Staar Surgical ( STAA) jumped 5% in after-hours trading as the ophthalmic-products maker announced preliminary fourth-quarter results that should top Wall Street estimates. The Monrovia, Calif., company said revenue will likely grow 26% to about $15.2 million year over year. Analysts polled by Thomson Financial are looking for $14.3 million for the quarter. Shares were adding 34 cents to $7.05.

Volcano ( VOLC), which makes equipment for the treatment of vascular and structural heart disease, also gained on word of a better-than-expected revenue outlook. The company predicts a 20% jump in fourth-quarter sales to about $29 million, as well as a 12% full-year climb to $103 million. Wall Street is seeking $26.6 million and $100.1 million, respectively. The Rancho Cordova, Calif., company was rising 58 cents, or 3.2%, to $18.60.

Sapient ( SAPE) rose on third-quarter results -- called preliminary due to a stock-option grant review -- that topped estimates. The business-software company posted non-GAAP income from operations of $7.1 million, down from last year's $7.4 million, with per-share earnings adding a penny to 7 cents. Analysts had sought 4 cents a share.

The Massachusetts-based firm said that revenue swelled to $111.5 million from $84.3 million a year ago, beating the consensus by about $9.3 million. The company also forecast that fourth-quarter operating margins will rise sequentially. Shares were bouncing 19 cents, or 3.2%, to $6.15.

Onyx Pharmaceuticals ( ONXX) climbed on word that advanced-phase trial results for a kidney cancer treatment it's developing with Bayer ( BAY) will be cited in New England Journal of Medicine Thursday as "a major step forward" in the fight against the disease. The study showed that the drug, called Nexavar, doubled patients' median progression-free survival. Shares were climbing 34 cents, or 2.8%, to $12.30.

Transmeridian Exploration ( TMY) was higher after the Houston-based oil driller said it had inked a 25-year production contract with the Kazakhstani government. This will allow exploration on at least 3,500 acres in South Alibek that contain 72.9 million barrels of proved reserves, and about half of probable reserves totaling 108.2 million barrels. Shares were up 6 cents, or 2.2%, to $2.74.

Ashworth ( ASHW) fell as the sportswear maker slid further into the red for the fiscal fourth quarter ended Oct. 31, losing $4.4 million, or 30 cents a share. Revenue declined to $50.2 million from $55.3 million in the prior year. A year ago it lost only $2.2 million, or 16 cents a share, though both of this year's figures beat one analyst's forecast of 25 cents a share on $45.3 million in revenue.

The company also swung to a $951,000 profit in fiscal 2006, or 7 cents a share, which also misses the analyst's 12-cents prediction. The company had lost $727,000, or a nickel a share, in fiscal 2005. Shares were slipping 20 cents, or 2.9%, to $6.89.