Hanger Orthopedic Group (NYSE: HGR) shares rocketed 20.5% to $27.43 Thursday, on volume of just more than a million shares, already five times its daily average, after announcing a 10% surge in sales, though profits were down.

Sprint Nextel Corporation (NYSE: S) traded in 100.5 million shares Thursday, more than twice its daily average. Prices sprang up 3.9% to $4.52, amid higher subscription rates.

Pacer International Inc. (Nasdaq: PACR) shares plummeted 20.8% to $5.46. Volumes of two million shares quadrupled its daily average, after reporting Wednesday a surprise quarterly loss of $1.1 million, compared to a $9.3-million gain in the prior-year quarter.