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Stocks were mixed after hours Tuesday, with tech companies dominating the news on both sides of the coin.

For starters, there was

(AMZN) - Get Free Report

. Shares of the Seattle-based online retailer of books, music and other products were leaping 11.9% to $50.07 in very active trading after first-quarter profits

more than doubled

to $111 million, or 26 cents a share. Analysts polled by Thomson Financial were looking for just 15 cents.

Semiconductor firm


( ZRAN), of California, climbed 11.1% to $21 after likewise reporting non-GAAP earnings that more than doubled to 19 cents a share.

Riverbed Technology


posted better-than-expected top and bottom lines, and Oregon's


(PXLW) - Get Free Report

, a small-cap semiconductor, lost 2 cents less per share than analysts had forecast. Riverbed was up 11.6% at $31.55; Pixelworks was gaining 10.1% to $1.65.

A mixed bag of companies, among them

CH Robinson Worldwide

(CHRW) - Get Free Report

, composed the rest of Tuesday's postbell winners. The freight-transportation-services company rode high after first-quarter income jumped 27.3% year over year to 42 cents a share, topping estimates by 4 cents. Shares of the Minnesota-based company rose 5.6% to $54.

Also turning in positive first-quarter results after hours were


(ILMN) - Get Free Report

, a San Diego-based biotech that rose 3.8% to $34; restaurant chain

Cheesecake Factory

(CAKE) - Get Free Report

, lately up 3.8% to $27.01; and baby-apparel maker


(CRI) - Get Free Report

, adding 55 cents, or 2.1%, to $26.52.

Sun Microsystems

(SUNW) - Get Free Report

, meanwhile, lead the tech losers after the close and saw heavy trading volume after

missing sales targets with revenue of $3.28 billion. Analysts were seeking $137.7 million more. The Santa Clara, Calif., computer-systems maker also


to a penny-a-share profit that met projections, but shares were losing 39 cents, or 6.6%, to $5.55.

Wireless-communications semiconductor



of Warren, N.J., guided under consensus for second-quarter sales, expecting only $52.1 million to $53 million. First-quarter revenue was also just shy of the average estimate. Shares were off 8% to $12.10. Disk-drive-components maker

Hutchinson Technology


tumbled 7.3% to $20.50 after swinging to a loss of 14 cents a share against the Street's 9-cent per-share income estimate.

Other late-trading falling tech stocks included



, maker of semiconductor equipment, which

widely missed estimates

and recently slid 6.9% to $40.17; wireless-communications semiconductor

RF Micro Devices


, sinking 6.3% to $6.14 on a


second-quarter outlook; and electronics maker


(SANM) - Get Free Report

, on both

poor earnings and guidance



Franklin Electric

(FELE) - Get Free Report

, Indiana-based maker of groundwater and fuel-pumping systems, dropped 8% to $41.25 on a wide first-quarter earnings miss at 24 cents a share (excluding items). Lender


(EZPW) - Get Free Report

and money-transferring outfit

Western Union

(WU) - Get Free Report

each slid on disappointing guidance. EZCorp shares were down 8.2% to $15.05; Western Union shares lost 5.2% at $21.73.