After-hours action was mixed Thursday as investors sifted through another large pile of earnings reports.

Among the top postbell gainers was

Crocs

(CROX) - Get Crocs, Inc. Report

, which surged nearly 14% to $65.32 after first-quarter per-share income and revenue each

more than tripled

from last year, squashing Wall Street estimates. The Niwot, Colo., plastic-shoe maker also announced a two-for-one stock split.

Seattle coffee giant

Starbucks

(SBUX) - Get Starbucks Corporation Report

said fiscal second-quarter income gained 3 cents per share on last year to 19 cents, which

squares with analysts' expectations

, per Thomson Financial. Shares lately rose 0.9% to $31.90 in heavy trading.

Among tech names on the rise after the bell was Clifton Park, N.Y.-based

On2 Technologies

( ONT), which makes video compression/decompression software. First-quarter revenue more than doubled year over year to $2.8 million, ahead of two analysts' estimates. Shares jumped 16.1% to $2.45.

Arizona's

First Solar

(FSLR) - Get First Solar, Inc. Report

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, a solar-energy semiconductor, jumped 7.3% to $62.15 after swinging to a 7-cent per-share profit from last year and nearly quintupling its revenue to $66.9 million.

Sigmatel

( SGTL), another semiconductor, posted a

sharply narrowed loss

of 41 cents a share (excluding items), handily beating Wall Street's 48-cent forecast. The Austin, Texas-based company added 4.2% to $4.

Meanwhile,

NovaStar Financial

( NFI) shares lifted by 7.3% to $6.89 after the struggling subprime lender secured a $1.9 billion financing facility from Wachovia.

On the flip side, after-hours losers included the actively traded

Jones Soda

(JSDA)

. The Seattle-based maker of natural soda plunged 16.3% to $21.10 after posting a small break-even profit in the first quarter, which

missed

the average 3-cent per-share target. Revenue, at $9.2 million, also fell far short of the $13.2 million consensus.

21st Century Holding

(TCHC)

, a small Florida-based insurer, gave up 43.8% to $11.25 after first-quarter profits dropped steeply from last year to a dime a share, vs. 83 cents last year.

Silicon Image

(SIMG)

, of Sunnyvale, Calif., also reported a plummeting bottom line. First-quarter non-GAAP profits totaled $6.3 million, or 7 cents a share, compared with 13 cents last year. Shares of the semiconductor firm lost 4.5% to $8.55 in recent extended trading.