Stocks were mixed after the close Wednesday, with many of the top performers -- such as actively traded Symantec ( SYMC - Get Report) -- coming from the tech sector.

The Cupertino, Calif., security-software developer posted fiscal fourth-quarter profits, excluding items, of $226.8 million, or 24 cents a share, on $1.36 billion in revenue. Analysts polled by Thomson Financial were looking for 20 cents a share on $1.27 billion sales. The firm also guided well above fiscal 2008 revenue targets and foresees full-year income leaning to the higher end of the consensus. Shares were adding 5.8% to $19.23 in recent after-hours trading.

NVE ( NVEC - Get Report), a Minnesotan semiconductor firm, shot up 13% to $33.49 after fiscal fourth-quarter earnings, at 33 cents a share, topped the average Street target by 6 cents. Colorado's Sirenza Microdevices ( SMDI, another semiconductor, jumped 10.5% to $10.12 after posting rising pro forma profits of 12 cents a share, which outpaces the Street's dime-a-share projections.

Seattle-based Internet-software maker RealNetworks ( RNWK - Get Report) was among the tech winners, lately gaining 6.1% to $8.08 on a nickel EPS beat, and Genesis Microchip ( GNSS, of Alviso, Calif., lost a penny less than expected. Shares tacked on 3.7% to $9.

Also on the rise late Wednesday was Minrad International ( BUF, a drugmaker based in Orchard Park, N.Y., that announced the Food and Drug Administration had approved for commercialization its Sojourn Sevoflurane inhalation anesthetic. Shares bounced 93 cents, or 16.7%, to $6.49.

Postbell decliners emerged from a mixed bag of industries, with the tech sector once again playing a part as JDSU ( JDSU, a communications-equipment maker, lost 9.5% to $15.06. The Milpitas, Calif., company missed income estimates for the fiscal third quarter and guided below sales targets for the next.

Farm-products purveyor Andersons ( ANDE, of Maumee, Ohio, fell 10.2% to $41.50 on poor 2007 guidance. PeopleSupport ( PSPT, an outsourcing firm based in Los Angeles, retreated after it said that lost revenue from a beleaguered client, Vonage, will pressure next-quarter and full-year results far below analysts' expectations. Shares were sliding 87 cents, or 7%, to $11.53.

Among other names sliding on disappointing results after hours, restaurant chain Applebee's ( APPB sank 3.2% to $26.58 on lower first-quarter profits, sliding same-store sales and a revenue miss.

Monogram Biosciences ( MGRM shed 4.9% to $1.76 on a bigger-than-expected loss, and Las Vegas Sands ( LVS saw waning first-quarter profits to 26 cents a share. The casino operator was off $2.84, or 3.2%, to $85.70, in recent late trading.