Stocks were mostly pulling back from Tuesday's regular-session highs after the closing bell, but among the biggest price gainers was 3SBio ( SSRX).

Shares of the China-based biotech company leapt 17.4% after third-quarter earnings totaled a better-than-expected 15 cents per American Depositary Share. The company posted revenue of $7.5 million. Analysts polled by Thomson Financial were seeking 12 cents per ADS on revenue of $6.5 million. Shares were up $2.50 to $16.90.

Also after the bell, fast-food chain Wendy's ( WEN - Get Report) saw mixed trading following a buyout bid. In a regulatory filing, Nelson Peltz's Triarc Cos. ( TRY), operator of the Arby's restaurant chain, disclosed making an unspecified cash and stock offer that's below the previously mulled range of $37 to $41 a share. Shares were adding 32 cents to $31.97.

Solidly on the downside, however, was Excel Maritime Carriers ( EXM), a Greek seaborne shipper that sank 15% after third-quarter income missed analysts' estimates despite leaping from a year ago. Revenue, moreover, came to a below-par $43.2 million. Shares were losing $7.89 to $44.70, erasing nearly all of the huge run-up gains it booked in the regular session.

And medical-device maker Northstar Neuroscience ( NSTR) fell on a delay in the planned submission of its proposed stroke motor-recovery drug, Everest, for regulatory approval. Following "recent communications" with the Food and Drug Administration on required data, Northstar won't submit a pre-market approval application till early in the second quarter of 2008. Previously, it had planned to do this by year-end 2007. Shares of the Seattle-based company slid 13.3% to $9.93.