Updated from 12:38 p.m. EDT

Shares of Netegrity ( NETE) were among the best-performing technology stocks Wednesday after the company agreed to be acquired by Computer Associates International ( CA).

CA will pay Netegrity shareholders $10.75 a share in cash, or about $430 million. The buyout price represents a premium of 39% over Tuesday's closing price of $7.75. The acquisition is expected to be neutral to earnings in fiscal 2005 and slightly accretive in 2006. The deal is expected to close in the next 90 days. Shares of Netegrity, a security software maker, traded up $2.79, or 36%, to $10.54; shares of CA traded up 46 cents to $27.85.

Sirius Satellite Radio ( SIRI) rose 15.5% after the company announced that shock jock Howard Stern would be moving to Sirius' satellite radio system beginning in January 2006. The five-year, multimillion-dollar deal will allow the radio personality to take his show "to a whole new level as I bring my fans my show, my way," Stern said. According to Sirius, total production and operating costs are estimated at $100 million a year. Sirius estimates it would need to generate about 1 million subscribers to cover the costs of the deal. Shares traded up 52 cents to $3.87.

Shares of Zoran ( ZRAN) fell 10.4% after the company cut its third-quarter earnings and sales forecast. The chipmaker now expects earnings of 11 cents to 14 cents a share on sales of $115 million to $119 million. Previously, the company forecast earnings of 27 cents to 30 cents a share on sales of $128 million to $133 million. Analysts polled by Thomson First Call had been expecting earnings of 28 cents a share on sales of $130.2 million. Zoran blamed an inventory correction in the Chinese-manufactured DVD player market and tighter credit lines within China. The company will report its third-quarter results Oct. 26. Shares traded down $1.69 to $14.56.

Open Text ( OTEX) fell 20.8% after the company warned that its first-quarter earnings and sales would miss expectations. Excluding items, the software maker now expects to post a profit of 3 cents to 6 cents a share, down from previous guidance of 7 cents to 12 cents a share. Sales are now expected to be between $84 million and $86 million, down from previous guidance of $87 million to $93 million. Analysts had been expecting earnings of 11 cents a share on sales of $89.4 million. The company said that several deals failed to close during the quarter, leading to the earnings and sales revision. Shares traded down $4.17 to $15.88.

Shares of Credence Systems ( CMOS) fell 3.9% after the company cut its fourth-quarter earnings and sales guidance. The chip-equipment maker now expects to post a loss of 17 cents to 21 cents a share on sales of $110 million to $115 million. Previously, Credence forecast earnings of 5 cents to 10 cents a share on sales of $140 million to $150 million. Weak business conditions that Credence observed in its Asian subcontractors at the end of the third quarter broadened into other segments of its customer base during the fourth quarter, it said. What's more, previous fourth-quarter guidance included new business that Credence expected to gain; that new business failed to materialize, Credence said. The company expects to release fourth-quarter earnings results on Dec. 1. Shares of Credence traded down 30 cents to $7.39.

Other technology volume leaders included Lucent ( LU), up 8 cents to $3.20; Intel ( INTC), down 19 cents to $21.13; Microsoft ( MSFT), up 15 cents to $28.53; Cisco ( CSCO), up 43 cents to $19.53; and Oracle ( ORCL), up 3 cents to $12.24.

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