Insider Sell-To-Buy Ratio

As Nejat Seyhun, Professor of Finance at the University of Michigan, demonstrated in his book, Investment Intelligence From Insider Trading, the aggregate selling-to-buying ratio over certain periods of time has a very good track record at predicting future returns in the stock market. In his words, “Aggregate insider trading predicts aggregate stock returns.” Furthermore, “Aggregate insider trading predicts changes in future economic growth up to two years ahead.”