Updated from 12:44 p.m. EDT

Shares of

Leadis Technology

(LDIS)

were among the worst-performing technology stocks Friday, falling 48.1% after the company posted third-quarter results and warned that fourth-quarter earnings would fall short of expectations.

The semiconductor maker posted pro forma third-quarter earnings of 20 cents a share on sales of $40.9 million. Analysts polled by Thomson First Call were expecting earnings of 19 cents a share. Looking ahead, the company forecast fourth-quarter earnings of 10 cents to 12 cents a share on sales of $33 million to $36 million. Analysts are expecting earnings of 17 cents a share on sales of $44.7 million. Leadis said it expects lower sales of its OLED drivers to hamper fourth-quarter results. Shares traded down $8.15 to $8.79.

Google

(GOOG) - Get Report

rose 15.4% after the company delivered strong first-quarter earnings and sales. Excluding several items, the Web search company posted earnings of 70 cents a share on sales of $805.9 million. Excluding traffic acquisition costs, Google delivered $503 million in sales. Analysts were expecting earnings of 56 cents a share on sales of $454 million. Shares traded up $23.05 to $172.43. Shares of Google have more than doubled since going public in August at $85 a share.

Shares of

EMS Technologies

(ELMG)

fell 5.7% after the company warned that third-quarter results would fall short of expectations. The wireless communications company expects earnings of 5 cents to 8 cents a share on sales of $62 million to $64 million. Previously, the company said that it would earn 18 cents to 22 cents a share on sales of $71 million to $73 million. Analysts had been expecting earnings of 20 cents a share on sales of $72 million.

Third-quarter results were hurt by weakness in its wireless division, which was affected by an "industrywide slowdown in the wake of major consolidation activity among the wireless carriers," the company said. Shares traded down $1 to $16.50.

Secure Computing

(SCUR)

fell 15.6% after the company warned that fourth-quarter earnings and sales would fall short of expectations. The software maker earned 10 cents a share during the third quarter on sales of $24.5 million. Analysts were expecting earnings of 10 cents a share on sales of $24.3 million. Looking ahead, the company forecast fourth-quarter earnings of 10 cents a share on sales of $24.5 million. Analysts are expecting earnings of 11 cents a share on sales of $25.7 million. Shares traded down $1.45 to $7.85.

Shares of

WebEx Communications

(WEBX)

fell 20.6% after the company posted mixed third-quarter results and warned that fourth-quarter sales would come in slightly below expectations. The Web conferencing company earned 26 cents a share during the third quarter on sales of $63.96 million.

Analysts were expecting earnings of 22 cents a share on sales of $64.1 million. Looking ahead, WebEx said it would post earnings of between 23 cents and 26 cents a share on sales of $65.5 million to $67.5 million. Analysts had been expecting earnings of 23 cents a share on sales of $67.8 million. Shares traded down $5.52 to $21.28.

Other technology volume leaders included

Microsoft

(MSFT) - Get Report

, down 82 cents to $27.74;

Lucent

(LU)

, unchanged at $3.51;

Intel

(INTC) - Get Report

, down 39 cents to $21.30;

Sirius Satellite Radio

(SIRI) - Get Report

, up 7 cents to $3.91;

Cisco

(CSCO) - Get Report

, down 36 cents to $18.27; and

Applied Materials

(AMAT) - Get Report

, down 42 cents to $15.96.