Investors were mainly bidding up tech stocks in extra-session trading Wednesday, as a security software maker bolted higher, as did an Internet and media giant.

Symantec

(SYMC) - Get Report

, the maker of Norton Antivirus, among other products, was up 8.2% to $37.50 after the company

beat fourth-quarter estimates and raised its guidance for 2003. Meanwhile,

AOL Time Warner

(AOL)

, which posted a mammoth loss, rose 3.6% to $20 despite cutting its

cash-flow targets for the rest of the year.

Intersil

(ISIL)

was up after the maker of analog and communications chips offered its latest

quarterly report and guidance, while

On Semiconductor

(ONNN)

dropped 14.9% to $5.10 after disclosing plans to sell more stock.

Among other active, widely held issues, the

Nasdaq 100 Unit Trust

(QQQ) - Get Report

was inching up 0.2% to $32.55.

Cisco

(CSCO) - Get Report

was gaining 0.3%, and

WorldCom

(WCOM)

was flat.

Intel

(INTC) - Get Report

,

Microsoft

(MSFT) - Get Report

and

Oracle

(ORCL) - Get Report

were all fractionally higher.

Simplex Solutions

(SPLX)

was the big percentage winner, jumping 41% to $17.35 on news that

Cadence Design

(CDN)

will acquire the company for $18 a share in a deal valued at about $300 million. Simplex ended

regular trading at $12.30. Another winner was

ESS Technology

(ESST)

, which rose 14% to $20.45 after beating Wall Street's expectations for the latest quarter.

The losers included

Cytyc

(CYTC)

, which dropped 15.4% to $20.99, after the medical diagnostic products maker posted earnings, and

F5 Networks

(FFIV) - Get Report

, which lost 12% to $11.50 following the revelation that previous third-quarter targets were too high.