Among the companies with shares expected to actively trade in Friday's session are Aruba Networks Inc. (ARUN), J.C. Penney Co. (JCP) and Sina Corp. (SINA).

Aruba Networks swung to a fiscal third-quarter loss as the wireless-equipment maker's results were hampered by higher taxes and expenses, which masked improved revenue. Shares sank 20% to $14.10 in premarket trading after the company issued downbeat second-quarter guidance. Meanwhile, competitor Ruckus Wireless Inc. (RKUS) rose 4.21% in premarket trading.

Gold prices declined amid an industry report and disclosures of scaled-back bets by some hedge funds, which indicate investors' interest in the precious metal is ebbing. American depositary shares of some gold miners declined, including AngloGold Ashanti Ltd. (AU), which is down 2.1% to $17.18 in premarket trading, and Gold Fields Ltd. (GFI), which dropped 2.3% to $5.99.

Brocade Communications Systems Inc.'s (BRCD) fiscal second-quarter earnings rose 19% as the manufacturer of data and storage-networking products saw expenses fall, though revenue was roughly flat from a year earlier. The company provided guidance for the current quarter below Wall Street estimates. Shares fell 5.9% to $5.40 in recent premarket trading.

Royal Bank of Scotland Group PLC (RBS, RBS.LN), which is 81% state-owned, unveiled plans to cut about 1,400 jobs in its retail head office, part of a restructuring of the unit to improve returns. American depositary shares rose 2.9% to $9.99 in recent premarket trading.

Triple-S Management Corp. (GTS) said a secondary offering of 5.4 million of its Class B shares priced at a 4.5% discount to Thursday's close. Shares fell 1.6% to $18.80 in recent premarket trading, but stayed above the per-share offer price of $18.25.

J.C. Penney lost $348 million in the first quarter on top of nearly $1 billion in losses last year, as sales continued to slide at the beleaguered retailer. Shares fell 1% to $18.60 in recent premarket trading.

Nordstrom Inc.'s (JWN) fiscal first-quarter earnings fell 2.7% as the high-end department store operator was hurt by weaker-than-expected sales volume and higher costs and expenses. Shares slipped 3.9% to $58.76 in premarket trading after the company also cut its 2014 revenue and same-store sales outlooks.

Sina's first-quarter loss narrowed as margins widened at the Chinese Internet company, which also reported a surprise core profit. Shares rose 3.7% to $61 in recent premarket trading after the company offered a second-quarter revenue view that topped consensus estimates.

Stemline Therapeutics Inc. (STML) said its offering of 4.1 million shares priced at a 3.3% discount to Thursday's close. Shares rose 3% to $15.45 in recent premarket trading, above the per-share offer price of $14.50.

3D Systems Corp. continued to fall after William Blair downgraded it and fellow industrial 3-D printer maker Stratasys Ltd. (SSYS) to underperform while saying it is "waiting for expectations to align with reality." Their P-Es, at nearly 50, are well above long-term averages, and while both companies' result financial results have "been impressive...media hype has led investors to overlook some key fundamentals of these companies and ultimately has given rise to unreasonable growth expectations." Shares of 3D fell 2.6% to $44.42 in recent premarket trading.

 
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Anaren Inc. (ANEN) called Vintage Capital Management LLC's offer to buy the manufacturer "inadequate" and said it will continue to review its strategic options.

Applied Materials Inc. (AMAT) posted its third straight quarterly loss as its solar supply business continued to struggle, prompting a write-down that masked stronger profitability in other areas.

Dell Inc.'s (DELL) investor base is shifting ahead of a shareholder vote on the company's proposed $24.4 billion buyout, as the computer maker on Thursday posted an posted an expected drop in quarterly profit. Dell posted a nearly 80% decline in net income for its fiscal first quarter ended May 3. Revenue was up 2% to $14.1 billion. The numbers were expected after The Wall Street Journal and other media reported earlier this week that Dell planned to post worse-than-expected quarterly results.

Donaldson Co.'s (DCI) fiscal third-quarter profit fell 1.6% as the maker of filtration systems posted significantly weaker-than-expected revenue due to softer engine-product and industrial-product sales. The company again lowered its full-year guidance.

Real-estate services firm Jones Lang LaSalle Inc. (JLL) has named Christie B. Kelly as its new finance chief, replacing Lauralee Martin.

Standard & Poor's said Kansas City Southern (KSU) will replace Dean Foods Co. (DF) in the S&P 500, following the dairy company's spinoff of its organic and soy business as WhiteWave Foods Co. (WWAV).

Northrop Grumman Corp. (NOC) has approved an additional $4 billion in share repurchases as the defense firm continues its efforts to boost shareholder returns.

SciClone Pharmaceuticals Inc. (SCLN) said it entered into a drug agreement with Zensun (Shanghai) Science & Technology Co., expanding its reach in China.

Sempra Energy (SRE) reached a joint venture agreement with GDF Suez SA (GSZ.FR), Mitsubishi Corp. (MSBHY, 8058.TO) and Mitsui & Co. (MITSY, 8306.TO) to develop a liquefied natural-gas export facility at the site of the Cameron LNG facility in Louisiana.

Stage Stores Inc. (SSI) sharply widened its fiscal first-quarter loss as the retailer saw its margins narrow and reported revenue below Street views, amid what Chief Executive Officer Michael Glazer called "unseasonably cool weather in March and April." Wall Street had expected a per-share profit.

Write Saabira Chaudhuri at saabira.chaudhuri@dowjones.com

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