SAN FRANCISCO - Riding a hot streak that has doubled its stock price in three years, Hewlett-Packard is rolling the dice on a $13.2 billion acquisition of technology services provider Electronic Data Systems.

The all-cash deal, announced Tuesday, represents HP's biggest gamble under the leadership of Mark Hurd, who was hired as chief executive in March 2005 to turn around the maker of personal computers and printers.

Hurd has relentlessly cut costs while demanding better execution from the company's remaining workers. Meanwhile, HP has recovered from a nagging financial hangover that was exacerbated by the biggest acquisition in its 69-year history -- the $19 billion purchase of Compaq Computer, completed in 2002 over strident shareholder objections.

Now HP will try to show that it learned from its mistakes by making the second-largest deal in its history pay off more quickly.

Investors are worried that HP is taking an unnecessary risk on EDS, whose disappointing profit margins had caused its stock to drop by about 30 percent in the past year. HP shares sagged $2.56 Tuesday to finish at $44.27.

"It appears to be a very daunting deal," said American Technology Research analyst Shaw Wu.

The $25-per-share sale price represents a nice payoff for EDS stockholders, who will receive a nearly 33 percent premium compared with the company's share price before news of the HP talks leaked out Monday.

EDS shares added 26 cents to close at $24.34 Tuesday. Including EDS' net debt, HP values the acquisition at $13.9 billion.

Based on EDS' nearly 530 million common shares, restricted stock units and options, the sales prices works out to $13.2 billion. That represents about one-fourth of the $50 billion increase in HP's market value since Hurd joined the company.

HP prizes EDS because it wants to become a much bigger competitor in technology services -- a wide-ranging category that includes running computer data centers, stitching together software programs and consulting on special projects for business and government clients.

The estimated $550 billion market for technology services has long been dominated by IBM, which has about a 10 percent share. HP ranks a distant fifth with a 3 percent market share, based on its $16.6 billion in technology services revenue in its last fiscal year.

By picking up EDS' $22 billion in revenue, HP's technology services division will more than double in size and leapfrog to second place with a 7 percent market share. Fujitsu and Accenture will fall behind the combined HP-EDS.

HP passes IBM

HP has already surpassed IBM as the world's largest all-purpose technology company, based on revenue.

In a sign that Wall Street doesn't view HP's expansion as a major threat in technology services, IBM shares gained $1.34 to close at $126.58 Tuesday.

The EDS deal is expected to close during the second half of this year and begin boosting HP's earnings in its fiscal year ending in October 2010.

To wring more profit from the EDS takeover, HP indicated that it will make significant layoffs as it eliminates overlapping jobs and cuts other expenses. Hurd and EDS CEO Ronald Rittenmeyer declined to estimate how many workers might lose their jobs.

HP has eliminated about 15,000 jobs since Hurd took control.

"There are obviously going to be some changes," said Rittenmeyer, who will run the combined technology services unit and report directly to Hurd.

The combined services business would have 210,000 employees in more than 80 countries. It will retain the EDS brand and EDS' Plano, Texas, headquarters.

Though HP likely will be a more imposing force in technology services, it may lack the heft to tackle the types of complex projects that IBM regularly handles, even after the deal closes, said Yankee Group analyst Zeus Kerravala.

But EDS' emphasis on more lucrative projects, such as helping companies develop software applications, will likely help HP, which so far has focused on hardware maintenance.

EDS has been considered "technology agnostic," meaning it doesn't favor particular vendors when it recommends computer gear and software to customers.

If EDS starts to favor HP computers and software under its new ownership, that could deal a blow to Sun Microsystems, said Forrester Research analyst Christine Ferrusi Ross. That's because EDS buys a lot of Sun equipment to power the data centers that it runs for its customers.

Trying to keep talent

As in most technology acquisitions, HP's biggest challenge as it tried to absorb EDS will likely be retaining top talent and minimizing other disruptions.

Services companies are particularly tricky to integrate because they tend to develop quirky cultures. IBM, for instance, needed several years to absorb its $4 billion acquisition of PricewaterhouseCoopers' consulting arm in 2002.

And HP's acquisition of Houston-based Compaq was partially undermined by the cultural clashes that flared between employees in Silicon Valley and Texas. Because EDS also is based in Texas, some of the same cultural hurdles may arise, analyst Kerravala said.

Founded in 1962 by former IBM salesman -- and later two-time presidential candidate -- H. Ross Perot, EDS caused headaches for a previous acquirer, General Motors, which paid $2.5 billion in 1984. Perot became so disillusioned with how that deal worked out that he sold his remaining EDS shares to the automaker so he could start a new rival bearing his name.

GM spun off EDS as an independent company in 1996 and remained its largest customer.