{
  "page": "compare",
  "query": {
    "a": "FSTTX",
    "b": "BBMUX"
  },
  "retrieved_at": "2026-07-07T17:33:32+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": "American Funds Short-Term Tax-Exempt Bond Fund",
    "ticker": "FSTTX",
    "slug": "FSTTX",
    "series_id": "S000009233",
    "html_url": "https://fundwatcher.app/funds/FSTTX/"
  },
  "fund_b": {
    "name": "Bridge Builder Municipal Bond Fund",
    "ticker": "BBMUX",
    "slug": "BBMUX",
    "series_id": "S000050632",
    "html_url": "https://fundwatcher.app/funds/BBMUX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.05845200902117307369363570912",
    "coverage_b_by_a": "0.05845200902117307369363570913",
    "shared_count": 180,
    "as_of": {
      "a": "2026-01-31",
      "b": "2026-03-31"
    },
    "a_top": [
      {
        "name": "UTILITY-TE-2",
        "value": "22289480.00",
        "weight": "0.00962619",
        "shared": false
      },
      {
        "name": "UNIV OF MICHIGAN MI REGD V/R B/E 2.40000000",
        "value": "18600000.00",
        "weight": "0.00803281",
        "shared": false
      },
      {
        "name": "PEFA INC VAR",
        "value": "18563433.92",
        "weight": "0.00801701",
        "shared": true
      },
      {
        "name": "WASTE MANAGEMENT INC (MPT) 4.6% 10-01-46",
        "value": "17594710.00",
        "weight": "0.00759865",
        "shared": false
      },
      {
        "name": "CA STWD CMNTYS DEV-A",
        "value": "16689206.50",
        "weight": "0.00720759",
        "shared": false
      },
      {
        "name": "MS BUS FIN-VAR-J-CHEV",
        "value": "15300000.00",
        "weight": "0.00660763",
        "shared": false
      },
      {
        "name": "TRIBOROUGH NY BRIDGE & TUNNEL AUTH REVENUES",
        "value": "14800000.00",
        "weight": "0.00639169",
        "shared": false
      },
      {
        "name": "MUNIBOND",
        "value": "13649080.50",
        "weight": "0.00589465",
        "shared": true
      },
      {
        "name": "ARIZONA ST INDL DEV AUTH MF HS REGD V/R B/E 5.00000000",
        "value": "12679041.55",
        "weight": "0.00547571",
        "shared": false
      },
      {
        "name": "WASTE MANAGEMENT INC (MPT) 4.25% 06-01-48",
        "value": "11466338.65",
        "weight": "0.00495198",
        "shared": true
      },
      {
        "name": "SOUTHEAST ENERGY AUTH VAR",
        "value": "10777338.33",
        "weight": "0.00465442",
        "shared": true
      },
      {
        "name": "Los Angeles (City of), CA, Series 2025, RN",
        "value": "10115010.00",
        "weight": "0.00436838",
        "shared": false
      },
      {
        "name": "State of Georgia, Series 2022C",
        "value": "10074610.00",
        "weight": "0.00435093",
        "shared": false
      },
      {
        "name": "WASTE MANAGEMENT INC (MPT) 3.875% 08-01-38",
        "value": "10029470.00",
        "weight": "0.00433144",
        "shared": true
      },
      {
        "name": "HOUSTON TX UTILITY SYS REVENUE REGD V/R B/E 3.45000000",
        "value": "10000000.00",
        "weight": "0.00431871",
        "shared": false
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Refunding Series 2025A",
        "value": "9957705.23",
        "weight": "0.00430045",
        "shared": true
      },
      {
        "name": "UTAH ST HSG CORP MF REVENUE REGD N/C B/E HUD SEC 3.62500000",
        "value": "9830000.00",
        "weight": "0.00424529",
        "shared": false
      },
      {
        "name": "UNIV OF CALIFORNIA CA REVENUES REGD N/C B/E 5.00000000",
        "value": "9412139.07",
        "weight": "0.00406483",
        "shared": false
      },
      {
        "name": "VIRGINIA HSG DEV-G",
        "value": "9396183.77",
        "weight": "0.00405794",
        "shared": false
      },
      {
        "name": "State of Hawaii Department of Budget and Finance, The Queen's Health Systems, Series 2025B",
        "value": "9200000.00",
        "weight": "0.00397322",
        "shared": false
      },
      {
        "name": "MISSISSIPPI ST BUSINESS FIN COMMISSION GULF OPPORTUNITY ZONE",
        "value": "9200000.00",
        "weight": "0.00397322",
        "shared": false
      },
      {
        "name": "California Community Choice Financing Authority, Series F",
        "value": "9026444.36",
        "weight": "0.00389826",
        "shared": false
      },
      {
        "name": "State of Colorado, Series B",
        "value": "8949916.50",
        "weight": "0.00386521",
        "shared": false
      },
      {
        "name": "PREREF CENTRL FL EXPRESSWAY AUTH SR L REGD B/E PREREFUNDED 07/01/26 @ 100 4.00000000",
        "value": "8708428.37",
        "weight": "0.00376092",
        "shared": false
      },
      {
        "name": "BLACK BELT ENERGY GAS DISTRICT (MPT) 5.0% 03-01-55",
        "value": "8694931.42",
        "weight": "0.00375509",
        "shared": true
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Refunding Series 2024B",
        "value": "8639945.58",
        "weight": "0.00373134",
        "shared": true
      },
      {
        "name": "NEW YORK MUNI WTR-AA2",
        "value": "8253699.75",
        "weight": "0.00356454",
        "shared": false
      },
      {
        "name": "PREREF BEXAR CNTY TX REGD B/E PREREFUNDED 06/15/26 @ 100 5.00000000",
        "value": "8077896.00",
        "weight": "0.00348861",
        "shared": false
      },
      {
        "name": "QUEEN'S HEALTH SYSTEMS OBLIGATED GROUP FRN 07-01-51",
        "value": "8000000.00",
        "weight": "0.00345497",
        "shared": false
      },
      {
        "name": "PALMDALE FAMILY HOUSING LP (MPT) 2.95% 01-01-56",
        "value": "7961034.80",
        "weight": "0.00343814",
        "shared": false
      },
      {
        "name": "STHRN CA PUB PWR-B",
        "value": "7840918.80",
        "weight": "0.00338627",
        "shared": false
      },
      {
        "name": "STATE OF NORTH CAROLINA 5.0% 06-01-29",
        "value": "7796649.18",
        "weight": "0.00336715",
        "shared": false
      },
      {
        "name": "MI HSG ST DEV AUTH-A",
        "value": "7767187.95",
        "weight": "0.00335443",
        "shared": true
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Series 2024A-1",
        "value": "7418313.00",
        "weight": "0.00320376",
        "shared": true
      },
      {
        "name": "NYC TRANSITIONAL-F-1",
        "value": "7405853.00",
        "weight": "0.00319838",
        "shared": false
      },
      {
        "name": "HOUSTON TX ISD",
        "value": "7319753.80",
        "weight": "0.00316119",
        "shared": true
      },
      {
        "name": "LOS ANGELES DEPT-C",
        "value": "7267291.79",
        "weight": "0.00313853",
        "shared": true
      },
      {
        "name": "CARROLLTON-FARMERS BRANCH INDEPENDENT SCHOOL DISTRICT PSF-GTD 5.0% 02-15-27",
        "value": "7197512.00",
        "weight": "0.00310840",
        "shared": false
      },
      {
        "name": "NORTH PORT PRESERVATION LTD DIVIDEND HOUSING ASSOCIATION LLC FHA 223(F) (MPT) 5.0% 08-01-27",
        "value": "7149353.68",
        "weight": "0.00308760",
        "shared": false
      },
      {
        "name": "California Community Choice Financing Authority, Series B-1",
        "value": "7146357.68",
        "weight": "0.00308631",
        "shared": true
      },
      {
        "name": "California (State of) Community Choice Financing Authority (Clean Energy) (Green Bonds), Series 2024, RB",
        "value": "7142265.79",
        "weight": "0.00308454",
        "shared": false
      },
      {
        "name": "WISE VA IDA SW 3.125% MT",
        "value": "7072009.00",
        "weight": "0.00305420",
        "shared": true
      },
      {
        "name": "NEW HAVEN UNIFIED SCHOOL DISTRICT AG 0.0% 08-01-29",
        "value": "7002963.00",
        "weight": "0.00302438",
        "shared": false
      },
      {
        "name": "TX EXXON 12 G=EXXON V1",
        "value": "7000000.00",
        "weight": "0.00302310",
        "shared": false
      },
      {
        "name": "NYC MUNI WTR FIN-DD",
        "value": "6931892.50",
        "weight": "0.00299369",
        "shared": false
      },
      {
        "name": "EXXON MOBIL CORP FRN 12-01-40",
        "value": "6800000.00",
        "weight": "0.00293672",
        "shared": false
      },
      {
        "name": "RUSH SYSTEM FOR HEALTH OBLIGATED GROUP 5.0% 11-15-30",
        "value": "6785843.75",
        "weight": "0.00293061",
        "shared": false
      },
      {
        "name": "PORT OF PORTLAND OR AIRPORT REVENUE 5.0% 07-01-31",
        "value": "6678432.00",
        "weight": "0.00288422",
        "shared": false
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Series 2022A-1",
        "value": "6555042.00",
        "weight": "0.00283093",
        "shared": false
      },
      {
        "name": "DICKSON TN HLTH EDUCTNL & HSG FAC BRD MF REVENUE",
        "value": "6518635.31",
        "weight": "0.00281521",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "MONEY MARKET FUND",
        "value": "545327651.99",
        "weight": "0.02722540",
        "shared": false
      },
      {
        "name": "SOUTHEAST ENERGY-E",
        "value": "125810856.47",
        "weight": "0.00628109",
        "shared": false
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Refunding Series 2024B",
        "value": "77739118.85",
        "weight": "0.00388111",
        "shared": true
      },
      {
        "name": "California (State of) Community Choice Financing Authority (Clean Energy) (Green Bonds), Series 2024, RB",
        "value": "60407683.91",
        "weight": "0.00301584",
        "shared": false
      },
      {
        "name": "RESTRUCTURED-SER A-2",
        "value": "56416390.97",
        "weight": "0.00281658",
        "shared": false
      },
      {
        "name": "MIAMI-DADE CNTY FL AVIATION REVENUE",
        "value": "54821445.00",
        "weight": "0.00273695",
        "shared": true
      },
      {
        "name": "CHICAGO ILLIN 6% 4/1/2046",
        "value": "53594777.34",
        "weight": "0.00267571",
        "shared": false
      },
      {
        "name": "TN TNSUTL 5 12/01/2035",
        "value": "49781061.70",
        "weight": "0.00248531",
        "shared": false
      },
      {
        "name": "HARRIS CO CULTURAL-A",
        "value": "49155000.00",
        "weight": "0.00245406",
        "shared": false
      },
      {
        "name": "Southeast Energy Authority, Alabama, Revenue Bonds Cooperative District Energy Supply Series 2024C",
        "value": "46786941.80",
        "weight": "0.00233583",
        "shared": false
      },
      {
        "name": "TARRANT TX EDFC 5% 11/15/2051 MT",
        "value": "45149126.93",
        "weight": "0.00225406",
        "shared": false
      },
      {
        "name": "Main Street Energy, Inc., Series D",
        "value": "44787550.50",
        "weight": "0.00223601",
        "shared": false
      },
      {
        "name": "San Francisco City & County Airport Comm-San Francisco International Airport, Series C",
        "value": "44254876.00",
        "weight": "0.00220942",
        "shared": false
      },
      {
        "name": "MAIN STR NAT GA 0% MT",
        "value": "43092735.00",
        "weight": "0.00215140",
        "shared": false
      },
      {
        "name": "LAS VEGAS VLY WTR DT",
        "value": "42478185.60",
        "weight": "0.00212072",
        "shared": false
      },
      {
        "name": "NY TRANS CORP 5% 7/1/46 @",
        "value": "42277936.74",
        "weight": "0.00211072",
        "shared": false
      },
      {
        "name": "Tender Option Bond Trust Receipts/Certificates",
        "value": "41802162.50",
        "weight": "0.00208697",
        "shared": false
      },
      {
        "name": "PORT PORT ARTHUR TEX NAV DIST MOTIVA ENTERPRISES-C",
        "value": "41365000.00",
        "weight": "0.00206514",
        "shared": false
      },
      {
        "name": "TX TXSUTL 01/01/2055",
        "value": "40261435.30",
        "weight": "0.00201005",
        "shared": false
      },
      {
        "name": "Southeast Alabama Gas Supply District (The), Series A",
        "value": "39946614.63",
        "weight": "0.00199433",
        "shared": true
      },
      {
        "name": "SOUTHEAST ALA PREP 5% MT",
        "value": "39722249.63",
        "weight": "0.00198313",
        "shared": false
      },
      {
        "name": "MAIN STR NAT GA(RCC) 5% 9/1/30MT 53",
        "value": "39672118.67",
        "weight": "0.00198062",
        "shared": true
      },
      {
        "name": "Black Belt Energy Gas District, Series D",
        "value": "38355827.76",
        "weight": "0.00191491",
        "shared": true
      },
      {
        "name": "NH NFADEV 11/20/2042",
        "value": "38159213.41",
        "weight": "0.00190509",
        "shared": false
      },
      {
        "name": "UNIV CA REGENTS-CF",
        "value": "38069171.22",
        "weight": "0.00190060",
        "shared": false
      },
      {
        "name": "KENTUCKY ST PROPERTY & BLDGS C REGD N/C B/E 5.00000000",
        "value": "37006459.40",
        "weight": "0.00184754",
        "shared": false
      },
      {
        "name": "MAIN STR NAT GA 5% MT",
        "value": "36452844.08",
        "weight": "0.00181990",
        "shared": true
      },
      {
        "name": "MAIN STR NAT GA 5% 5/1/2055 MT",
        "value": "36182034.56",
        "weight": "0.00180638",
        "shared": false
      },
      {
        "name": "PATRIOTS EN GRP 5.25% MT",
        "value": "35974874.69",
        "weight": "0.00179604",
        "shared": true
      },
      {
        "name": "MUNIBOND",
        "value": "35913978.66",
        "weight": "0.00179300",
        "shared": true
      },
      {
        "name": "TN TNSUTL 5 11/01/2034",
        "value": "34946457.35",
        "weight": "0.00174470",
        "shared": false
      },
      {
        "name": "NE CENPWR 08/01/2055",
        "value": "34921508.42",
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      },
      {
        "name": "Black Belt Energy Gas District, Series F",
        "value": "34847183.21",
        "weight": "0.00173974",
        "shared": false
      },
      {
        "name": "LOWER AL GAS DT-A-REF",
        "value": "34796160.71",
        "weight": "0.00173719",
        "shared": true
      },
      {
        "name": "TX TAREDU 11/15/2064",
        "value": "34650779.04",
        "weight": "0.00172994",
        "shared": false
      },
      {
        "name": "Southeast Energy Authority, Alabama, A Cooperative District Energy Supply Revenue Bonds Series 2024A",
        "value": "33951173.12",
        "weight": "0.00169501",
        "shared": false
      },
      {
        "name": "MAIN STR NAT GA 4% 07/01/2052 MT",
        "value": "32539670.78",
        "weight": "0.00162454",
        "shared": true
      },
      {
        "name": "SOUTHEAST ENERGY-D",
        "value": "32427279.93",
        "weight": "0.00161893",
        "shared": false
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Refunding Series 2025A",
        "value": "32356932.41",
        "weight": "0.00161542",
        "shared": true
      },
      {
        "name": "ILLINOIS ST REGD B/E 5.00000000",
        "value": "31995900.00",
        "weight": "0.00159739",
        "shared": false
      },
      {
        "name": "PREREF CALIFORNIA HSG FIN AGY LTD OBL REGD V/R B/E PREREFUNDED 06/01/26 @ 100 3.60000000",
        "value": "31799001.48",
        "weight": "0.00158756",
        "shared": false
      },
      {
        "name": "ARKANSAS DEV FIN AUTH ENVIRONM REGD V/R B/E AMT 4.00000000",
        "value": "30710500.88",
        "weight": "0.00153322",
        "shared": false
      },
      {
        "name": "NJ EDA REV 5.25% 9/1/26",
        "value": "30335037.00",
        "weight": "0.00151447",
        "shared": false
      },
      {
        "name": "Black Belt Energy Gas District",
        "value": "30244956.85",
        "weight": "0.00150998",
        "shared": false
      },
      {
        "name": "Tarrant County Cultural Education Facilities Finance Corp.",
        "value": "30000000.00",
        "weight": "0.00149775",
        "shared": false
      },
      {
        "name": "California Community Choice Financing Authority",
        "value": "29451561.86",
        "weight": "0.00147036",
        "shared": false
      },
      {
        "name": "California Community Choice Financing Authority, Series C",
        "value": "29085550.93",
        "weight": "0.00145209",
        "shared": true
      },
      {
        "name": "S E ENERGY-B-REV",
        "value": "29020666.26",
        "weight": "0.00144885",
        "shared": true
      },
      {
        "name": "NEW JERSEY ST HLTH CARE FACS F REGD N/C B/E 5.00000000",
        "value": "28419954.15",
        "weight": "0.00141886",
        "shared": false
      },
      {
        "name": "TX TRANSPRTN FIN-A",
        "value": "27933188.69",
        "weight": "0.00139456",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0001193125-26-130879",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/845376/000119312526130879/0001193125-26-130879-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001003715-26-001898",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1567101/000100371526001898/0001003715-26-001898-index.htm"
    }
  ]
}