{
  "page": "compare",
  "query": {
    "a": "MIAAX",
    "b": "TDTF"
  },
  "retrieved_at": "2026-07-07T16:55:16+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 Inflation-Adjusted Bond Fund",
    "ticker": "MIAAX",
    "slug": "MIAAX",
    "series_id": "S000002493",
    "html_url": "https://fundwatcher.app/funds/MIAAX/"
  },
  "fund_b": {
    "name": "FlexShares iBoxx 5-Year Target Duration TIPS Index Fund",
    "ticker": "TDTF",
    "slug": "TDTF",
    "series_id": "S000034352",
    "html_url": "https://fundwatcher.app/funds/TDTF/"
  },
  "overlap": {
    "coverage_a_by_b": "0.5121496703887186419515368522",
    "coverage_b_by_a": "0.5121496703887186419515368522",
    "shared_count": 12,
    "as_of": {
      "a": "2026-01-31",
      "b": "2026-01-31"
    },
    "a_top": [
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031",
        "value": "178936744.13",
        "weight": "0.11643465",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .125 07/15/2030",
        "value": "142317686.66",
        "weight": "0.09260652",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Protected Notes 1.75%, Due 01/15/2034",
        "value": "116075239.71",
        "weight": "0.07553049",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .875% 01/15/2029",
        "value": "114627940.53",
        "weight": "0.07458873",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8%  01/15/32",
        "value": "96938831.39",
        "weight": "0.06307837",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/8% 07/15/2027",
        "value": "89863398.63",
        "weight": "0.05847437",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2042",
        "value": "82847431.12",
        "weight": "0.05390906",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.125% 01/15/2033",
        "value": "74674109.87",
        "weight": "0.04859066",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-5/8% 04/15/28",
        "value": "71902790.70",
        "weight": "0.04678735",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.375 07/15/33",
        "value": "68852387.94",
        "weight": "0.04480244",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Linked Notes",
        "value": "61829872.38",
        "weight": "0.04023287",
        "shared": true
      },
      {
        "name": "U.S. Treasury Notes",
        "value": "58566397.02",
        "weight": "0.03810932",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/2% 01/15/2028",
        "value": "57430372.56",
        "weight": "0.03737011",
        "shared": false
      },
      {
        "name": "U.S. Treasury Inflation-Protected Indexed Notes",
        "value": "40800861.05",
        "weight": "0.02654924",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 02/15/2045",
        "value": "39888927.96",
        "weight": "0.02595584",
        "shared": false
      },
      {
        "name": "U.S. Treasury Inflation-Protected Notes 2.125%, Due 02/15/2054",
        "value": "31433186.25",
        "weight": "0.02045366",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 02/15/2043",
        "value": "27809725.35",
        "weight": "0.01809587",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8%  02/15/2052",
        "value": "22231364.04",
        "weight": "0.01446601",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1% 02/15/48",
        "value": "18559114.47",
        "weight": "0.01207647",
        "shared": false
      },
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "15160295.51",
        "weight": "0.00986485",
        "shared": false
      },
      {
        "name": "U.S. Treasury Notes 0.125%, Due 1/15/2030",
        "value": "11773578.74",
        "weight": "0.00766110",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 07/15/2032",
        "value": "11101648.70",
        "weight": "0.00722387",
        "shared": true
      },
      {
        "name": "Government National Mortgage Association",
        "value": "6950135.66",
        "weight": "0.00452247",
        "shared": false
      },
      {
        "name": "Palmer Square Loan Funding Ltd., Series 2025-2A, Class A2",
        "value": "5703283.20",
        "weight": "0.00371114",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 07/15/2028",
        "value": "5154752.44",
        "weight": "0.00335421",
        "shared": false
      },
      {
        "name": "Palmer Square Loan Funding Ltd., Series 2025-1A, Class A2",
        "value": "4300060.20",
        "weight": "0.00279806",
        "shared": false
      },
      {
        "name": "Fannie Mae REMICS",
        "value": "4068563.55",
        "weight": "0.00264743",
        "shared": false
      },
      {
        "name": "SHACKLETON CLO LTD SHACK 2019 14A BRR 144A",
        "value": "3997610.41",
        "weight": "0.00260126",
        "shared": false
      },
      {
        "name": "Freddie Mac REMICS",
        "value": "3873927.48",
        "weight": "0.00252078",
        "shared": false
      },
      {
        "name": "Government National Mortgage Association",
        "value": "3826310.44",
        "weight": "0.00248979",
        "shared": false
      },
      {
        "name": "PFS Financing Corp., Series 2025-A, Class A",
        "value": "3480303.64",
        "weight": "0.00226464",
        "shared": false
      },
      {
        "name": "Barings CLO Ltd., Series 2021-3A, Class B1R",
        "value": "3005931.00",
        "weight": "0.00195597",
        "shared": false
      },
      {
        "name": "Government National Mortgage Association",
        "value": "2845720.04",
        "weight": "0.00185172",
        "shared": false
      },
      {
        "name": "Freddie Mac REMICS",
        "value": "2667250.75",
        "weight": "0.00173559",
        "shared": false
      },
      {
        "name": "Toledo Hospital/The",
        "value": "2478516.25",
        "weight": "0.00161278",
        "shared": false
      },
      {
        "name": "AREIT Trust, Series 2022-CRE6, Class AS",
        "value": "2453256.91",
        "weight": "0.00159634",
        "shared": false
      },
      {
        "name": "Government National Mortgage Association",
        "value": "2405828.03",
        "weight": "0.00156548",
        "shared": false
      },
      {
        "name": "GreatAmerica Leasing Receivables Funding LLC, Series 2025-1, Class A2",
        "value": "2317538.67",
        "weight": "0.00150803",
        "shared": false
      },
      {
        "name": "FNMA, Series 2023-54, Class FD",
        "value": "1734812.38",
        "weight": "0.00112885",
        "shared": false
      },
      {
        "name": "Government National Mortgage Association",
        "value": "1702021.51",
        "weight": "0.00110751",
        "shared": false
      },
      {
        "name": "PMTLT 2025-INV10 A36",
        "value": "1664848.19",
        "weight": "0.00108332",
        "shared": false
      },
      {
        "name": "Government National Mortgage Association",
        "value": "1482485.68",
        "weight": "0.00096466",
        "shared": false
      },
      {
        "name": "PMTLT 2026-CNF1 A26",
        "value": "1438327.60",
        "weight": "0.00093592",
        "shared": false
      },
      {
        "name": "CONSFD 3.474 12/15/29 2019",
        "value": "1379411.71",
        "weight": "0.00089759",
        "shared": false
      },
      {
        "name": "Freddie Mac Multifamily Structured Pass Through Certificates",
        "value": "1359530.72",
        "weight": "0.00088465",
        "shared": false
      },
      {
        "name": "ARI Fleet Lease Trust, Series 2025-A, Class A2",
        "value": "1331895.05",
        "weight": "0.00086667",
        "shared": false
      },
      {
        "name": "Government National Mortgage Association",
        "value": "1304533.45",
        "weight": "0.00084886",
        "shared": false
      },
      {
        "name": "MSRM 2025-NQM3 VAR 05/25/2070 144A",
        "value": "1284913.85",
        "weight": "0.00083610",
        "shared": false
      },
      {
        "name": "J.P. Morgan Mortgage Trust, Series 2026-NQM1, Class A1",
        "value": "1265339.31",
        "weight": "0.00082336",
        "shared": false
      },
      {
        "name": "Freddie Mac Multifamily Structured Pass Through Certificates",
        "value": "1262826.88",
        "weight": "0.00082173",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "U.S. Treasury Inflation-Linked Notes",
        "value": "89382937.65",
        "weight": "0.09249568",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 07/15/2031",
        "value": "87056512.70",
        "weight": "0.09008824",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .125 07/15/2030",
        "value": "85394974.99",
        "weight": "0.08836884",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031",
        "value": "83645844.61",
        "weight": "0.08655880",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Protected Indexed Notes",
        "value": "49790569.00",
        "weight": "0.05152452",
        "shared": false
      },
      {
        "name": "U.S. Treasury Inflation-Protected Indexed Notes",
        "value": "46674602.82",
        "weight": "0.04830004",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8%  01/15/32",
        "value": "44649803.97",
        "weight": "0.04620473",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Protected Notes 1.75%, Due 01/15/2034",
        "value": "44199623.88",
        "weight": "0.04573887",
        "shared": true
      },
      {
        "name": "U.S. Treasury Notes",
        "value": "44171393.23",
        "weight": "0.04570965",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.125% 01/15/2033",
        "value": "42917422.53",
        "weight": "0.04441201",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-5/8% 07/15/2032",
        "value": "41467845.39",
        "weight": "0.04291196",
        "shared": true
      },
      {
        "name": "U.S. Treasury Notes 0.125%, Due 1/15/2030",
        "value": "40715391.96",
        "weight": "0.04213330",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.375 07/15/33",
        "value": "40416614.47",
        "weight": "0.04182412",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .25%  07/15/29",
        "value": "40332120.36",
        "weight": "0.04173668",
        "shared": false
      },
      {
        "name": "U.S. Treasury Inflation-Protected Indexed Notes",
        "value": "40066977.90",
        "weight": "0.04146230",
        "shared": false
      },
      {
        "name": "U.S. Treasury Notes",
        "value": "38436145.50",
        "weight": "0.03977468",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .875% 01/15/2029",
        "value": "37944487.87",
        "weight": "0.03926590",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-7/8% 04/15/29",
        "value": "34029696.00",
        "weight": "0.03521477",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 2-1/2% 01/15/29",
        "value": "18214776.18",
        "weight": "0.01884910",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-3/8% 04/15/32",
        "value": "16839376.90",
        "weight": "0.01742581",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0001410368-26-032759",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/63075/000141036826032759/0001410368-26-032759-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0002071691-26-006210",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1491978/000207169126006210/0002071691-26-006210-index.htm"
    }
  ]
}