NEW YORK ( TheStreet) -- Medical devices maker Synergetics ( SURG) reported fourth-quarter profit of 8 cents a share, meeting expectations.

Shares were plunging 12.3% to $5.50 in premarket trading, ahead of the company's conference call at 10:30 a.m. EDT.

Los Angeles clothing company Joe's Jeans ( JOEZ) posted a 5% year-over-year decline in sales in its fiscal third quarter. The company said it swung to a third-quarter loss of $2 million, or 3 cents a share, from a profit of $558,000, or a penny per share, in the same period a year earlier.

Shares were falling 10.1% to 62 cents.

Aluminum producer Alcoa ( AA) fell short of Wall Street's profit view, despite better-than-expected revenue, sending shares lower in premarket trading.

The company reported earnings from continuing operations of $172 million, or 15 cents a share, for its third quarter on revenue of $6.42 billion. The average estimate of analysts polled by Thomson Reuters was for a profit of 22 cents a share on revenue of $6.24 billion in the period.

Klaus Kleinfeld, the company's chairman and CEO, backed Alcoa's outlook for growth of 12% in aluminum demand for 2011, saying the company sees a "slower pace in the second half of the year, and reaffirm(s) our long-term forecast for a doubling of aluminum demand by 2020."

Shares were tumbling 3.8% to $9.91.

Food and beverage giant PepsiCo ( PEP) reported third-quarter core profit of $1.31 a share, beating the average analyst estimate of $1.30 a share.

For 2011, the company is targeting high-single-digit earnings per share growth and anticipates share repurchases of about $2.5 billion in 2011.

Shares were rising 1.6% to $61.92.

Telecommunications firm NeuStar ( NSR) said it will buy caller ID company TARGUSinfo for about $650 million in cash. NeuStar also lifted its full-year earnings guidance to $1.76 and $1.84 a share on revenue of $595 million to $600 million from its previous outlook of earnings of $1.68 to $1.76 a share on revenue of $585 million to $600 million.

Shares were rising 1.6% to $28.50.

Hewlett-Packard ( HPQ) is reconsidering the spinoff of its personal-computer division, the Wall Street Journal reported.

Shares were up 0.9% to $26.15.

BlackBerry users around the world have been cut off from texting for a third straight day.

Research In Motion ( RIMM) said Tuesday that its services returned to normal after a failure within its own infrastructure was discovered. But later it acknowledged that disruptions were continuing.

The stock was down 0.6% to $24.26.

Chevron ( CVX) said in its interim update that earnings for the third quarter are expected to be in line with that of the second quarter, as a one-time refinery sale helps buttress results during a period of declining crude oil prices. Shares were up 0.3% to $97.90.

Healthcare Services ( HCSG), the provider of housekeeping and laundry services to the healthcare industry, increased its dividend to 16 cents a share, the 33rd consecutive increase since the company initiated regular dividend payouts in 2003.

Private-equity firm Bain Capital is in final talks to buy Japanese restaurant-chain operator Skylark from Nomura ( NMR) for up to $3.4 billion, including debt, the Wall Street Journal reported.

-- Written by Andrea Tse in New York.

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