{
  "page": "compare",
  "query": {
    "a": "TBIAX",
    "b": "LUTAX"
  },
  "retrieved_at": "2026-07-07T16:19:41+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": "Nuveen Bond Index Fund",
    "ticker": "TBIAX",
    "slug": "TBIAX",
    "series_id": "S000026500",
    "html_url": "https://fundwatcher.app/funds/TBIAX/"
  },
  "fund_b": {
    "name": "Columbia U.S. Treasury Index Fund",
    "ticker": "LUTAX",
    "slug": "LUTAX",
    "series_id": "S000012098",
    "html_url": "https://fundwatcher.app/funds/LUTAX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.3735462968154249547869866711",
    "coverage_b_by_a": "0.3735462968154249547869866710",
    "shared_count": 200,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-01-31"
    },
    "a_top": [
      {
        "name": "US TREASURY N/B",
        "value": "190645703.60",
        "weight": "0.00888431",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "165138750.00",
        "weight": "0.00769566",
        "shared": true
      },
      {
        "name": "State Street Navigator Securities Lending Government Money Market Portfolio",
        "value": "164668533.70",
        "weight": "0.00767374",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "163674921.06",
        "weight": "0.00762744",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "159628985.18",
        "weight": "0.00743889",
        "shared": false
      },
      {
        "name": "Fixed Income Clearing Corporation",
        "value": "150000000.00",
        "weight": "0.00699017",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "138058593.75",
        "weight": "0.00643369",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "137107850.88",
        "weight": "0.00638938",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "128575293.29",
        "weight": "0.00599176",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "120426694.06",
        "weight": "0.00561202",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "119850000.00",
        "weight": "0.00558515",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "115542344.04",
        "weight": "0.00538441",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "113791992.75",
        "weight": "0.00530284",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "111415078.13",
        "weight": "0.00519207",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "109832421.60",
        "weight": "0.00511832",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "109443398.16",
        "weight": "0.00510019",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "108801758.35",
        "weight": "0.00507029",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "107916015.90",
        "weight": "0.00502901",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "100499765.38",
        "weight": "0.00468340",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "100261719.00",
        "weight": "0.00467231",
        "shared": true
      },
      {
        "name": "FN MA4159",
        "value": "98779032.06",
        "weight": "0.00460322",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "97866015.38",
        "weight": "0.00456067",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "95761425.00",
        "weight": "0.00446259",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "95332500.48",
        "weight": "0.00444260",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "90119530.80",
        "weight": "0.00419967",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "88831552.97",
        "weight": "0.00413965",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "88082812.96",
        "weight": "0.00410476",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "86803750.00",
        "weight": "0.00404515",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "86282187.50",
        "weight": "0.00402085",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "85538671.44",
        "weight": "0.00398620",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "84882890.63",
        "weight": "0.00395564",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "83519140.20",
        "weight": "0.00389209",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "82127929.05",
        "weight": "0.00382726",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "81673945.11",
        "weight": "0.00380610",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "81556875.00",
        "weight": "0.00380064",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "81160351.16",
        "weight": "0.00378217",
        "shared": true
      },
      {
        "name": "FN MA4398",
        "value": "79553080.99",
        "weight": "0.00370727",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "79373398.66",
        "weight": "0.00369889",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "78395156.25",
        "weight": "0.00365330",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "76939843.75",
        "weight": "0.00358549",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "75876000.00",
        "weight": "0.00353591",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "75372578.36",
        "weight": "0.00351245",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "75099023.25",
        "weight": "0.00349970",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "74850585.75",
        "weight": "0.00348812",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "74513671.50",
        "weight": "0.00347242",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "74349843.75",
        "weight": "0.00346479",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "71798847.84",
        "weight": "0.00334591",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "71224648.26",
        "weight": "0.00331915",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "71144531.25",
        "weight": "0.00331542",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "70688671.92",
        "weight": "0.00329417",
        "shared": true
      }
    ],
    "b_top": [
      {
        "name": "US TREASURY N/B",
        "value": "7364324.69",
        "weight": "0.00902005",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "7226458.75",
        "weight": "0.00885119",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "7147239.84",
        "weight": "0.00875416",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "7137579.38",
        "weight": "0.00874232",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "7020575.63",
        "weight": "0.00859902",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "6964203.75",
        "weight": "0.00852997",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "6960873.91",
        "weight": "0.00852589",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "6878995.31",
        "weight": "0.00842560",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "6455397.66",
        "weight": "0.00790677",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "6258761.25",
        "weight": "0.00766592",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5915567.81",
        "weight": "0.00724557",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5747253.75",
        "weight": "0.00703941",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5740836.56",
        "weight": "0.00703155",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5740098.91",
        "weight": "0.00703065",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5736990.00",
        "weight": "0.00702684",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5695685.94",
        "weight": "0.00697625",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "5677390.63",
        "weight": "0.00695384",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5673829.22",
        "weight": "0.00694948",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5620644.53",
        "weight": "0.00688434",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5409021.09",
        "weight": "0.00662513",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5395896.56",
        "weight": "0.00660906",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5323278.09",
        "weight": "0.00652011",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "5262232.50",
        "weight": "0.00644534",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4656691.56",
        "weight": "0.00570366",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4434222.34",
        "weight": "0.00543117",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4429633.59",
        "weight": "0.00542555",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "4358233.71",
        "weight": "0.00533810",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4329087.97",
        "weight": "0.00530240",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "4311615.55",
        "weight": "0.00528100",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "4212273.01",
        "weight": "0.00515932",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4190752.11",
        "weight": "0.00513296",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4188811.64",
        "weight": "0.00513058",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4179526.25",
        "weight": "0.00511921",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4179175.00",
        "weight": "0.00511878",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4170688.36",
        "weight": "0.00510839",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4150829.77",
        "weight": "0.00508406",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4147649.30",
        "weight": "0.00508017",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4129586.72",
        "weight": "0.00505804",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4129081.33",
        "weight": "0.00505742",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4125022.27",
        "weight": "0.00505245",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4110700.00",
        "weight": "0.00503491",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4110471.88",
        "weight": "0.00503463",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4105332.42",
        "weight": "0.00502834",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4082361.72",
        "weight": "0.00500020",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4079134.30",
        "weight": "0.00499625",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4067402.34",
        "weight": "0.00498188",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "4064365.00",
        "weight": "0.00497816",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4042121.48",
        "weight": "0.00495091",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4040269.84",
        "weight": "0.00494865",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "4038609.38",
        "weight": "0.00494661",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0001084380-26-000631",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1084380/000108438026000631/0001084380-26-000631-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001410368-26-033335",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/773757/000141036826033335/0001410368-26-033335-index.htm"
    }
  ]
}