(Updated from 6:56 p.m. EDT)

As the sun set over Wall Street's skyline, stargazing investors packed some heat into the last after-hours session in August, with technology issues among the most actively traded stocks.

While giants

JDS Uniphase

(JDSU)

and

Cisco

(CSCO) - Get Report

were among the most actively traded issues on

Instinet

, a lesser known tech concern,

Immersion

(IMMR) - Get Report

, emerged as the platform's biggest gainer.

On paper-thin volume,

Immersion

(IMMR) - Get Report

-- which manufactures hardware and software technologies that let users interact with computers using the sense of touch -- rallied $12.13, or 70.8%, to $29.25. Immersion ended the regular session higher by 75 cents, or 4.6%, to $17.13.

Although the company did not release any news, an article in today's

New York Times

plugged the software developer, saying that "just about everybody" uses Immersion's TouchSense technology.

Day or night, a profit warning is not good for a company's stock price. Tonight,

Viant

(VIAN)

is the latest victim of that preannouncement fate.

After the close Thursday, the Internet consulting firm warned that it expects to report a loss for the third quarter of 2000. The company attributed the revenue shortfall to the perception that "many Global 2000 companies have slowed down their e-business initiatives and have taken the opportunity to step back and revisit their strategies."

Wall Street had expected Viant to come in at 8 cents a share. The company expects revenue for the third quarter to fall about 12% to 15% below the $38.5 million revenue figure reported for the second quarter. In the third quarter of 1999, Viant reported revenue of $18.8 million and net income of 3 cents a share. Viant shares tumbled $3.19 to $10 in after-hours

Island

trading and plunged $3.94 to $9.94 on

Instinet

. They ended the regular session down 63 cents to $13.88. (

TST Recommends

TSC

covered Viant's

news in a separate story.)

On the upside, investors in extended hours trading raised their mugs for

Starbucks'

(SBUX) - Get Report

same-store sales results. Actively trading on

Instinet

, the high-end coffee merchant bounced to $37.38 from its $36.63 close, with 70,000 shares of the cappuccino king changing hands.

This morning, Starbucks announced that same-store sales rose 10% during the four-week period ended Aug. 27, compared with the year-ago period. The company reported revenue of $183 million for the last month, an increase of 35% from that time last year.

Rocking the Island ECN tonight were shares of biotechnology firm

Ecogen

(EECN)

-- 575,774 of them are already in play. Today, the company -- which markets environmental products for pest control -- announced that one of its products was chosen by

Pharmacia

(PHA)

unit

Monsanto

to be the active ingredient in its new insect resistant cotton.

Upon approval by the government and Monsanto, revenue produced by Monsanto from the cotton would be subject to commercialization fees due Ecogen, according to a 1996 agreement between the two companies. (Read: Big bucks for Ecogen.) Ecogen shares gained 15 cents to $1.03.

After-hours investors tonight were hooked on

Symphonix Devices

(SMPX)

. Today, the

Food and Drug Administration

approved Symphonix's surgically implanted hearing device for adults with moderate to severe hearing loss.

On Island tonight, 414,465 shares of the medical device manufacturer came in loud and clear. Symphonix swelled to a melodious $6.75 from its closing price of $5.16.

This information is provided by Instinet, a wholly owned subsidiary of Reuters (RTRSY) . For further information, please contact Instinet at www.instinet.com.

Island ECN, owned by Datek Online, offers trading, mainly in Nasdaq-listed stocks, from 7 a.m. to 8 p.m. EDT.

Confused?

TheStreet.com

explains how the rules change when the sun goes down in Investing Basics: Night Owl, a section devoted to after-hours trading.