By Dan Gallagher, MarketWatch

SAN FRANCISCO (MarketWatch) -- Strong gains by Google Inc. and International Business Machines Corp. in the wake of fourth-quarter earnings reports gave a boost to the overall tech sector Wednesday.

Shares of Apple Inc. and Netflix Inc. posted gains ahead of their results, due after the closing bell.

The Nasdaq Composite (RIXF) rose 0.3% to 3,152 by midday, while the Philadelphia Semiconductor Index (SOX) added 0.4% and the Morgan Stanley High-Tech Index (MSH) gained 0.3%.

Google (GOOG) led the way, its shares gaining nearly 6.5% to trade at $747.80. The Web search giant posted strong gains in earnings and revenue for the fourth quarter, showing improvement in its core ad business as well as continued losses from its Motorola handset business.

"Google's Q4 metrics helped calm the biggest Google bear case: that all-things-mobile were eroding its financial position," wrote analyst Evan Wilson of Pacific Crest Securities. He lifted his Google price target to $820 from $795.

IBM (IBM) shares also rose, up 5% to $205.76, rallying as the Dow Jones Industrial Average component reported late Tuesday a gain in fourth-quarter profit and projected an earnings-per-share target for 2013 above Wall Street's consensus estimate.

Citigroup analyst Jim Suva called IBM the "best" company for IT hardware and services. In a note to clients, he cited its "best-in-class portfolio of products and services," maintaining a buy rating and a $250 price target on Big Blue.

Apple (AAPL) shares moved up 1% to $510.02, as the company got set to report results for the first quarter of fiscal 2013 after the close.

Analysts are expecting sales of about 48 million to 50 million iPhones, though some are worried that the company's forecast may show weakening demand for the smartphone.

Apple's gains were significant as the stock makes up roughly 4% of the S&P 500 (SPX) 10% of the Nasdaq Composite Index and 15% of the Nasdaq-100.

Netflix (NFLX) shares rose 4% to $101.75. In its fourth-quarter report, investors are likely to focus in on subscriber additions to the company's domestic streaming business.

Also Wednesday, Advanced Micro Devices (AMD) jumped more than 9% to $2.69 following its own fourth-quarter results, while Cree (CREE) surged more than 19%. Texas Instruments (TXN) was down 1% following results issued late Tuesday.

Motorola Solutions (MSI) and Molex (MOLX) were each down 2% following their own earnings reports on Wednesday morning. Symantec (SYMC) shares rose by 2%.

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