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SanDisk Corp. (Nasdaq: SNDK) reported a lower quarterly profit late Thursday, but a higher gross margin projection sent the stock up nearly 4 percent in Friday trading.

Shares of Internet portal Yahoo, Inc. fell more than 4 percent on Wednesday after the internet search giant posted a lower quarterly profit and gave a weaker-than expected forecast for the full fiscal year.

Shares of Gemstar-TV Guide International Inc. (Nasdaq: GMST) jumped on Tuesday after the company said it was exploring strategic partnerships, including possibly selling itself.

Shares of Schnitzer Steel Industries, Inc. (NASDAQ: SCHN) surged on Monday after the company reported a higher-than-expected quarterly profit.

America First Apartment Investors Inc. (NASDAQ: APRO) said on Monday that it agreed to be acquired by a privately held buyout firm for about $532 million in cash, including debt.

Shares of Cognos, Inc. (TSX: CSN) fell more than 2 percent on Friday, a day after Canada’s largest software developer forecast a second fiscal quarter profit short of analysts’ estimates.

Shares of graphics chip maker Nvidia Corp. (NASDAQ: NVDA) traded at an all time high on Thursday after the company gave an upbeat outlook for the near-term and it introduced a new high-end desktop product.

Shares of online computer retailer CDW Corp. (NASDAQ: CDWC) rose on Wednesday, a day after it agreed to be acquired by private equity group Madison Dearborn Partners LLC for $7.3 billion in cash.

La Jolla Pharmaceutical Co. (NASDAQ: LJPC)shares jumped on Thursday after the company said its lupus drug was well tolerated in data across three different reports.

Shares of Cytyc Corp.(NASDAQ: CYTC) rose more than 20 percent on Monday, a day after an announcement that Hologic, Inc. (NASDAQ: HOLX) agreed to buy the company for $6.2 billion.

Shares of MAF Bancorp Inc. (Nasdaq: MAFB) skyrocketed on Tuesday after agreeing to be acquired by National City Corp. (NSYSE: NCC) for $1.9 billion.

Strong first quarter earnings and a projections above estimates boosted shares of wireless chip maker Atheros Communications Inc. (NASDAQ: ATHR) in trading on Tuesday.

The world's largest online retailer, Amazon Inc. (Nasdaq: AMZN) said late Tuesday that its first quarter profit more than doubled, sending shares of the company up more than 20 percent in Wednesday trading.

Shares of online broker E*Trade Financial Corp. (Nasdaq: ETFC) fell Thursday, a day after the firm’s first-quarter earnings report showed a profit that beat Wall Street expectations but also included lower guidance for the full fiscal year.

Shares of Mobius Management Systems Inc. (NASDAQ: MOBI) jumped on Thursday after it agreed to be acquired by Allen Systems Group, Inc. an enterprise software provider.

Shares of medical firm American Medical Systems Holdings, Inc. (NASDAQ: AMMD) plunged nearly 18 percent on Wednesday after the firm lowered its expectations for first quarter revenue.

Shares of drug maker Memory Pharmaceuticals Corp. (NASDAQ: MEMY), skyrocketed on Monday, after the company announced it had has completed enrollment for Phase IIa trials of its Alzheimer’s treatment on Thursday. The market was closed on Friday.

Biotechnology firm Cell Genesys Inc. (Nasdaq: CEGE) shares rose sharply Tuesday, after the company said its prostate cancer drug therapy showed better-than-expected results in a clinical trial.

Xerox Corp. (NYSE: XRS) announced on Monday that it would buy Global Imaging Systems (Nasdaq: GISX), sending shares of the Tampa-based company skyrocketing.

Shares in ICT Group Inc., dropped sharply on Friday after the company lowered its profit expectations for first quarter and the full-year 2007.

The Food and Drug Administration said on Thursday that Dendreon's (Nasdaq: DNDN) prostate cancer treatment was safe and effective, sending shares skyrocketing on Friday trading.

Shares in logistics firm UTi Worldwide Inc. (Nasdaq: UTIW) tumbled Thursday after the logistics firm reported that it’s earnings four the fiscal fourth quarter were short of expectations.

Shares of biotech firm Targeted Genetics Corp. (Nasdaq: TGEN) shot up Thursday it announced that fourth quarter revenues more than doubled.

Therapeutic device maker AngioDynamics (NASDAQ: ANGO), posted weaker than expected earnings on Wednesday, sending shares of the firm plummeting.

Shares of Nuvelo, Inc. (Nasdaq: NUVO) skyrocketed on Tuesday following news that drug maker's cancer drug was granted 'fast-track' status by the U.S. Food and Drug Administration.

CBRL Group, Inc. shares were down significantly on Tuesday after it reported poor March sales due to bad winter weather at its Cracker Barrel Old Country Store restaurants and gift shops.

Shares of Internet telephony company Vonage Holdings Group (NASDAQ: VG) tumbled this morning following a downgrade from Citigroup.

Shares of heart Biosite Inc. (Nasdaq: BSTE) skyrocketed more than 50 percent on Monday after biomedical lab instrument maker Beckman Coulter Inc. (NYSE: BEC) said it would acquire the firm for $1.55 billion.

Shares of computer maker Dell (Nasdaq: DELL) rallied today after investment bank Goldman Sachs upgraded the firm from to a buy rating from its previous neutral rating.