Investopedia says...To identify trends, MPT analysts employ the Brooks ratio, which divides total insider sales of a company by total insider trades (purchases and sales) and then averages this ratio for 2,500 stocks. If the average Brooks ratio is less than 40%, the market outlook is bullish; above 60% signals a bearish outlook Read more: When Insiders Buy, Should Investors Join Them? https://www.investopedia.com/articles/02/121002.asp#ixzz54kTvfRwr Follow us: Investopedia on Facebook