US STOCK FUTURES: HOT STOCKS TO WATCH

Among the companies with shares expected to actively trade in Monday's session are Armstrong World Industries Inc. (AWI), Weatherford International Ltd. (WFT) and Vivus Inc. (VVUS).

Armstrong declared a special dividend of $8.55 a share as the company joined a handful of others making large payouts in an effort to reassure investors of their future prospects. The move comes after the building-products maker floated a plan to provide the special dividend earlier this month. Shares were up 3.2.% at $58.61 premarket.

Weatherford International on Friday named John H. Briscoe, a relatively new hire, as its chief financial officer. Briscoe replaces Andrew P. Becnel, who will leave the company after accounting errors forced the oilfield services company to restate some past results. Shares up 2.6% at $17.06 premarket.

Arena Pharmaceuticals Inc. (ARNA) said its weight-loss drug candidate lorcaserin was accepted for review by European regulators and confirmed that a U.S. Food and Drug Administration advisory committee will meet in the second quarter to discuss the company's resubmitted application for lorcaserin. Shares were up 8.7% at $2.62 premarket.

Vivus Inc.'s (VVUS) application for approval of its investigational drug to treat erectile dysfunction was accepted by European regulators for review. Shares rose 2.6% at $21.87 premarket.

Cal-Maine Foods Inc.'s (CALM) fiscal third-quarter earnings fell 22% from a year-earlier period that included an investment gain. The largest producer and distributor of fresh shell eggs reported that margins were hurt by rising feed costs. Shares were up 4 cents at $41.99 premarket.

Hewlett-Packard Co. (HPQ) increased its quarterly dividend by 10%, adding a technology heavyweight to the list of corporations that have raised payouts to shareholders in recent months. Shares were up 21 cents at $23.84 premarket.

The Securities and Exchange Commission accused Wells Fargo & Co. (WFC) of failing to provide documents requested for a probe into the bank's residential mortgage-backed securities business, according to a court filing the agency made Friday. Wells Fargo called the SEC's move "inappropriate and unwarranted" and vowed to defend itself in court. Shares were up 1.3% at $33.96 premarket.

 
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NetJets Inc., a unit of Warren Buffett's Berkshire Hathaway Inc. (BRKA, BRKB), it will partner with a consortium of Chinese investors led by a unit of Beijing-based private-equity fund Hony Capital and Fung Investments as it presses ahead with plans to launch a corporate jet business in China, where it sees strong growth potential. As the world's largest provider of business jets, NetJets sells part-shares in planes and also rents them on a per-use basis.

ChinaCast Education Corp.'s (CAST) board removed Ron Chan Tze Ngon as the post-secondary education and e-learning services provider's chairman and chief executive, naming one its new directors as his successor.

ReneSola Ltd. (SOL) named Xiaoliang Liang as its new president of the China division to lead the solar-products maker's sales and systems development across the region.

-Edited by Tess Stynes, Mia Lamar, Ben Fox Rubin and Drew FitzGerald; write to [e-mail]