One of the best ways to profit from experts who have skin in the game is by following the public filings of corporate insiders — legal insider trading.

Roku had been among the hottest in the stock market in 2017, with the stock climbing by 120 percent. However, 2018 has been a different story with the stock falling by nearly 40 percent. The outlook may not get better in the near-term either because according to data collected by WhaleWisdom, insiders have been dumping …