The Zacks Sustainable Dividend Index seeks to maximize dividend income by selecting dividend-paying stocks from the largest 1,500, by market capitalization, U.S.-listed equities as well as outperform, on a risk-adjusted basis, the S&P 1500 Dividend Index and other dividend benchmarks. The Index constituent selection methodology utilizes multi-factor proprietary selection rules to identify those stocks that offer the most attractive risk/return potential. The Index, seeking to maximize dividend sustainability at the time of each rebalance, is designed to eliminate companies that have recently paid a dividend and include those companies that are expected to pay dividends. The Index is adjusted on a monthly basis.