RZG, by contrast, is built around the S&P SmallCap 600 Pure Growth Index , with a sharper focus on healthcare (26%), followed by industrials (18%) and financial services (16%). Its top holdings — ACM Research Inc. (NASDAQ:ACMR), PTC Therapeutics Inc. (NASDAQ:PTCT), and Progyny Inc. (NASDAQ:PGNY) — each represents a slightly larger slice of the portfolio than VBK’s top names. With 131 stocks, RZG is less diversified and may be more sensitive to swings in its favored sectors.VBK tracks a broad index of U.S. s ...