Hoku Scientific ( HOKU) shot up after the Hawaii-based company extended its planned polysilicon contract with German solar power developer Solar-Fabrik. Hoku, which makes clean energy technologies, now expects to see about $175 million worth of polysilicon sales over several years under the deal, up from a prior estimate of between $120 million and $140 million. Shares were rising 45 cents, or 8.4%, to $5.78.

Shares of Movie Gallery ( MOVI) were higher after the Alabama-based company said it would refinance its existing senior secured credit facility. The transaction, which will be arranged by Goldman Sachs, is expected to close within the first quarter. The video-store chain's stock was rising 34 cents, or 9.1%, to $4.11.

Oncolytics Biotech ( ONCY) sank after the Canada-based company said it will sell about $10.2 million worth of stock and purchase warrants (converted from Canadian dollars), with an underwriter's option worth about $1.5 million. The offer will likely close Feb. 22. Shares were trading down 40 cents, or 14.7%, to $2.33.

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