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NEW YORK (MarketWatch) -- Shares of the following companies were among those that made noteworthy moves in the U.S. stock market Friday:

Advancers

Amazon.com shares gained nearly 5% after a Bernstein Research analyst upgraded the online retailer to a buy rating. Read The Ratings Game.

CEL-SCI Corp. shares more than 19% after the vaccine developer said it was starting clinical tests of an experimental immunology therapy for the H1N1 virus. See Biotech Stocks.

Electronic Arts Inc. shares rose 4.6%, with the game publisher slated to release its quarterly results after the closing bell Monday. See detailed story.

General Electric Co. shares rose 6.3% after brokerage firm Oppenheimer upgraded the conglomerate to outperform from perform. See full story.

International Game Technology shares jumped 9% after the maker of slot machines reported a fourth-quarter loss but said demand has stabilized. .

JDS Uniphase Corp. shares gained 8.7% after the telecom equipment maker's quarterly results topped expectations. .

K12 Inc. shares climbed nearly 14% after the educational services provider raised its forecast and reported first-quarter profit climbed almost 20%. .

Lennar Corp. shares climbed 4.7% after shares of the home builder were upgraded to outperform from neutral by Credit Suisse.

Macy's Inc. shares gained 6.4% after an analyst upgrade of the department-store operator. Read Retail Stocks.

MBIA Inc. shares added 6.6%. Read Financial Stocks.

NVIDIA Corp. shares climbed 7.3% after the maker of chips for computer graphics reported 74% growth in quarterly earnings. See story.

Starbucks Corp. shares gained 7.2% after the caffeine retailer reported better-than-expected results and forecast. Read more about Starbucks.

Zymogenetics Inc. shares rose almost 11% after the biotechnology company trimmed its third-quarter loss by more than 50%. Read Biotech Stocks.

AC Moore Arts & Crafts Inc. shares plunged 15% after the home goods retailer reported a far greater-than-expected quarterly loss. .

American International Group Inc. shares fell 9.7% after the troubled insurer noted continued declines in sales at some of its main businesses. Read story.

bebe stores inc. shares fell 8.4% after the women's clothing retailer offered a forecast that fell short of expectations. Read Retail Stocks.

Fannie Mae shares declined 7.1% after the embattled mortgage lender posted a third-quarter loss and asked the government for more assistance. See story.

Fortress Investment Group shares dropped 9.6% after the company said that its third-quarter loss shrank to $190.3 million, or 43 cents a share, from a loss of $267.5 million, or 66 cents a share. .

Omrat Technologies Inc. shares fell 6% after Jefferies & Co. downgraded the company, which builds and operates geothermal plans.

Sunoco Inc. shares fell 9.4% after an analyst cut his earnings outlook for the oil refinery company. .