By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks generally advanced Thursday, with kingpin Apple Inc. gaining following a buyback proposal from investor Carl Icahn, but several notable losses came after earnings or forecasts from the likes of Fusion-io Inc. and Symantec Corp.

Apple (AAPL) rose $1.29 a share to reach $526.25 after Icahn published a letter he sent to Apple Chief Executive Tim Cook in which he outlined a proposal for the company to buy back $150 billion worth of its stock.

In the letter, Icahn lauded Cook and Apple, and said his only major criticism with the company comes from "the size and timeframe of Apple's buyback program. It is obvious to us that it should be much bigger and immediate."

Several other tech stocks were getting punished by investors in the wake of their late-Wednesday quarterly reports.

Fusion-io Inc. (FIO) shares slumped almost 26% to $9.64, after the data-storage technology company reported disappointing quarterly results and gave a weak outlook, and said that Chief Financial Officer Dennis Wolf is leaving the company. J.P. Morgan analyst Mark Moskowitz cut his rating on Fusion-io's stock to underweight, or sell, from neutral.

Symantec (SYMC) was down 11.5% at $21.79 a share, as the security software company reported a decline in its fiscal second-quarter sales and lowered its full-year forecasts.

Akamai Technologies Inc. (AKAM) fell 10.5% to $46.40 after the Internet content-delivery company said its upcoming results could be affected by pricing negotiations on a new contract with its largest customer, Apple.

Angie's List Inc. (ANGI) gave up almost 3%, to trade at $15 a share, after the online professional-services referral company reported weaker-than-expected third-quarter sales and gave a revenue forecast that fell short of Wall Street analysts' estimates.

However, the Nasdaq Composite Index (RIXF) rose 11 points to 3,918. Gains came from sector leaders such as Microsoft Corp. (MSFT) and Amazon.com Inc. (AMZN)

Microsoft is scheduled to report its fiscal first-quarter results after the close of trading Thursday. It will be the first time Microsoft has given a quarterly report since CEO Steve Ballmer said in August that he would retire and the company agreed in September to acquire Nokia Corp.'s (NOK) mobile-handset business.

Amazon also is to report quarterly results after the market closes.

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