{
  "page": "compare",
  "query": {
    "a": "VINIX",
    "b": "MIEAX"
  },
  "retrieved_at": "2026-07-07T09:51:32+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": "MM S&P 500 Index Fund",
    "ticker": "MIEAX",
    "slug": "MIEAX",
    "series_id": "S000003661",
    "html_url": "https://fundwatcher.app/funds/MIEAX/"
  },
  "overlap": {
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    "coverage_b_by_a": "0.9672947654197660019803589347",
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    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
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      {
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        "name": "ALPHABET INC CL C",
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      {
        "name": "META PLATFORMS INC CL A",
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      {
        "name": "TESLA INC",
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      },
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        "name": "BERKSHIRE HATH-B",
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      {
        "name": "LILLY ELI and CO",
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        "name": "INTL BUS MACH CORP",
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      {
        "name": "NEXTERA ENERGY INC",
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      {
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      {
        "name": "INTEL CORP",
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      {
        "name": "AT&T INC",
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      },
      {
        "name": "MORGAN STANLEY",
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      },
      {
        "name": "CITIGROUP INC",
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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": "0001410368-26-053571",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/916053/000141036826053571/0001410368-26-053571-index.htm"
    }
  ]
}