(Updated from 6:16 p.m. EST)

The plethora of corporate warnings that weighed down daytime trading remained like a vise on the after-hours trading session as the very same names from the day hogged the list of losers. And the extended-hours market dutifully punished some companies that came out with after-the-bell earnings confessions.

Tech Data

(TECD) - Get Report

, a distributor of microcomputer products, recently dropped 10.7% to $23.50 on

Instinet

, despite posting fourth-quarter earnings that exceeded analysts' expectations. Shares of the Clearwater, Fl.-based company recently slid 3.09% to $25.50 on the

Island

ECN trading platform, as investors reacted to its reduced sales outlook for the first quarter, which comes amid "the widely reported slowdown in IT spending."

Likewise,

JNI

(JNIC)

took a sharp tumble after it guided down its first-quarter outlook, blaming the limp tech sector as well as the slowdown in

Sun Microsystems'

(SUNW) - Get Report

server sales. JNI shares lost 12.33% $8 on Island, while Sun, which reached a new 52-week low of $15.50 during the day, recently lost 0.44% to $15.78.

The weakness in high tech certainly impacts the storage networkers and makers of infrastructure products. Fellow storage networker

Emulex

(EMLX)

was lately off 1.62% to $19 on Island.

In other selling,

Qualcomm

(QCOM) - Get Report

lost 2.74% to $53.31 on Island, off from its regular-session close, after

CIBC World Markets

cut its numbers on the CDMA (code-division multiple access) technology pioneer, according to a media report.

And still no high fives for

Palm

(PALM)

, whose shares remained stuck in red from last night's earnings warning. The stock, one of the most actively traded on both platforms, recently fell 0.8% to $8 after scraping a new 52-week low of $7.88 during a dreadful daytime selloff that saw it lose 48.4%.

No respite for the telecom equipment makers either. All day, they were stung by

Nortel Networks'

(NT)

bad confession, which came after the bell Tuesday. While Nortel wasn't active in extended-hours trading, compatriots

Juniper Networks

(JNPR) - Get Report

and

Cisco Systems

(CSCO) - Get Report

weren't so lucky. On Island, Juniper began trading down but had lately climbed 0.21% to $43.98. Cisco was off 0.40% to $15.69.

Even though sellers outpaced buyers, some blue-chip tech names on Instinet managed a climb into the green.

Oracle

(ORCL) - Get Report

and

Intel

(INTC) - Get Report

were both up, while

Nokia

(NOK) - Get Report

, a company caught deep in the telecom slowdown, recently climbed 5.8% to $26.

Investors on Instinet also sent the triple Qs, or the

Nasdaq 100

(QQQ) - Get Report

, up 0.1% to $39.72.

Looking ahead to tomorrow, both the

S&P 500

and

Nasdaq 100

futures on

Globex

pointed to sluggish starts for the market tomorrow. The S&P 500 futures were about 1.3 points below fair value, while the Nasdaq 100 futures were down about 3 points from fair value.

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 offers trading, mainly in Nasdaq-listed stocks, from 7 a.m. to 8 p.m. EST.

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.