{
  "data_version": "seed-0.7 · marketcap-1 · 2026-08-30",
  "source": "https://finance.foundation",
  "license": {
    "finance_foundation_data": "CC BY 4.0 — attribution: Finance Foundation (https://finance.foundation)",
    "upstream_values": "Fields sourced from a provider carry their own source field and remain under that provider's terms — see https://finance.foundation/api/v1/sources"
  },
  "entity": "fund",
  "data": {
    "id": "vanguard-sp500",
    "lei": "12WZ1W76P8QD4VJ6OB47",
    "name": "Vanguard S&P 500 ETF",
    "symbol": "VOO",
    "type": "ETF",
    "manager": "Vanguard",
    "manager_company": null,
    "strategy": "S&P 500 index tracking",
    "country": "united-states",
    "aum_usd_bn": 1421.3,
    "description": "Low-cost ETF tracking the S&P 500 index; overtook SPY in 2025 to become the largest ETF share class by assets. The size shown here is the whole fund across all four of its classes, which is a larger number measuring a different thing. Known for an ultra-low expense ratio.",
    "listed": true,
    "structure": {
      "listed": true,
      "ticker": "VOO",
      "listing": {
        "market": "nyse",
        "segment_mic": "ARCX",
        "venue_name": "NYSE Arca",
        "ticker": "VOO",
        "currency": "USD"
      },
      "sec": {
        "cik": 36405,
        "series_id": "S000002839",
        "series_name": "Vanguard 500 Index Fund",
        "class_id": "C000092055",
        "entity_name": "VANGUARD INDEX FUNDS"
      },
      "classes": [
        {
          "ticker": "VFFSX",
          "class_id": "C000170274",
          "name": "Institutional Select Shares"
        },
        {
          "ticker": "VFIAX",
          "class_id": "C000007774",
          "name": "Admiral Shares"
        },
        {
          "ticker": "VFINX",
          "class_id": "C000007773",
          "name": "Investor Shares"
        },
        {
          "ticker": "VOO",
          "class_id": "C000092055",
          "name": "ETF Shares"
        }
      ],
      "tracks": "sp500",
      "tracks_note": null,
      "route": "SEC series/class",
      "note": "A fund is not the same thing as a ticker. Where `classes` holds more than one entry they are share classes of ONE portfolio — same holdings, same manager, different terms — and in Vanguard's case the ETF is itself a class of the mutual fund. Series and class identifiers come from the SEC's Investment Company Series and Class report. `listed: false` means the entry is an institutional pool with no units to buy, which is why it has no ticker.",
      "market_link": "https://finance.foundation/api/v1/markets/nyse",
      "tracks_link": "https://finance.foundation/api/v1/assets/sp500"
    },
    "aum_seed_usd_bn": 750,
    "size": {
      "usd": 1421263311402,
      "basis": "net assets of the whole series, all share classes",
      "as_of": "2026-03-31",
      "form": "NPORT-P",
      "filed": "2026-05-28",
      "source": "SEC N-PORT data set",
      "series_lei": "12WZ1W76P8QD4VJ6OB47",
      "series_name": "VANGUARD 500 INDEX FUND",
      "url": "https://www.sec.gov/data-research/sec-markets-data/form-n-port-data-sets",
      "note": "`basis` says what is counted, because how big a fund is has more than one honest answer: a filing reports the whole series while a quote screen shows one share class. `aum_seed_usd_bn` on the entity is the earlier undated figure, kept so the two can be compared."
    }
  },
  "field_provenance": {
    "aum_usd_bn": "Finance Foundation seed reference value compiled from the manager's published disclosures, approximate, Q2 2026 — AUM moves daily."
  },
  "links": {
    "html": "https://finance.foundation/funds/vanguard-sp500",
    "graph": "https://finance.foundation/api/v1/graph/funds/vanguard-sp500",
    "sources": "https://finance.foundation/api/v1/sources"
  }
}