Among the companies with shares expected to actively trade in Wednesday's session are Ambarella Inc. (AMBA), Mattress Firm Holding Corp. (MFRM), and Mitcham Industries Inc. (MIND).

Ambarella's fiscal first-quarter profit rose 82% as the manufacturer of image-processing chips posted strong growth in its Internet-protocol security camera and wearable sports camera markets. Shares rose 11% to $17.95 in after-hours trading, as results topped Wall Street expectations.

Mattress Firm's fiscal first-quarter earnings rose 23% as the bedding retailer's revenue improved, despite a same-store sales decline. Shares climbed 3.8% to $39.98 after hours as results topped analyst expectations.

Mitcham Industries' fiscal first-quarter earnings fell 25% as the seismic-equipment supplier posted weaker revenue, although margins improved. Results missed analysts' expectations. Shares were down 6.2% to $15.99 after hours.

Analogic Corp.'s (ALOG) fiscal third-quarter earnings fell 29% as the electronics-component maker's increase in operating expenses masked slight revenue growth. Given current market conditions and the ultrasound segment's transition to high-market direct products, Analogic lowered its full-year revenue view. Shares slipped 4.7% to $76.50 after hours.

Bazaarvoice Inc.'s (BV) fiscal fourth-quarter loss widened as the software company logged higher sales and marketing costs and acquisition-related expenses, masking double-digit revenue growth. However, shares climbed 4% to $8.25 after hours as results beat Wall Street expectations.

SHFL Entertainment Inc.'s (SHFL) fiscal second-quarter profit rose 22% as the casino-games company posted record revenue in its slot machine, shuffler, and specialty table games businesses. Shares rose 5.1% to $18.25 after hours as results topped analysts' expectations.

A downsized offering of 6.5 million Ubiquiti Networks Inc. (UBNT) shares being sold by certain stockholders priced at a 4.4% discount to the Internet-gear manufacturer's Tuesday closing price. Shares slipped 2.4% to $16.33 after hours, above the offering's price of $16.

Watchlist:

Aveo Pharmaceuticals Inc. (AVEO) plans to reduce its workforce by 62% as the developer of cancer therapies restructures to refocus on the clinical development of tivozanib in colorectal and breast cancer, as well as advancing key pipeline and preclinical assets.

Bob Evans Farms Inc.'s (BOBE) fiscal fourth-quarter earnings rose 23% thanks to a tax benefit masking losses related to the sale of its Mimi's Cafe business and weaker revenue. Adjusted earnings and revenue beat expectations.

Dish Network Corp. (DISH) disputed legal and governance objections raised by Sprint Nextel Corp. (S) to Dish's tender offer for Clearwire Corp. (CLWR), elevating the war of words between the companies seeking control of the mobile broadband provider.

EXFO Inc. (EXFO) said its fiscal third-quarter results will miss its prior expectations, as weak economic conditions hurt the maker of telecommunications-testing equipment's bookings in Europe, the Middle East and Asia.

Forest City Enterprises Inc. (FCEA) swung to a fiscal first-quarter loss, mostly owing to lower commercial land sales, decreased capitalized interest related to the reduction of its under-construction pipeline and other impacts.

Tile Shop Holdings Inc. (TTS) said an offering of about 4.3 million shares by certain stockholders priced at a 1.6% discount to the company's closing price.

Write to Nathalie Tadena at nathalie.tadena@dowjones.com

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