BIZD tracks a concentrated index of US publicly-listed private equity investment companies: The ETF buys shares of firms that in turn invest in the debt and equity of mid-sized private firms. The index selects the largest and most liquid companies which are treated as Business Development Companies (BDC) and weights them by market-cap, with a cap of 20% per issuer, to ensure diversification. Small- and midcaps are also eligible for inclusion in the index. The fund uses a sampling strategy, meaning the fund may not hold all the stocks of the underlying index but will hold securities that collectively have the same investment profile. The index is rebalanced quarterly.