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Thursday's Late Winners & Losers

Mamma.com shares dive on a wider first-quarter loss.

Stocks were mixed after the bell Thursday, with a number of the big movers coming from the tech sector.

Chipmaker

Nvidia

(NVDA) - Get NVIDIA Corporation Report

of Santa Clara, Calif., climbed 4.8% on non-GAAP income of $164.4 million, or 42 cents a share, for the quarter ended April 29. This is 44.8% higher per share than last year and tops analysts' estimates by 3 cents, according to Thomson Financial. Revenue also came in slightly ahead of targets. Shares were up $1.59 to $34.41 in recent after-hours trading.

Among the biggest postclose losers, however, was another tech stock --

Mamma.com

(MAMA)

. Shares plunged 15.9% at $4.67 after the Canadian search engine operator

widened its first-quarter loss

to $1.4 million, or a dime a share, from 6 cents a share last year.

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Hi-def TV maker

Syntax-Brillian

(BRLC)

slid 14.3% to $7.21 after its fiscal third-quarter profit of 9 cents a share wasn't up to snuff with Wall Street expectations, despite reversing a big year-ago loss. The Tempe, Ariz., company separately announced a $172 million stock offering, mostly from the company itself but also from "certain of its stockholders."

Elsewhere in the tech sector, California-based

THQ

(THQI)

, an entertainment-software developer, expects to lose 26 cents a share in the next quarter, excluding stock-based compensation costs, vs. analysts' expectations for a dime-a-share loss. Shares sank 4.8%, or $1.65, to $33.04 after news of the guidance.

Also among the after-hours decliners was

American International Group

(AIG) - Get American International Group, Inc. Report

, a New York-based insurer, which slipped 30 cents to $71.90 despite besting top- and bottom-line first-quarter estimates.