PDF Solutions Inc. (Nasdaq: PDFS) shares gained 18.3% to $5.68 Wednesday. Volume of 268,590 proved nearly triple its full-day average. San Jose-based PDFS is the leading provider of yield improvement technologies and services for the integrated circuit (IC) manufacturing process life cycle.

Ford Motor Company (NYSE: F) traded in 37,503,600 shares Wednesday, approaching its daily average of 82,793,000. Prices for F nudged ahead 1.3 percent to $18.51.

Stealth Gas Inc, (Nasdaq: GASS) fell 6.6 percent Wednesday to $7.59 Volume for the stock was 145,497 shares, better than 2 1/2 its daily average. Greek-based GASS, a ship-owning company, primarily serves the liquified petroleum gas sector of the international shipping industry.