Updated from 2:24 p.m. EDT

Shares of Intrado ( TRDO) were among the worst-performing technology stocks Thursday after the emergency-communications company said second- and third-quarter earnings and sales would be below expectations.

Citing a one-quarter delay in license revenue and a writedown of capitalized software costs, Intrado is now expected to earn 1 cent to 3 cents a share, compared with previous guidance of 16 cents to 22 cents a share. Sales, meanwhile, are now expected to be between $32 million and $32.5 million, below previous expectations of $33.8 million to $35.1 million. Looking ahead, it now expects third-quarter earnings of 8 cents to 22 cents a share on sales of $32.5 million to $35.9 million.

Analysts polled by Thomson First Call had expected second-quarter earnings of 18 cents a share on sales of $34.4 million and third-quarter earnings of 25 cents a share on sales of $37 million. Shares of Intrado traded down $3.96, or 26.7%, to $10.85.

Planar Systems ( PLNR) rose after it posted stronger-than-expected third-quarter earnings and sales. Though its earnings fell 39% from a year ago, profit of 18 cents a share easily beat expectations of 13 cents a share. Sales of $66.7 million were stronger than the $64 million analysts had expected. Looking ahead, Planar expects earnings of 15 cents to 20 cents a share during the fourth quarter on sales of about $70 million. Analysts are looking for it to earn 19 cents a share on sales of about $73.5 million. Shares of Planar Systems traded up $2.03, or 16.8%, to $14.09.

Modem Media ( MMPT) rose after it agreed to be acquired by Digitas ( DTAS) for about $200 million in stock. Digitas expects the acquisition to be accretive during the first calendar year after the transaction closes. Separately, Modem Media announced second-quarter pro forma earnings of 7 cents a share on sales of $15.9 million. Analysts had expected it to earn 5 cents a share on sales of $16.6 million. Shares of Modem Media traded up $1.12, or 26.1%, to $5.42.

Shares of SanDisk ( SNDK) soared after the flash-memory maker reported blowout second-quarter earnings . It earned 38 cents a share on sales of $433.3 million. Analysts had expected it to earn 30 cents a share on sales of $410.9 million. Looking ahead, SanDisk expects third-quarter sales of between $440 million and $460 million. Analysts are looking for it to post sales of $445.5 million. Shares of SanDisk traded up $4.11, or 20.6%, to $24.09.

Other technology volume leaders included Intel ( INTC), down 23 cents to $23.15; Nokia ( NOK), down $1.79 to $12.45; Oracle ( ORCL), down 7 cents to $10.72; Microsoft ( MSFT), down 26 cents to $27.87; Cisco ( CSCO), up 3 cents to $22.13; Advanced Micro Devices ( AMD), down 77 cents to $12.97; and Lucent ( LU), down 7 cents to $3.41.

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