“The retail investor is back,” Cramer told viewers on Wednesday, and the numbers prove it. He recommended Knight Capital as a play on the trend.

Trading volume at Charles Schwab , TD Ameritrade and E*TRADE Financial jumped 14% from July to August, The Wall Street Journal reported, while Knight Capital earned a respectable 7.7% increase. And all of this took place during one of the slowest periods of the year, summer, when everyone’s on vacation. More and more people are diving in and out of small, speculative stocks, and the rest of us have a chance to game it.