AUTHORITATIVE portfolio holdings of a US ETF or mutual fund (SEC Form N-PORT) — what the fund actually owns. Pass the FUND's ticker (e.g. "ARKK", "QQQ", "VTI", "VOO", "IVV"). Returns the latest monthly portfolio: net assets, holdings count, and top positions by weight — each with name, CUSIP, value (USD), and % of fund. Use for "what does ARKK hold", "top holdings of QQQ", "is $STOCK in VTI". Distinct from edgar_institutional_holdings (13F = what an investment MANAGER like Berkshire owns); this is a registered fund's own N-PORT. Covers US-registered open-end funds + ETFs; data is ~30-60 days delayed. Note: a few legacy ETFs structured as unit investment trusts (e.g. SPY, DIA) don't file N-PORT and won't resolve — use IVV or VOO for S&P 500 exposure.
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