Stocks rebounded in somewhat lopsided fashion Wednesday, but market leaders in general showed the muscle typically witnessed in a healthy uptrend. The IBD 50 rose 0.4%. The Nasdaq composite led the field, rising nearly 0.8% and staging a solid bounce from mild weakness at the open. Gains in key growth sectors including security software, biotech and computer networking benefited the tech-heavy index. The S&P 500 lagged with a 0.4% gain.