Because there is no single public parent that owns the entire small-cap universe, the #1 play is direct exposure to the size factor through small-cap ETFs such as IWM (iShares Russell 2000 ETF) and IJR (iShares Core S&P Small-Cap ETF), with VB (Vanguard Small-Cap ETF) and SCHA (Schwab U.S. Small-Cap ETF) as solid alternatives. For a growth tilt, IWO (iShares Russell 2000 Growth ETF) and IWN (iShares Russell 2000 Value ETF) offer complementary exposure to the smaller, faster-expanding cohort, while SLY (SPDR S&P 600 Small Cap ETF) captures the smallest end of the spectrum. Entrepreneurially, you could build a niche research product or advisory service that identifies overlooked small-cap opportunities, leveraging data and catalysts unique to this segment.