Goldman Sachs purchased a minority stake in TrimTabs Investment Research, a company that provides data on equities and cash available for investment. Terms were not disclosed. TrimTabs will use the capital to expand its global offerings to cover exchanges in Germany, Japan and China, among other countries, said Charles Biderman, TrimTabs chairman. Mr. Biderman said the firm also intends to start tracking liquidity characteristics such as stock buybacks and free cash flow for all companies with a market capitalization greater than $1 billion. Goldman purchased the minority stake in TrimTabs through its Hudson Street Services business, which provides investment research, tools and services to institutional investors.