Updated from 1:02 p.m. EDT

Shares of

Synopsys

(SNPS) - Get Report

were among the worst-performing technology stocks Thursday after the company narrowly beat recently revised third-quarter earnings expectations and warned that fourth-quarter earnings and sales would fall well short of expectations.

The semiconductor design software maker posted a pro forma profit of 33 cents a share on sales of $281.7 million. Analysts surveyed by Thomson First Call were expecting earnings of 32 cents a share on sales of $285.8 million. On Aug. 2, Synopsys warned Wall Street that it would earn 31 cents to 34 cents a share in the third quarter, down from its previous guidance of 35 cents to 40 cents a share.

Looking ahead, Synopsys forecast fourth-quarter earnings of break-even to 4 cents a share on sales of $220 million to $240 million. Analysts were expecting earnings of 36 cents a share on sales of $311.4 million. Shares traded down $6.63, or 31.2%, to $14.65.

Applied Digital

( ADSX) rose after its

Digital Angel

(DOC) - Get Report

subsidiary signed an exclusive 10-year product supply and distribution agreement with Schering-Plough Animal Health. The new agreement will allow Schering-Plough Animal Health to continue to be the distributor of Digital Angel's electronic identification products throughout the U.S. The agreement calls for a 20% jump in purchases for 2005 and 2006. The volume increase is expected to result in significant revenue gains for Digital Angel. Shares of Applied Digital traded up 13 cents, or 6.3%, to $2.21.

Shares of

aQuantive

( AQNT) fell after the company said it would sell $70 million in convertible notes. The digital marketing services and technology company also granted purchases the right to buy an additional $10 million in notes. aQuantive plans to use the proceeds to redeem the convertible notes issued as part of its SBI.Razorfish acquisition. Any remaining proceeds will be used for general corporate purposes. Shares of aQuantive traded down 45 cents, or 4.9%, to $8.80.

Plug Power

(PLUG) - Get Report

rose after the company said its GenSys 5C fuel cell system had been certified by the California Air Resources Board as meeting the 2007 distributed emission standards requirement. California's Distributed Generation Certification Program certifies electrical generation technologies that are exempt from local air pollution permitting. Shares of Plug Power traded up 32 cents, or 6.3%, to $5.43.

Shares of

Convera

(CNVR)

fell after the company posted a wider-than-expected second-quarter loss. The search and categorization software company posted a loss of 21 cents a share on sales of $5.1 million. An analyst following the company expected it to lose 14 cents a share on sales of $8.6 million. The company's results were impacted by the timing of purchases by a few key prospects. Shares of Convera traded down 31 cents, or 12.2%, to $2.24.

Other technology volume leaders included

Lucent

( LU), down 6 cents to $3.08;

Nortel Networks

( NT), up 14 cents to $3.74;

Intel

(INTC) - Get Report

, down 21 cents to $22.01;

Cisco

(CSCO) - Get Report

, up 11 cents to $19.10;

Microsoft

(MSFT) - Get Report

, down 34 cents to $27.12;

Applied Materials

(AMAT) - Get Report

, down 28 cents to $15.88; and

Oracle

(ORCL) - Get Report

, down 9 cents to $10.42.