TrimTabs Investment Research, now part of Informa @IFI_Financial, is an institutional research firm focused on equity market liquidity. The firm was founded by Charles Biderman in 1990. The key premise of our approach is that stock prices are a function of liquidity—the amount of shares available to buy and the amount of money available to buy them—rather than fundamental value. Like the prices of any tradable good, the prices of stocks are driven by supply and demand. For more information about TrimTabs, please visit www.trimtabs.com or follow TrimTabs on Twitter @trimtabsir.