{
  "page": "compare",
  "query": {
    "a": "MFBFX",
    "b": "MFSB"
  },
  "retrieved_at": "2026-07-07T18:02:05+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": "MFS Corporate Bond Fund",
    "ticker": "MFBFX",
    "slug": "MFBFX",
    "series_id": "S000002492",
    "html_url": "https://fundwatcher.app/funds/MFBFX/"
  },
  "fund_b": {
    "name": "MFS Active Core Plus Bond ETF",
    "ticker": "MFSB",
    "slug": "MFSB",
    "series_id": "S000085666",
    "html_url": "https://fundwatcher.app/funds/MFSB/"
  },
  "overlap": {
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    "coverage_b_by_a": "0.09601876659680514112161225417",
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    "as_of": {
      "a": "2026-04-30",
      "b": "2026-02-28"
    },
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      {
        "name": "ELM Trust, Series 2024-ELM, Class C15",
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        "name": "WELLS FARGO CO",
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      {
        "name": "PFP Ltd., Series 2026-13, Class AS",
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        "name": "Dryden 86 CLO Ltd., Series 2020-86A, Class CR2",
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    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0002071691-26-015565",
      "as_of": "2026-04-30",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/63075/000207169126015565/0002071691-26-015565-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001410368-26-040065",
      "as_of": "2026-02-28",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/2018846/000141036826040065/0001410368-26-040065-index.htm"
    }
  ]
}