Akamai Technologies Inc., Citrix Systems Inc. and other technology companies tumbled in extended trading yesterday after they forecast profit that missed analysts’ estimates.

Akamai, which operates a server network that lets businesses speed the delivery of data, fell as much as 15 percent late yesterday. Citrix, a computer-networking software maker, dropped 8.1 percent. TriQuint Semiconductor Inc. and Shutterfly Inc. also declined after reporting earnings.

The largest computer hardware and software companies, including International Business Machines Corp., Microsoft Corp. and SAP AG, are outperforming smaller vendors, said Israel Hernandez, a Barclays Capital analyst. That’s because they’re better able to draw on large groups of customers and sales leads when some clients hold back on spending, he said.

“The one consistent thing is the bigger global vendors did better,” the San Francisco-based analyst said. “When things get a little tight, they just have a lot more to work with.”

Akamai’s third-quarter profit will be 31 cents to 34 cents a share, excluding some items, Chief Financial Officer J.D. Sherman said yesterday on a conference call. That compares with an average analyst estimate of 38 cents. The Cambridge, Massachusetts-based company expects sales of $273 million to $283 million, compared with a projection of $288.7 million.

Mounting Competition

Akamai, whose customers include Apple Inc. and Netflix Inc., provides services such as application acceleration and cloud-computing security. The company faces more competition from Limelight Networks Inc. and Level 3 Communications Inc., said Chad Bartley, an analyst at Pacific Crest Securities Inc. in Portland, Oregon.

Akamai expects 10 percent to 13 percent growth in revenue for the year, Sherman said. Analysts on average had projected 14 percent sales growth, according to Bloomberg data.

“There are more solutions, more alternatives to Akamai,” said Bartley, who has a “sector-perform” rating on the stock and doesn’t own it. “We are seeing more pricing pressure.”

Citrix, based in Fort Lauderdale, Florida, said per-share profit this quarter will be 56 cents to 58 cents a share, less than the 61 cents analysts had estimated.

Symantec Corp. and LSI Corp. bucked the trend, delivering earnings that sent shares up in late trading yesterday.

Symantec, the largest maker of computer-security software, forecast higher profit and sales than analysts had predicted, lifted by businesses spending more to fight hacking.

Rosy Forecast

Excluding some costs, profit will be 38 cents to 39 cents this quarter, Mountain View, California-based Symantec said yesterday. That compares with a 38-cent average estimate, according to Bloomberg data. Sales will be $1.66 billion to $1.68 billion, topping the consensus projection of $1.61 billion. Symantec shares rose as much as 4.2 percent to $19.18 in extended trading yesterday.

LSI, a maker of chips used in computer disk drives, forecast third-quarter sales from continuing operations of $535 million to $565 million. Analysts had predicted $510.7 million on average. The strong forecast reflects market share gains, said Abhi Talwalkar, chief executive officer of the Milpitas, California-based company. LSI shares rose as much as 81 cents, or 13 percent, to $7.25.

TriQuint, a Hillsboro, Oregon-based maker of communications chips, gave sales and profit forecasts for the current period that trailed analysts’ estimates. The company’s shares slid as much as 21 percent in extended trading. Redwood City, California-based Shutterfly, a Web-based photo-sharing service, also forecast lower sales and a wider loss than analysts had projected, sending its shares down 8.7 percent.

HomeAway Inc., an online vacation-rental service, posted its first quarterly results yesterday since its initial public offering last month. The Austin, Texas-based company said second-quarter profit fell 85 percent, dragged down by marketing expenses. Net income dropped to $2.2 million from $14.9 million a year earlier. Sales rose 41 percent to $58.7 million.

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