{
  "page": "compare",
  "query": {
    "a": "MFSB",
    "b": "MCBKX"
  },
  "retrieved_at": "2026-07-07T18:00:41+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 Active Core Plus Bond ETF",
    "ticker": "MFSB",
    "slug": "MFSB",
    "series_id": "S000085666",
    "html_url": "https://fundwatcher.app/funds/MFSB/"
  },
  "fund_b": {
    "name": "MFS Core Bond Fund",
    "ticker": "MCBKX",
    "slug": "MCBKX",
    "series_id": "S000076470",
    "html_url": "https://fundwatcher.app/funds/MCBKX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.1451937314682760481495005880",
    "coverage_b_by_a": "0.1451937314682760481495005879",
    "shared_count": 51,
    "as_of": {
      "a": "2026-02-28",
      "b": "2026-04-30"
    },
    "a_top": [
      {
        "name": "US TREASURY N/B",
        "value": "12023389.06",
        "weight": "0.05109195",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "10441428.07",
        "weight": "0.04436959",
        "shared": true
      },
      {
        "name": "State Street Navigator Securities Lending Portfolio II",
        "value": "7478945.04",
        "weight": "0.03178088",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "5501306.63",
        "weight": "0.02337714",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "5304796.88",
        "weight": "0.02254210",
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      },
      {
        "name": "US TREASURY N/B",
        "value": "5284339.43",
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        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "3618769.53",
        "weight": "0.01537753",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "3241182.02",
        "weight": "0.01377301",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "2911235.16",
        "weight": "0.01237094",
        "shared": false
      },
      {
        "name": "FN MA5552",
        "value": "2201798.91",
        "weight": "0.00935628",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "1893988.29",
        "weight": "0.00804828",
        "shared": true
      },
      {
        "name": "Uniform Mortgage-Backed Security, TBA",
        "value": "1719661.82",
        "weight": "0.00730750",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "1527421.88",
        "weight": "0.00649060",
        "shared": false
      },
      {
        "name": "STOAU 5.75 11/13/35 144A",
        "value": "1526656.03",
        "weight": "0.00648734",
        "shared": true
      },
      {
        "name": "BOSTON PROP LP",
        "value": "1500621.74",
        "weight": "0.00637671",
        "shared": true
      },
      {
        "name": "NRZT, Series 2025-NQM6, Class A1",
        "value": "1458760.14",
        "weight": "0.00619883",
        "shared": false
      },
      {
        "name": "MF1 LLC, Series 2025-FL20, Class C",
        "value": "1409937.01",
        "weight": "0.00599136",
        "shared": false
      },
      {
        "name": "BOEING CO/THE",
        "value": "1374562.78",
        "weight": "0.00584104",
        "shared": false
      },
      {
        "name": "PMT Loan Trust, Series 2026-INV2, Class A35",
        "value": "1349850.27",
        "weight": "0.00573603",
        "shared": true
      },
      {
        "name": "HIGHWOODS REALTY",
        "value": "1347034.67",
        "weight": "0.00572406",
        "shared": false
      },
      {
        "name": "ENERGY TRANS",
        "value": "1346105.98",
        "weight": "0.00572012",
        "shared": true
      },
      {
        "name": "New Residential Mortgage Loan Trust, Series 2026-NQM3, Class A1",
        "value": "1315195.10",
        "weight": "0.00558876",
        "shared": false
      },
      {
        "name": "FR SD8199",
        "value": "1305234.90",
        "weight": "0.00554644",
        "shared": false
      },
      {
        "name": "Bain Capital Credit CLO 2021-4 Ltd",
        "value": "1300000.00",
        "weight": "0.00552419",
        "shared": false
      },
      {
        "name": "VORNADO REALTY LP SR UNSECURED 02/33 5.75",
        "value": "1296675.38",
        "weight": "0.00551007",
        "shared": false
      },
      {
        "name": "FR SD8213",
        "value": "1288747.48",
        "weight": "0.00547638",
        "shared": true
      },
      {
        "name": "NTT FINANCE",
        "value": "1279829.09",
        "weight": "0.00543848",
        "shared": true
      },
      {
        "name": "CBRE SERVICES IN",
        "value": "1270577.59",
        "weight": "0.00539917",
        "shared": false
      },
      {
        "name": "Dryden 98 CLO Ltd",
        "value": "1250000.00",
        "weight": "0.00531172",
        "shared": false
      },
      {
        "name": "C V6.875 PERP GG",
        "value": "1244738.48",
        "weight": "0.00528937",
        "shared": false
      },
      {
        "name": "Unity-Peace Park CLO Ltd",
        "value": "1243067.69",
        "weight": "0.00528227",
        "shared": false
      },
      {
        "name": "AVOLON HOLDINGS FUNDING LTD 4.95% 10/15/2032 144A",
        "value": "1207884.60",
        "weight": "0.00513276",
        "shared": false
      },
      {
        "name": "Enel SPA 7.50 10/14/2032",
        "value": "1186556.61",
        "weight": "0.00504213",
        "shared": false
      },
      {
        "name": "JEFFERIES GROUP",
        "value": "1176260.09",
        "weight": "0.00499838",
        "shared": false
      },
      {
        "name": "ROGERS COMMUNIC",
        "value": "1154365.71",
        "weight": "0.00490534",
        "shared": true
      },
      {
        "name": "JAPAN TOBACCO INC SR UNSECURED 144A 06/35 5.85",
        "value": "1137383.95",
        "weight": "0.00483318",
        "shared": false
      },
      {
        "name": "FN MA4562",
        "value": "1114860.77",
        "weight": "0.00473747",
        "shared": false
      },
      {
        "name": "DICK'S SPORTING",
        "value": "1113528.56",
        "weight": "0.00473181",
        "shared": false
      },
      {
        "name": "ELM Trust, Series 2024-ELM, Class C15",
        "value": "1105207.73",
        "weight": "0.00469645",
        "shared": false
      },
      {
        "name": "FR 5.25 01/15/31",
        "value": "1098187.05",
        "weight": "0.00466661",
        "shared": false
      },
      {
        "name": "FERGUSON ENTERPR",
        "value": "1096161.93",
        "weight": "0.00465801",
        "shared": false
      },
      {
        "name": "CHARLES SCHWAB",
        "value": "1080324.05",
        "weight": "0.00459071",
        "shared": false
      },
      {
        "name": "TARGA RESOURCES",
        "value": "1074368.99",
        "weight": "0.00456540",
        "shared": true
      },
      {
        "name": "JPMORGAN CHASE",
        "value": "1062243.64",
        "weight": "0.00451388",
        "shared": false
      },
      {
        "name": "ASHTEAD CAPITAL",
        "value": "1058262.67",
        "weight": "0.00449696",
        "shared": false
      },
      {
        "name": "BROWN & BROWN",
        "value": "1039642.26",
        "weight": "0.00441783",
        "shared": true
      },
      {
        "name": "AUTONATION INC",
        "value": "1022804.04",
        "weight": "0.00434628",
        "shared": false
      },
      {
        "name": "WELLS FARGO CO",
        "value": "1008925.02",
        "weight": "0.00428731",
        "shared": false
      },
      {
        "name": "PFP Ltd., Series 2026-13, Class AS",
        "value": "1004041.20",
        "weight": "0.00426655",
        "shared": false
      },
      {
        "name": "Dryden 86 CLO Ltd., Series 2020-86A, Class CR2",
        "value": "999927.30",
        "weight": "0.00424907",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "1625833.22",
        "weight": "0.04621059",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "1458716.21",
        "weight": "0.04146067",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "928626.56",
        "weight": "0.02639409",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "914194.92",
        "weight": "0.02598390",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "597023.44",
        "weight": "0.01696903",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "553759.77",
        "weight": "0.01573935",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "535359.38",
        "weight": "0.01521637",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "459915.62",
        "weight": "0.01307205",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "447943.36",
        "weight": "0.01273177",
        "shared": true
      },
      {
        "name": "NTT FINANCE",
        "value": "406990.85",
        "weight": "0.01156778",
        "shared": true
      },
      {
        "name": "FNCL 3.5 5/26",
        "value": "386807.95",
        "weight": "0.01099413",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "378208.99",
        "weight": "0.01074973",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "325041.33",
        "weight": "0.00923856",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "310527.34",
        "weight": "0.00882603",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "301476.56",
        "weight": "0.00856878",
        "shared": false
      },
      {
        "name": "FN MA4563",
        "value": "281860.86",
        "weight": "0.00801125",
        "shared": false
      },
      {
        "name": "BANK OF AMER CRP",
        "value": "269047.32",
        "weight": "0.00764705",
        "shared": false
      },
      {
        "name": "Bain Capital Credit CLO Ltd., Series 2022-1A, Class CR",
        "value": "250214.75",
        "weight": "0.00711178",
        "shared": true
      },
      {
        "name": "Dryden CLO Ltd., Series 2020-86A, Class BR2",
        "value": "250076.75",
        "weight": "0.00710786",
        "shared": false
      },
      {
        "name": "Dryden CLO Ltd., Series 2019-68A, Class BRR",
        "value": "250017.00",
        "weight": "0.00710616",
        "shared": false
      },
      {
        "name": "MF1 MULTIFAMILY HOUSING MORTGA MF1 2021 FL7 AS 144A",
        "value": "249806.00",
        "weight": "0.00710016",
        "shared": true
      },
      {
        "name": "Palmer Square Loan Funding 2024-3 Ltd",
        "value": "249727.25",
        "weight": "0.00709793",
        "shared": false
      },
      {
        "name": "Dryden 113 CLO Ltd., Series 2022-113A, Class AR3",
        "value": "249687.25",
        "weight": "0.00709679",
        "shared": false
      },
      {
        "name": "Shackleton 2019-XIV CLO Ltd., Series 2019-14A, Class CRR",
        "value": "248611.00",
        "weight": "0.00706620",
        "shared": false
      },
      {
        "name": "FR SD8213",
        "value": "239568.42",
        "weight": "0.00680918",
        "shared": true
      },
      {
        "name": "Uniform Mortgage-Backed Security, TBA",
        "value": "229687.32",
        "weight": "0.00652834",
        "shared": false
      },
      {
        "name": "BOSTON PROP LP",
        "value": "228047.77",
        "weight": "0.00648174",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "218355.47",
        "weight": "0.00620625",
        "shared": false
      },
      {
        "name": "Eni S.p.A.",
        "value": "212931.89",
        "weight": "0.00605210",
        "shared": true
      },
      {
        "name": "ANGLO AMERICAN CAPITAL REGD 144A P/P 5.62500000",
        "value": "206250.07",
        "weight": "0.00586219",
        "shared": false
      },
      {
        "name": "UMBS",
        "value": "206101.95",
        "weight": "0.00585798",
        "shared": false
      },
      {
        "name": "MITSUB UFJ FIN",
        "value": "204913.61",
        "weight": "0.00582420",
        "shared": false
      },
      {
        "name": "ASHTEAD CAPITAL",
        "value": "204209.42",
        "weight": "0.00580419",
        "shared": true
      },
      {
        "name": "Bain Capital Credit CLO 2020-3 Ltd",
        "value": "199997.60",
        "weight": "0.00568447",
        "shared": false
      },
      {
        "name": "FNCL 2 5/26",
        "value": "199973.38",
        "weight": "0.00568379",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "196992.19",
        "weight": "0.00559905",
        "shared": false
      },
      {
        "name": "UMBS",
        "value": "195694.85",
        "weight": "0.00556218",
        "shared": false
      },
      {
        "name": "Uniform Mortgage-Backed Security, TBA",
        "value": "187539.09",
        "weight": "0.00533037",
        "shared": false
      },
      {
        "name": "DIAGEO CAP PLC",
        "value": "186733.00",
        "weight": "0.00530746",
        "shared": false
      },
      {
        "name": "ALCON FINANCE CO",
        "value": "185130.37",
        "weight": "0.00526191",
        "shared": false
      },
      {
        "name": "TRTX Issuer Ltd., Series 2025-FL7, Class A",
        "value": "183086.19",
        "weight": "0.00520381",
        "shared": false
      },
      {
        "name": "BDS 2026-FL17 A",
        "value": "181738.00",
        "weight": "0.00516549",
        "shared": false
      },
      {
        "name": "WASTE MANAGEMENT",
        "value": "180918.69",
        "weight": "0.00514220",
        "shared": false
      },
      {
        "name": "MSWF 2023-2 A5",
        "value": "179573.59",
        "weight": "0.00510397",
        "shared": false
      },
      {
        "name": "UBS GROUP",
        "value": "176513.68",
        "weight": "0.00501700",
        "shared": false
      },
      {
        "name": "FN MA5552",
        "value": "175615.06",
        "weight": "0.00499146",
        "shared": true
      },
      {
        "name": "FN MA4823",
        "value": "174143.92",
        "weight": "0.00494964",
        "shared": false
      },
      {
        "name": "WFCM 2017-RB1 A5",
        "value": "172253.34",
        "weight": "0.00489591",
        "shared": false
      },
      {
        "name": "ACRES Commercial Realty Issuer LLC, Series 2026-FL4, Class A",
        "value": "171160.47",
        "weight": "0.00486484",
        "shared": false
      },
      {
        "name": "STELLANTIS FIN US INC REGD 144A P/P 2.69100000",
        "value": "171115.77",
        "weight": "0.00486357",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "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"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0002071691-26-015573",
      "as_of": "2026-04-30",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1330967/000207169126015573/0002071691-26-015573-index.htm"
    }
  ]
}