Vanguard Morningstar Mega Cap Growth ETF (MGK US) – Portfolio Construction Methodology
Aug 7th, 2026 | By ETF Strategy AnalyticsThe underlying Morningstar US Mega Cap Growth Index delivers U.S. mega-cap growth exposure by overlaying Morningstar’s style model on its market-cap taxonomy. The mega-cap size segment is the largest 70% of cumulative U.S. market cap from the Morningstar US Total Market Index, with migration “packeting” using a 64%–76% band around the 70% breakpoint to reduce turnover (50% packets shift across bands per consecutive-quarter rules). Growth versus value is determined via an 11-factor model: growth uses six inputs (forward long- and short-term EPS growth, 3-year EPS and sales growth, investment-to-assets, ROA) and value uses five (book-to-price, forward and historical earnings-to-price, dividend-to-price, sales-to-price). Securities receive proportional style allocations when scores lie in the overlap band; weights equal float-adjusted market cap × style allocation. The index is reviewed and reconstituted quarterly, with corporate actions processed promptly and IPOs assigned at the next ranking when sufficient factor data exist.