NEW YORK ( TheStreet) -- Several small-cap stocks were poised to move on above-average volume during Monday's session

Hansen Medical ( HNSN) dropped by 52 cents, or 15.2%, to $2.91 in the premarket session after the company said it will restate prior financial results to correct errors regarding the timing of revenue recognition on the sale of some of its Sensei Robotic Catheter Systems. The three-month average daily volume for Hansen is 484,000, according to Yahoo! Finance.

Allion Healthcare ( ALLI) surged by $1.03, or 18.9%, to $6.47 in the premarket session after the company said it agreed to be acquired by global private investment firm H.I.G. Capital for $6.60 a share. The deal is valued at approximately $278 million, including the assumption or repayment of approximately $79 million of indebtedness. The three-month average daily volume for Allion is 88,000, according to Yahoo! Finance.

QLT ( QLTI) jumped by 22 cents, or 5.5%, to $4.20 in the premarket session after the company said it restructured an agreement with Novartis ( NVS) to receive exclusive U.S. rights to sell and market the anti-blindness treatment Visudyne in the U.S. Novartis will have marketing and sales rights in all countries outside of the U.S. and will pay QLT a royalty of 20% of ex-U.S. net sales until Dec. 31, 2014, and thereafter 16% of ex-U.S. net sales until Dec. 31, 2019. The three-month average daily volume for QLT is 512,000, according to Yahoo! Finance.

Trimeris ( TRMS) was poised to trade higher Monday after the company said it will be acquired by Korea's Arigene for $3.60 a share, compared to Friday's closing price of $3.46 a share. The three-month average daily volume for Trimeris is 150,000, according to Yahoo! Finance.

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