Perceptron Inc. (Nasdaq: PRCP) shares ascended 18.6% to $6.96, on volume of 771,790 shares, squashing a daily average of 16,880, after being upgraded by Barrington Research from market perform to outperform.

Nvidia Corporation (Nasdaq: NVDA) traded in 31.9 million shares Wednesday, beating out its daily average of 24 million. Prices dropped 2.4% to $23.29, after the stock gained as much as 38% during January.

Northern Dynasty Minerals Inc. (AMEX: NAK) shares plummeted 14.4% to $17.64 Wednesday. Volume of three million shares overwhelmed a full-day average of 645,000.