Core Insights - The Vanguard Mega Cap Growth ETF (MGK) and the iShares Russell 2000 Growth ETF (IWO) represent different strategies in U.S. growth investing, with MGK focusing on large-cap companies and IWO on small-cap stocks [1][7] Cost & Size Comparison - MGK has a lower expense ratio of 0.07% compared to IWO's 0.24% - As of January 25, 2026, MGK's one-year return is 15.25%, while IWO's is slightly higher at 15.35% - MGK has a dividend yield of 0.35%, whereas IWO offers a yield of 0.56% - The five-year beta for MGK is 1.20, while IWO's is higher at 1.45 - MGK has assets under management (AUM) of $32 billion, significantly larger than IWO's $13 billion [3] Performance & Risk Comparison - Over the past five years, MGK experienced a maximum drawdown of -36.02%, while IWO faced a more severe drawdown of -42.02% - An investment of $1,000 in MGK would have grown to $1,954, compared to $1,097 for IWO over the same period [4][8] Portfolio Composition - IWO provides exposure to over 1,000 small-cap U.S. growth stocks, with significant allocations in healthcare (26%), technology (23%), and industrials (20%) - Major holdings in IWO include Bloom Energy, Credo Technology Group, and Kratos Defense & Security Solutions, each under 2% of the portfolio - MGK is concentrated with only 60 stocks, heavily weighted towards technology at 55%, with top holdings including Nvidia, Apple, and Microsoft, which together account for over 35% of the fund [5][6][9] Investment Implications - MGK's focus on mega-cap stocks has led to higher total returns over five years, attributed to the strong performance of its top holdings - IWO, while more volatile, offers greater diversification and less concentration in technology, appealing to investors seeking exposure to smaller, innovative companies [7][10]

For investors building wealth in tax-advantaged accounts, OEF offers a simple way to capture mega-cap performance without picking individual stocks. The low 4% turnover rate also makes it tax-efficient in taxable accounts. It's less appropriate as a sole equity holding due to sector concentration, but it pairs well with small-cap or international funds to balance exposure. When you own the 100 largest companies in America, you're betting on a simple idea: big gets bigger. The iShares S&P 100 ETF (NYSEARCA:O ...