Among the companies with shares expected to actively trade in Tuesday's session are RadioShack Corp. (RSH) and Vipshop Holdings Ltd. (VIPS).

RadioShack Corp. (RSH) said Tuesday that it expects to close up to 1,100 U.S. stores, or about 20% of its footprint, while also reporting its fourth-quarter loss widened significantly. Shares dropped premarket as the struggling electronics retailer's results were considerably worse than market expectations. Shares fell 24% to $2.08 premarket.

Vipshop Holdings Ltd.'s (VIPS) fourth-quarter earnings more than tripled as the Chinese online discount retailer's margins and revenue continued to improve. The company's adjusted fourth-quarter earnings and its first-quarter revenue guidance topped Wall Street's expectations. Shares rose 22% to $156 premarket.

AutoZone Inc. (AZO) said its fiscal second-quarter earnings rose 9.4% on revenue growth and stronger margins despite severe winter weather in the U.S. Results beat expectations, pushing shares up 1.8% to $551 premarket.

Guidewire Software Inc. (GWRE) swung to a loss in its fiscal second quarter as the provider of software to the insurance industry reported higher costs and expenses, which masked an increase in revenue. Shares rose 5.3% to $55.99 premarket.

MBIA Inc. (MBI) said its fourth-quarter earnings fell 79% on lower mark-to-market derivatives-related gains and a decline in premiums. Shares rose 4% to $13.85 premarket.

McDermott International Inc. (MDR) said it is withdrawing its financial guidance while the engineering and construction company implements some organizational changes and closes out legacy projects. The company also reported swinging to a steep loss for the fourth quarter. Shares fell 9.4% to $7.35 premarket.

Qualcomm Inc.'s (QCOM) board approved a $5 billion increase to its share repurchase plan and a 20% dividend boost, as the San Diego-based chip maker sought to reward shareholders. The share buyback plan now has a total authorization of $7.8 billion. The company's market value is about $124.5 billion, according to FactSet. Shares rose 2.3% to $75.30 premarket.

Starwood Hotels & Resorts Worldwide Inc. (HOT) said Tuesday that it plans to open more than 60 hotels and resorts in Europe by 2020, boosting its portfolio on the continent by about 40%. The company, which opened seven hotels in Europe last year, said it would open nine hotels there this year, mainly in high-growth markets such as Turkey and Russia. Shares fell 26 cents to $80.46 premarket.

Biopharmaceutical firm Synta Pharmaceuticals Corp. (SNTA) said its chief executive, president and board member Safi R. Bahcall has resigned from his positions and has been replaced by an executive committee of the board until a new CEO is named. Shares rose 2.9% to $15.16 premarket.

Trina Solar Ltd. (TSL) said it swung to a profit in its fourth quarter, bolstered by a surge in revenue and a drop in operating expenses. Revenue, meanwhile, rose 74% to $525.6 million compared to the year-ago period, driven by growing demand, particularly from Japan and China. Shares rose 2.9% to $15.18 premarket.

Stock Offerings:

Clinical-stage biopharmaceutical company BioLineRx Ltd. (BLRX) has commenced an underwritten public offering of its American depositary shares. ADSs fell 18% to $2.39 premarket.

Mandalay Digital Group Inc. (MNDL) said it plans to commence a public offering of its common stock and to use the net proceeds for general corporate purposes, including working capital, operations and potential acquisitions. Shares fell 9.1% to $4.18 premarket.

 
   Watch List: 

Ascena Retail Group Inc. (ASNA) said its fiscal second-quarter earnings fell 15% mostly on a steep drop in profit at its Justice brand and increased operating expenses related to growth efforts. For the year, the company again lowered its per-share earnings estimate.

E.W. Scripps Co. (SSP) said its fourth-quarter earnings plummeted 71% as the newspaper and television company continued to suffer from a lack of political television advertisements in an off-election year. Yet the company expects its core business to return to growth in the second half of the year with renewed strength in political advertising, said Chief Executive Rich Boehne Tuesday. The top line slightly beat expectations.

URS Corp.'s (URS) fourth-quarter profit dropped 73% as the construction and engineering company's revenue slipped. In February, the company had lowered its outlook for 2013 earnings, citing execution issues in its new oil-and-gas division, as well as project delays.

Write to Anna Prior at anna.prior@wsj.com

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