Charles Biderman

Charles Biderman is the Founder and Chief Executive Officer of TrimTabs Investment Research and Portfolio Manager of the TrimTabs Float Shrink ETF (TTFS). After earning his MBA from Harvard Business School, he began his career as Alan Abelson’s assistant at Barron’s from 1971 to 1973. There he predicted the collapse of real estateinvestment trusts (REITs). After Barron’s, he worked in the Wall Street short selling community and recommended shorting REITs on their way to perdition.

In 1990, Mr. Biderman founded Market TrimTabs in Santa Rosa, California. He named the firm after the image of a trim tab first used by R. Buckminster Fuller to describe how change occurs. A trim tab is the small rudder on the rudder of a capital ship. Market TrimTabs originally specialized in short selling, but Mr. Biderman began tracking mutual fund flows twice each week in 1994.

In 1995, as the firm developed into the only independent research service that publishes detailed daily coverage of U.S. stock market liquidity, it became known as TrimTabs Investment Research. The premise of TrimTabs’ approach is that stock prices are a function of liquidity rather than fundamental value.

Mr. Biderman is interviewed regularly on CNBC and Bloomberg and is quoted frequently in the financial media, including Barron’s, the Wall Street Journal, Forbes, and Investor’s Business Daily. He is the author of TrimTabs Investing: Using Liquidity Theory to Beat the Stock Market (John Wiley & Sons, 2005). He holds a BA from Brooklyn College and an MBA from Harvard Business School.