The investment seeks to track the investment results of the S&P SmallCap 600 Sustainability Screened Index composed of small-capitalization U.S. equities while applying screens for company involvement in controversies and controversial business activities. The fund seeks to track the investment results of the underlying index, which measures the performance of the small-capitalization sector of the U.S. equity market while excluding companies involved in controversial business activities and controversies, as determined by S&P Dow Jones Indices LLC. BFA uses a representative sampling indexing strategy to manage the fund. It is non-diversified.