Large-Cap Core Dominates May ETF Flows

Investors heavily favored large-cap core equity ETF building blocks in May 2026. Simultaneously, investors bolstered portfolios with ultra-short-term fixed income allocations and targeted thematic active exposure last month  Key Takeaways Broad-market S&P 500 ETFs captured the largest share of inflows, led by Vanguard's VOO, with over $18 billion in monthly net flows.