Thursday’s biggest gaining and declining stocks

CHICAGO (MarketWatch) � Shares of the following companies were among those that made notable moves in the U.S. stock market Thursday.

Gainers

Badger Meter Inc.�s BMI �shares rose 11% after Janney Montgomery Scott LLC raised its rating of the manufacturer to buy from neutral.

Boston Scientific BSX �shares jumped 7% after the medical device maker reported significantly improved earnings. Read more on Boston Scientific's earnings.

CVR Energy Inc.�s CVI �shares jumped 8.2% after billionaire investor Carl Icahn forged a deal with the petroleum refiner that will let him proceed with his unsolicited $30 per share bid for the company.

Cypress Semiconductor Corp.�s CY �shares jumped 12% after the chip manufacturer�s adjusted results topped market expectations.

EBay Inc. EBAY �shares popped 13% a day after the online auctioneer reported better-than-expected quarterly results. Read more about eBay's earnings.

F5 Networks Inc.�s FFIV �shares gained 7.9% after Deutsche Bank raised its price target on shares of the cloud-computing company to $150 from $135. Read more on F5's earnings.

Gilead Sciences Inc.�s GILD �shares rallied 12% after the drug developer released promising clinical data for its hepatitis C drug candidate GS-7977. Read more on Gilead's hepatitis C drug.

Human Genome Sciences Inc.�s HGSI �shares surged after the biotechnology company said it hired financial advisors to evaluate its options, including a possible sale. Read about Glaxo's bid.

Mellanox Technologies Ltd.�s MLNX �shares shot up 52% after the tech company reported better-than-expected first-quarter earnings late Wednesday.New York Times Co.�s NYT �gained 4.4% after the newspaper publisher reported better-than-expected first-quarter earnings.

Peabody Energy Corp. BTU �shares climbed 7% after the coal miner reported quarterly results that topped Wall Street�s expectations.

Supertex Inc.�s SUPX �shares rose 9.4% after the chip maker said fiscal fourth-quarter sales would be in a range that exceeds most Wall Street estimates.

Tumi Holdings Inc.�s TUMI �shares rallied in the luggage maker�s first day as a publicly trading company. Read more on Tumi's IPO.Ultratech Inc.�s UTEK �shares climbed 10% after the maker of laser-processing components reported better-than-expected first quarter revenue.

Click to Play First fracking rules unveiled

Federal regulators enact the first significant curbs on the fast-spreading drilling technique called fracking since widespread concerns about its environmental impact surfaced. Photo: Getty Images

Decliners

Achillion Pharmaceuticals Inc.�s ACHN �shares tumbled 13% after a rival�s positive news.SWK � Read more on hepatits C drugs.

Basic Energy Services Inc.�s BAS �stock fell 11% after the company reported first-quarter earnings that fell short of analyst forecasts.

First Horizon National Corp. FHN �retreated 7.8% after the bank reported a 24% drop in first-quarter profit.

Firsthand Technology Value Fund Inc.�s SVVC �shares fell 13% to $26.24 each after it priced a follow-un offering of 4.4 million shares priced at $27.

Gentex Corp.�s GNTX �shares lost 16% after the maker of driver-assistance systems reported first-quarter revenue that fell short of most Wall Street estimates.

LifeTime Fitness Inc. LTM �shares were down 8.4% after the health club operator issued a disappointing 2012 forecast.

Stanley Black & Decker Inc.�s SWK �shares fell 7.1% a day after the tool maker reported its first-quarter profit dropped by 23%. Read more on Stanley Black & Decker earnings.

Qualcomm Inc. QCOM �shares slid 6.6%. The chip maker released its quarterly earnings report late Wednesday. Read more on Qualcomm's earnings report.