FNDB starts with the popular Russell 3000, a representative market-cap-weighted total market index, and applies RAFI's signature fundamental screens to select and weight its stocks. The screens (5-year averages of sales, operating cash flow, and dividends plus buybacks) cut the holdings count in half. The idea is to overweight firms that generate a lot of cash through sales and return a good chunk of it to shareholders. Despite these machinations, the fund seems to mirror a market-like portfolio. The index is rebalanced on a quarterly basis. Note: FNDB's underlying index changed its name from the Russell Fundamental U.S. Index to the Russell RAFI U.S. Index on December 1, 2016. There were no changes in index methodology or exposure.