardinal Health Inc. (CAH) said it would buy Harvard Drug Group from Court Square Capital Partners for about $1.12 billion in a move that will boost Cardinal's generic and over-the-counter medicine-distribution businesses.

Checkpoint Systems Inc. (CKP) has elected a new chairman amid activist shareholder pressure. The move also follows proxy adviser Institutional Shareholder Services Inc.'s recommendation that Checkpoint shareholders vote against the company's proposed executive compensation at the annual shareholders meeting, scheduled for June 3.

Cooper Cos. (COO) said its first-quarter profit fell 23%, as the medical-device maker said currency issues led to a slight decline in gross margins.

Costco Wholesale Corp. (COST) has received subpoenas from the Drug Enforcement Administration concerning prescriptions for controlled substances and related practices.

Gap Inc. (GPS) said sales at established stores fell 1% during May but exceeded analysts' expectations as declines at its namesake brand and Banana Republic weren't as bad as Wall Street had feared.

Sears Hometown & Outlet Stores Inc. (SHOS) said profit plunged 42% in its first quarter amid lower sales and a drop in commissions from Sears Holdings Corp. The retailer operates in two segments--Sears Hometown & Hardware and Sears Outlet.

UTi Worldwide Inc. (UTIW) reported a larger-than-expected loss in the first quarter, as the logistics and supply-chain management company, in the midst of a turnaround, recorded weaker volumes.

VeriFone Systems Inc. (PAY) swung to a profit, as the electronic-payments-equipment company benefited from strong revenue growth in North America during the quarter ended in April.

Write to Maria Armental at maria.armental@wsj.com

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