{
  "page": "compare",
  "query": {
    "a": "FSTZX",
    "b": "TDTT"
  },
  "retrieved_at": "2026-07-07T14:17:35+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": "Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund",
    "ticker": "FSTZX",
    "slug": "FSTZX",
    "series_id": "S000072688",
    "html_url": "https://fundwatcher.app/funds/FSTZX/"
  },
  "fund_b": {
    "name": "FlexShares iBoxx 3-Year Target Duration TIPS Index Fund",
    "ticker": "TDTT",
    "slug": "TDTT",
    "series_id": "S000033316",
    "html_url": "https://fundwatcher.app/funds/TDTT/"
  },
  "overlap": {
    "coverage_a_by_b": "0.6650464968060873968000291699",
    "coverage_b_by_a": "0.6650464968060873968000291701",
    "shared_count": 22,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-01-31"
    },
    "a_top": [
      {
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        "value": "530029227.12",
        "weight": "0.05464856",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Linked Notes",
        "value": "512805042.52",
        "weight": "0.05287267",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Protected Indexed Notes",
        "value": "493243271.69",
        "weight": "0.05085575",
        "shared": true
      },
      {
        "name": "U.S. Treasury Notes",
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        "weight": "0.05062157",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.250 04/15/2028",
        "value": "485479171.55",
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        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 2.375% 10/15/2028",
        "value": "479180468.53",
        "weight": "0.04940581",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .125 07/15/2030",
        "value": "472850048.87",
        "weight": "0.04875311",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031",
        "value": "455518087.53",
        "weight": "0.04696611",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 04/15/2027",
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      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1-5/8% 10/15/27",
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        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 10/15/2026",
        "value": "430348237.98",
        "weight": "0.04437097",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/2% 01/15/2028",
        "value": "423520378.69",
        "weight": "0.04366699",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/8% 07/15/2027",
        "value": "422963909.83",
        "weight": "0.04360961",
        "shared": true
      },
      {
        "name": "U.S. Treasury Notes 0.125%, Due 1/15/2030",
        "value": "408802239.76",
        "weight": "0.04214948",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .25%  07/15/29",
        "value": "368347990.33",
        "weight": "0.03797845",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 07/15/2028",
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      },
      {
        "name": "U.S. Treasury Inflation-Protected Security 0.375%, due 01/15/27",
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      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8%  07/15/2026",
        "value": "323637800.16",
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .875% 01/15/2029",
        "value": "314978217.37",
        "weight": "0.03247577",
        "shared": true
      },
      {
        "name": "U.S. Treasury Notes",
        "value": "287054110.59",
        "weight": "0.02959666",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-7/8% 04/15/29",
        "value": "258517173.25",
        "weight": "0.02665436",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 2-3/8% 01/15/27",
        "value": "238183971.19",
        "weight": "0.02455791",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-5/8% 04/15/28",
        "value": "193518811.18",
        "weight": "0.01995272",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1-3/4% 01/15/28",
        "value": "186957960.44",
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        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 2-1/2% 01/15/29",
        "value": "170846876.65",
        "weight": "0.01761513",
        "shared": true
      },
      {
        "name": "Fidelity Cash Central Fund",
        "value": "159270330.94",
        "weight": "0.01642154",
        "shared": false
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    ],
    "b_top": [
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .875% 01/15/2029",
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        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 2.375% 10/15/2028",
        "value": "307434008.09",
        "weight": "0.12280002",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-7/8% 04/15/29",
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        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 2-1/2% 01/15/29",
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        "shared": true
      },
      {
        "name": "U.S. Treasury Notes",
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        "weight": "0.03808957",
        "shared": true
      },
      {
        "name": "U.S. Treasury Notes",
        "value": "90983355.24",
        "weight": "0.03634197",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 07/15/2031",
        "value": "88814714.86",
        "weight": "0.03547574",
        "shared": false
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .125 07/15/2030",
        "value": "87107605.65",
        "weight": "0.03479386",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Protected Security 0.375%, due 01/15/27",
        "value": "85516074.46",
        "weight": "0.03415815",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/2% 01/15/2028",
        "value": "85352279.41",
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        "shared": true
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031",
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      },
      {
        "name": "U.S. Treasury Notes 0.125%, Due 1/15/2030",
        "value": "83860273.37",
        "weight": "0.03349676",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES .25%  07/15/29",
        "value": "83102812.21",
        "weight": "0.03319420",
        "shared": true
      },
      {
        "name": "U.S. Treasury Inflation-Protected Indexed Notes",
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        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/8% 07/15/2027",
        "value": "82325000.13",
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        "shared": true
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-3/4% 07/15/2028",
        "value": "79591637.27",
        "weight": "0.03179172",
        "shared": true
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 04/15/2027",
        "value": "75725587.36",
        "weight": "0.03024748",
        "shared": true
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1-5/8% 10/15/27",
        "value": "75243394.21",
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1.250 04/15/2028",
        "value": "73416121.99",
        "weight": "0.02932500",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-5/8% 04/15/28",
        "value": "59938073.33",
        "weight": "0.02394139",
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      },
      {
        "name": "U.S. Treasury Inflation-Linked Notes",
        "value": "47137141.66",
        "weight": "0.01882824",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 2-3/8% 01/15/27",
        "value": "45187970.85",
        "weight": "0.01804967",
        "shared": true
      },
      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 1-3/4% 01/15/28",
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 3-3/8% 04/15/32",
        "value": "17201033.40",
        "weight": "0.00687070",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0000035402-26-003404",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/35315/000003540226003404/0000035402-26-003404-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0002071691-26-006217",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1491978/000207169126006217/0002071691-26-006217-index.htm"
    }
  ]
}