By Dan Gallagher, MarketWatch

SAN FRANCISCO (MarketWatch) -- A surge for Netflix Inc. and strong gains for Apple Inc., Lexmark International Inc. and ARM Holdings gave a boost to the tech sector on Tuesday morning.

The Nasdaq Composite Index (RIXF) rose 1% to 3,268, while the Philadelphia Semiconductor Index (SOX) rose 2% and the Morgan Stanley High-Tech Index (MSH) rose 1.3%.

Netflix (NFLX) was the undisputed leader, with its shares soaring more than 24% to $218.81. On Monday afternoon, the movie streaming firm reported better-than-expected results for the first quarter, driven by the addition of more than 3 million total streaming subscribers. Its forecast was also ahead of expectations.

"Netflix put together a second straight quarter of strong results and we continue to believe the company is back on track toward significantly disrupting the linear TV market," wrote Doug Anmuth of J.P. Morgan in a note to clients. He raised his price target on the stock to $254 from $205.

Apple (AAPL) shares rose 1.8% to $405.85 ahead of its own earnings report, due after the closing bell.

In a note to clients on Tuesday, Scott Thompson of FBR Capital Markets lowered his price target on the stock to $525 from $625, keeping his outperform rating as he feels the shares are "attractively valued" at their current level.

"However, we continue to struggle with the thought that the next catalyst to get shares headed in an upward trajectory remains elusive," he wrote.

Lexmark (LXK) shares jumped more than 7% to $27.40 after the printer maker reported results that were ahead of its previous forecast. The company projected a 6%-8% drop in revenue for the current quarter; analysts were modeling an 8% drop for the period.

The U.S.-listed shares of ARM Holdings (ARMHY) jumped more than 13% following the company's first-quarter report, which beat forecasts. ARM provides basic semiconductor designs for use in mobile devices.

Shares of Texas Instruments (TXN) also were up more than 2% after the chip maker posted upbeat results, and pointed to strengthening demand in the automotive and industrial markets.

Shares of Sanmina Corp. (SANM) also traded up more than 13% after the company swung to a profit in its fiscal second quarter.

On the other hand, shares of Molex Inc. (MOLX) slipped more than 5% after the electronics-component company posted weaker-than-expected earnings.

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