{
  "page": "compare",
  "query": {
    "a": "VISTX",
    "b": "VUSB"
  },
  "retrieved_at": "2026-07-07T19:13:22+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 SHORT-TERM BOND FUND",
    "ticker": "VISTX",
    "slug": "VISTX",
    "series_id": "S000049659",
    "html_url": "https://fundwatcher.app/funds/VISTX/"
  },
  "fund_b": {
    "name": "VANGUARD ULTRA-SHORT BOND ETF",
    "ticker": "VUSB",
    "slug": "VUSB",
    "series_id": "S000071399",
    "html_url": "https://fundwatcher.app/funds/VUSB/"
  },
  "overlap": {
    "coverage_a_by_b": "0.1854717101923904644778518566",
    "coverage_b_by_a": "0.1854717101923904644778518562",
    "shared_count": 256,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
    },
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      },
      {
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      {
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      {
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  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0000836906-26-000269",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/836906/000083690626000269/0000836906-26-000269-index.htm"
    },
    {
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      "accession_no": "0000794105-26-000181",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/794105/000079410526000181/0000794105-26-000181-index.htm"
    }
  ]
}