SFY tracks an index of the 500 largest US equities, weighted by a proprietary combination of market cap and growth-oriented fundamental factors. The index constituents are drawn from the Solactive US Broad Market Index, a broad market-cap-weighted index of approximately 3,000 of the largest US equities. Selected constituents are initially weighted by market-cap. Weights are then modified based on a composite score calculated from three growth factors: trailing 12-month sales growth, trailing 12-month earnings per share (EPS) growth, and 12-month forward-looking EPS growth estimates. The index constituents are rebalanced and reconstituted annually.