Among the companies with shares expected to actively trade in Monday's session are Theravance Inc. (THRX), Endo Health Solutions Inc. (ENDP) and Perion Network Ltd. (PERI).

Elan Corp. (ELN) Monday said it had reached a $1 billion deal with Theravance for a share in the royalty stream of four respiratory drug programs, as the Irish company fends off approaches from pharmaceutical investor Royalty Pharma. Theravance shares rose 13% to $39.50 premarket.

Endo Health Solutions said Friday the U.S. Food and Drug Administration has denied its petition that would have halted generic competition to its Opana painkiller on safety grounds. The move will impact the company's earnings and lead it to explore options to mitigate the damage. Shares were off 4.9% to $33.25 in premarket trading.

Digital media company Perion Network reported first-quarter results that beat analysts' estimates amid record organic and total revenue growth and what Chief Executive Josef Mandelbaum described as "enthusiastic acceptance of our new Incredimail for iPad product." The company also said that it will achieve, and likely exceed, its 2013 financial outlook. Shares rose 14% to $14.30 premarket.

Bears' skepticism of Uni-Pixel Inc. (UNXL) seems well-placed as the company is entering a crowded field and aiming to compete against far more experienced producers, said a recent story in Barron's. Shares fell 5% to $33.00 premarket.

 
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Alliant Techsystems Inc. (ATK) has agreed to buy hunting rifles and shotgun company Caliber Co. for $315 million in cash, a move that would add long guns to its brands in commercial and security ammunition, shooting sports and security-related accessories.

Standard & Poor's Ratings Services lowered its outlook on Alpha Natural Resources Inc. (ANR) to negative from stable, saying continued weakness in coal markets will likely challenge the company's operating conditions.

Digital-content distributor Cinedigm Digital Cinema Corp. (CIDM) cut its view for fiscal 2013, citing delayed delivery and customer product acceptance.

S&P raised the credit rating on Delta Air Lines Inc. (DAL) by one step, citing the carrier's gradually improving financial profile.

S&P boosted its rating on Gap Inc. (GPS) by a notch into investment-grade territory, saying it expects the retailer to be able to sustain recent trends in same-store sales growth and margin expansion.

The U.S. distributor of injectable drugs made by Hospira Inc. (HSP) is recalling certain lots because of a risk of vein inflammation, kidney impairment and other serious harm to patients. Hospira has been troubled by a series of quality-control problems related to its manufacturing of injectable drugs and infusion technologies.

Nielsen Holdings NV (NLSN) said some selling shareholders are offering 35 million shares of the market-research company's stock. The company, which had 375 million shares outstanding as of March 31, won't receive any proceeds from the offer.

Restoration Hardware Holdings Inc. (RH) has unveiled an offering of 7.5 million of its shares, as shareholders are continuing to trim their stake in the retailer. The company won't receive any proceeds from the sale of shares, which are being offered by existing shareholders. As of April 16, Restoration had about 38.1 million shares outstanding.

Tessera Technologies Inc. (TSRA) unveiled a special cash dividend and expects at least $16 million of stock repurchases through its buyback program over the next year. The dividend of 30 cents a share, payable at the end of May, was determined based on the episodic revenue the company generated over the preceding four quarters, net of certain costs. It will cost Tessera $16 million.

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

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