Following the trading of Robinhood shareholders has been all the rage lately and they haven't disappointed. I've covered the actions of these accounts recently noting how they've loaded up on bankrupt Hertz stock, oil funds and volatility futures. Their latest acquisition target is Nikola Motors (NKLA), the company that's promising a new electric vehicle battery by the end of the year, but so far has no revenue to speak of. That hasn't stopped Robinhood shareholders from buying on the potential in a big way. At the beginning of June, there were exactly zero accounts holding Nikola stock. Today, there are 140,000, making it the 53rd largest holding on the platform.