Among the companies with shares expected to actively trade in Tuesday's session are Dollar General Corp. (DG), Starbucks Corp. (SBUX) and Westport Innovations Inc. (WPT.T, WPRT). Dollar General late Monday reported a 36% jump in fiscal first-quarter earnings, yet concerned investors as it also unveiled plans for a secondary offering and did not raise its 3%-5% full-year comparable-store sales guidance following a 6.7% increase the first quarter. Shares were last off 4.9% to $46.11 in premarket trading. Starbucks said it will acquire Bay Bread LLC and its La Boulange Bakery brand from investment group Next World Group for $100 million in cash, a move aimed at expanding its food offerings. Analysts at Wells Fargo questioned the deal, wondering aloud if Starbucks is "potentially overextending its capabilities by acquiring La Boulange rather than forging a partnership with Bay Breads or another upscale bakery brand and/or developing a proprietary brand." Shares were down 2.4% at $52.60 in premarket trade. Shares of Westport Innovations Inc. (WPT.T, WPRT) got a boost after mining equipment giant Caterpillar Inc. (CAT) said it has agreed to begin working with Westport to develop a natural gas fuel system for its off-road equipment. Westport shares were last changing hands 8.4% higher at $24.14 in premarket trade. JA Solar Holdings Co. (JASO) swung to a loss in the first quarter as the solar products company struggled under a double-digit drop in shipments and sharply weakened margins. Shares were last up 5.6% to 94 cents in premarket trade. DNA sequencing company Complete Genomics Inc. (GNOM) said it plans to cut 55 jobs and has hired an adviser to explore options for its business, including a possible sale. Launched as a venture company to make DNA sequencing faster and cheaper, Complete Genomics has struggled with recurring losses since becoming a public company in November 2010. Shares jumped 9.8% to $2.22 in premarket trade. Galena Biopharma Inc. (GALE) said its treatment to reduce the recurrence of breast cancer improved survival rates in preliminary results from a long-term study. Shares were up 4.4% to $1.41 premarket. Israel-based biopharmaceutical drug developer BioLineRx Ltd. (BLRX) said it has moved a step closer to receiving patents on its treatment for neuropathic pain. Shares jumped 12% to $2.60 premarket. Opnext Inc.'s (OPXT) board has determined that a technology-focused private-equity firm's unsolicited offer to acquire the optical-components maker for $1.40 a share was not superior to Opnext's proposed merger with peer Oclaro Inc. (OCLR). Opnext shares were 13% to $1.10 premarket while Oclaro shares were unchanged at Monday's $2.31 close. Watchlist: Amazon.com Inc. (AMZN) acquired publication rights from Avalon Books for more than 3,000 of its books, mostly in the romance, mystery and western genres. Central European Distribution Corp. (CEDC) said it plans to restate its financial results for all periods from the past two years due to accounting errors related to retroactive trade rebates at the company's main subsidiary in Russia. Google Inc. (GOOG) agreed to buy privately held ad platform provider Meebo Inc. for an undisclosed sum, adding more developers to the Internet search giant's social-media team. FedEx Corp. (FDX) said it will permanently retire some of its widebody jets and take an $84 million charge against net profits in its latest quarter as its reconfigures its fleet in the face of sluggish domestic demand and still-high fuel prices. Layne Christensen Co.'s (LAYN) fiscal first-quarter profit sank 71% as the drilling-services provider saw continued difficulties in its water infrastructure business. Walgreen Co.'s (WAG) same-store sales fell a slightly bigger-than-expected 5.8% during May--marking a fifth straight month of declines--as the drug-store chain's loss of Express Scripts Holding Co.'s (ESRX) members continued to take a toll. Write to Mia Lamar at mia.lamar@dowjones.com
