NEW YORK ( TheStreet) -- Hercules Offshore ( HERO) was the biggest gainer among small-caps Monday afternoon after it announced late Friday that it would buy assets owned by Seahawk Drilling for $105 million.

Shares were soaring 17% to $4.23 on volumes of nearly 12 million in early afternoon trading.

Shares of Emcore ( EMKR) were climbing 9% to $2.51 on unusually high volumes of over 6 million. There was no headline on Monday on the stock. The stock skyrocketed 29% last week, though amid a rally in optical networking stocks following strong results from JDS Uniphase ( JDSU).

PDL Biopharma ( PDLI) was a notable winner on Monday after legendary hedge fund manager Seth Klarman's Baupost group disclosed a new position in the company. The fund bought 5.6 million shares in the company, making it among the top ten holdings in the portfolio by market value.

Uranium Energy ( UEC) saw its stock jump 8% to $6.70. The company said Monday it filed a response to a request for additional information by the Texas Commission on Environmental Quality regarding the company's radioactive material license application for the Goliad in-situ recovery project in South Texas. The radioactive material license is the last state-level authorization needed for the company's Goliad ISR project.

Meanwhile shares of uranium miner Denison Mines ( DNN) continued to climb, rising another 6.5% to $4.41. The stock is up 20% year to date.

Shares of solar companies JA Solar ( JASO) and LDK Solar ( LDK) were rising 4.8% to $8.10 and 4.3% to $13.46 in Monday trading.

-- Written by Shanthi Bharatwaj in New York

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Disclosure: TheStreet's editorial policy prohibits staff editors and reporters from holding positions in any individual stocks.

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