{
  "page": "compare",
  "query": {
    "a": "VINIX",
    "b": "S000000043"
  },
  "retrieved_at": "2026-07-07T09:45:50+00:00",
  "disclaimer": "Informational only — not investment advice. FundWatcher presents publicly available data and makes no recommendation to buy or sell any security. Verify all figures against the source filing before relying on them.",
  "attribution": "Data sourced from U.S. SEC EDGAR filings (Forms N-PORT, N-CEN, and prospectus Risk/Return summaries). FundWatcher is not affiliated with the SEC.",
  "terms": {
    "notice": "Use of this data is subject to the FundWatcher Terms of Service. Information may be used only for personal, non-commercial research and may not be redistributed.",
    "url": "https://fundwatcher.app/terms/"
  },
  "fund_a": {
    "name": "VANGUARD INSTITUTIONAL INDEX FUND",
    "ticker": "VINIX",
    "slug": "VINIX",
    "series_id": "S000002853",
    "html_url": "https://fundwatcher.app/funds/VINIX/"
  },
  "fund_b": {
    "name": "Index 500 Stock Portfolio",
    "ticker": "",
    "slug": "S000000043",
    "series_id": "S000000043",
    "html_url": "https://fundwatcher.app/funds/S000000043/"
  },
  "overlap": {
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    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0000862084-26-000094",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/862084/000086208426000094/0000862084-26-000094-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001410368-26-053263",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/742212/000141036826053263/0001410368-26-053263-index.htm"
    }
  ]
}