U.S. stocks closed higher Wednesday as the Dow Jones Industrial Average rose 24.53 points to 16097.33, the S&P 500 rose 4.48 points to 1807.23, and the Nasdaq Composite grew 27 points to 4044.75. Among the stocks actively trading after hours are Document Security Systems Inc. (DSS), Fortinet Inc. (FTNT) and Zoom Technologies Inc. (ZOOM).

A subsidiary of Document Security Systems ($2.13, +13.3%), which develops and integrates security technology, filed a patent lawsuit against Apple Inc. (AAPL). The case centers on patents related to the use of wireless peripheral devices.

China's Zoom Technologies ($6.49, +170.42%) said it agreed to acquire mobile-advertising service Baifen Tonglian Information and Technology Co.

Network security company Fortinet ($18.90, -3.77%) said its chief operating officer and chief financial officer, Ahmed Rubaie, will leave the company next month due to personal reasons. Nancy Bush was appointed to take over the CFO role on an interim basis.

 
   Regular Session Movers: 
 

AeroVironment Inc.'s (AVAV, $29.76, +$2.84, +10.55%) fiscal second-quarter profit fell 81% on a sharp decline in revenue and margins. However, shares were up as the maker of pilotless drones and rechargeable-batteries reported adjusted earnings and revenue that topped expectations.

Bio-Reference Laboratories Inc. (BRLI, $29.55, -$8.18, -21.68%) projected fiscal-fourth quarter earnings below expectations and also gave a cautious view for the recently started fiscal year. The clinical-testing company said it has been under pressure from reimbursement rates, higher costs stemming from upgrading acquisitions in Florida and California, as well as substantial start-up costs for its inherited cancer program.

Frontline Ltd.'s (FRO, $2.73, +$0.38, +16.17%) third-quarter loss narrowed as the tanker company benefited from stronger revenue and a decline in some of its expenses. The company's shares rose as the loss wasn't as wide as feared and revenue excluding voyage expenses and commission topped expectations.

Hewlett-Packard Co. (HPQ, $27.36, +$2.27, +9.05%) posted weaker fiscal fourth-quarter sales, the ninth-consecutive revenue decline, as the computer maker reported lighter software and printing revenue. But H-P swung to a profit in the latest quarter and results for the quarter topped analyst expectations.

Infoblox Inc. (BLOX, $32.08, -$12.88, -28.65%) fiscal first-quarter loss widened slightly despite strong revenue growth as margins weakened and costs rose. The network-automation company shares slid as it projected fiscal second-quarter earnings and revenue below analysts' expectations.

Lime Energy Co. (LIME, $3.32, -$0.20, -5.68%) fired Chief Executive John O'Rourke while simultaneously promoting President and Chief Operating Officer Adam Procell to the top post.

Shanda Games Ltd.'s (GAME, $4.05, -$0.06, -1.46%) third-quarter earnings fell 1.6% despite growth in the game developer's revenue driven by its mobile-game segment. Morgan Stanley analysts weren't impressed with the company's PC game pipeline, while sales of its top PC games dropped in the latest period.

Teen retailer Tilly's Inc. (TLYS, $12, -$3.88, -24.43%) issued a dismal profit outlook for the fiscal fourth quarter, as weak traffic trends and high promotions are expected to hurt the bottom line. Shares slumped as Tilly's tempered its fiscal full-year outlook and reported weaker-than-expected revenue for the third quarter.

 
 
 

Write to Michael Calia at michael.calia@wsj.com

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