By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks put in a slightly negative performance Tuesday as investors reacted to Netflix Inc.'s quarterly results and Cisco Systems Inc.'s deal to buy network-security software company Sourcefire Inc. for $2.7 billion.

Apple Inc. (AAPL) ended the day in the red, but shares jumped more than 5% in after-hours trade after the company reported third-quarter results that beat Wall Street's estimates thanks to stronger-than-expected iPhone sales.

Netflix (NFLX) closed with a loss of 4.5%, at $250.26 a share, after new-subscriber numbers during its second quarter failed to meet expectations. Netflix said it added 630,000 new subscribers in the U.S. during the quarter, but Wall Street analysts had expected as many as 800,000 new additions due to the launch of programming such as a new season of "Arrested Development."

The new-subscriber numbers took some of the shine off the rest of Netflix's results, as the company reported earnings that more than quadrupled from the year-ago period.

Cisco (CSCO) shares slipped 16 cents to close at $25.56 after the company said it would acquire Sourcefire(FIRE) for $76 a share. Sourcefire shares rose almost 28%, to close at $75.49, after the deal was announced.

Apple (AAPL) shares were up 5% in after-hours trade on Tuesday. Shares had ended the day down 1.7% at $418.99 ahead of the company's third-quarter earnings release, which came after market close. For the period ended June 29, Apple reported net income of $6.9 billion, or $7.47 per share, compared with net income of $8.8 billion, or $9.32 per share, for the same period last year. Follow Apple's conference call on our live blog here.

Printing-technology company Lexmark International Inc. (LXK) shares jumped more than 5% to close at $36.43. Before the market opened, Lexmark reported second-quarter earnings and sales that surpassed both the company's and Wall Street analysts' consensus estimates.

Texas Instruments Inc. (TXN) also had a good day, rising more than 4% to close at $38.93 a share. On Tuesday, the chipmaker reported a gain in second-quarter earnings and forecast better-than-expected results for its third quarter. TI attributed its performance to strength in areas such as the industrial and automotive markets.

Yahoo Inc. (YHOO) slipped by almost 2% to $27.36. Needham & Co. analyst Laura Martin cut her rating on Yahoo to hold from buy, citing "higher risks" in the wake of Third Point selling back nearly all of its Yahoo shares and its three directors leaving the Yahoo board.

The Nasdaq Composite Index (RIXF) fell 21 points to end the day at 3,579. The Philadelphia Semiconductor Index (SOX) and the Morgan Stanley High Tech 35 Index (MSH) also closed with small losses.

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