{
  "page": "compare",
  "query": {
    "a": "TBIAX",
    "b": "IUSB"
  },
  "retrieved_at": "2026-07-07T17:11:12+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": "iShares Core Universal USD Bond ETF",
    "ticker": "IUSB",
    "slug": "IUSB",
    "series_id": "S000045644",
    "html_url": "https://fundwatcher.app/funds/IUSB/"
  },
  "overlap": {
    "coverage_a_by_b": "0.3925493486502920325952579665",
    "coverage_b_by_a": "0.3925493486502920325952579658",
    "shared_count": 6465,
    "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": true
      },
      {
        "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": "Blackrock Liquidity TempCash Inst",
        "value": "822411763.60",
        "weight": "0.02300976",
        "shared": false
      },
      {
        "name": "BlackRock Cash Funds: Treasury, SL Agency Shares",
        "value": "277711668.98",
        "weight": "0.00776993",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "136932677.34",
        "weight": "0.00383116",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "135287802.34",
        "weight": "0.00378514",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "134999640.00",
        "weight": "0.00377707",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "134941239.84",
        "weight": "0.00377544",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "132644526.56",
        "weight": "0.00371118",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "132543210.94",
        "weight": "0.00370835",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "126798137.50",
        "weight": "0.00354761",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "124916029.38",
        "weight": "0.00349495",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "122668955.86",
        "weight": "0.00343208",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "120323747.50",
        "weight": "0.00336647",
        "shared": true
      },
      {
        "name": "FN MA4018",
        "value": "119181573.13",
        "weight": "0.00333451",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "117069650.00",
        "weight": "0.00327542",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "114729254.06",
        "weight": "0.00320994",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "114274884.38",
        "weight": "0.00319723",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "109084013.44",
        "weight": "0.00305200",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "105997480.00",
        "weight": "0.00296564",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "104812217.50",
        "weight": "0.00293248",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "98514657.81",
        "weight": "0.00275628",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "98508934.84",
        "weight": "0.00275612",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "97120147.03",
        "weight": "0.00271727",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "95371225.12",
        "weight": "0.00266833",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "94887736.52",
        "weight": "0.00265481",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "94365195.31",
        "weight": "0.00264019",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "93653698.83",
        "weight": "0.00262028",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "93422575.00",
        "weight": "0.00261381",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "92575296.25",
        "weight": "0.00259011",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "92514708.13",
        "weight": "0.00258841",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "91043578.13",
        "weight": "0.00254725",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "91036098.75",
        "weight": "0.00254704",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "88399215.23",
        "weight": "0.00247327",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "87625179.14",
        "weight": "0.00245161",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "86772658.59",
        "weight": "0.00242776",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "86581129.69",
        "weight": "0.00242240",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "86445844.02",
        "weight": "0.00241862",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "85938438.83",
        "weight": "0.00240442",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "85578173.83",
        "weight": "0.00239434",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "85426879.38",
        "weight": "0.00239011",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "83756756.68",
        "weight": "0.00234338",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "83375586.67",
        "weight": "0.00233272",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "82005271.25",
        "weight": "0.00229438",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "80781146.72",
        "weight": "0.00226013",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "80364363.67",
        "weight": "0.00224847",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "80101991.99",
        "weight": "0.00224113",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "79555633.01",
        "weight": "0.00222584",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "79034308.28",
        "weight": "0.00221125",
        "shared": true
      },
      {
        "name": "G2 MA7192",
        "value": "78063240.24",
        "weight": "0.00218408",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "76639482.81",
        "weight": "0.00214425",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "76007421.88",
        "weight": "0.00212657",
        "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": "0002071691-26-007327",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1100663/000207169126007327/0002071691-26-007327-index.htm"
    }
  ]
}