{
  "page": "compare",
  "query": {
    "a": "FMGAX",
    "b": "FSEC"
  },
  "retrieved_at": "2026-07-07T16:46:16+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": "Fidelity Advisor Mortgage Securities Fund",
    "ticker": "FMGAX",
    "slug": "FMGAX",
    "series_id": "S000005133",
    "html_url": "https://fundwatcher.app/funds/FMGAX/"
  },
  "fund_b": {
    "name": "Fidelity Investment Grade Securitized ETF",
    "ticker": "FSEC",
    "slug": "FSEC",
    "series_id": "S000071132",
    "html_url": "https://fundwatcher.app/funds/FSEC/"
  },
  "overlap": {
    "coverage_a_by_b": "0.4295448999252259793334139603",
    "coverage_b_by_a": "0.4295448999252259793334139602",
    "shared_count": 425,
    "as_of": {
      "a": "2026-02-28",
      "b": "2026-02-28"
    },
    "a_top": [
      {
        "name": "GNII II 5.5% 03/01/2056 #TBA",
        "value": "84043377.80",
        "weight": "0.07009761",
        "shared": true
      },
      {
        "name": "Uniform Mortgage-Backed Security, TBA",
        "value": "71180704.40",
        "weight": "0.05936931",
        "shared": true
      },
      {
        "name": "G2SF 5.5 4/25",
        "value": "65439536.11",
        "weight": "0.05458080",
        "shared": true
      },
      {
        "name": "Government National Mortgage Association, TBA",
        "value": "48310513.69",
        "weight": "0.04029409",
        "shared": true
      },
      {
        "name": "Fidelity Cash Central Fund",
        "value": "43190155.63",
        "weight": "0.03602338",
        "shared": true
      },
      {
        "name": "FNCL 2 4/26",
        "value": "42488824.86",
        "weight": "0.03543842",
        "shared": true
      },
      {
        "name": "Fannie Mae or Freddie Mac",
        "value": "42232124.48",
        "weight": "0.03522432",
        "shared": true
      },
      {
        "name": "FNCL 6 3/24",
        "value": "28515633.16",
        "weight": "0.02378388",
        "shared": true
      },
      {
        "name": "FNCI 5 4/21",
        "value": "23716492.39",
        "weight": "0.01978109",
        "shared": true
      },
      {
        "name": "G2SF 6 4/25",
        "value": "20646541.58",
        "weight": "0.01722055",
        "shared": true
      },
      {
        "name": "G2 MA7986",
        "value": "16763505.43",
        "weight": "0.01398185",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "16019906.25",
        "weight": "0.01336164",
        "shared": true
      },
      {
        "name": "FREDDIE MAC POOL FR SD0958",
        "value": "9347324.64",
        "weight": "0.00779627",
        "shared": false
      },
      {
        "name": "G2 MB0024",
        "value": "8994168.16",
        "weight": "0.00750172",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "8438701.54",
        "weight": "0.00703842",
        "shared": true
      },
      {
        "name": "GNII II 6.5% 03/01/2056 #TBA",
        "value": "8313972.00",
        "weight": "0.00693439",
        "shared": true
      },
      {
        "name": "G2 MA7136",
        "value": "7849029.04",
        "weight": "0.00654660",
        "shared": false
      },
      {
        "name": "G2 MA7534",
        "value": "7805071.88",
        "weight": "0.00650993",
        "shared": false
      },
      {
        "name": "G2 MA7135",
        "value": "7651670.64",
        "weight": "0.00638199",
        "shared": false
      },
      {
        "name": "G2 MA7880",
        "value": "7369394.31",
        "weight": "0.00614655",
        "shared": false
      },
      {
        "name": "G2 MA8043",
        "value": "7293301.83",
        "weight": "0.00608308",
        "shared": true
      },
      {
        "name": "FR SD8121",
        "value": "7183818.39",
        "weight": "0.00599177",
        "shared": true
      },
      {
        "name": "FNMA 15YR 2% 07/35#CA6242",
        "value": "7095550.57",
        "weight": "0.00591815",
        "shared": false
      },
      {
        "name": "G2 MA7988",
        "value": "6508122.10",
        "weight": "0.00542819",
        "shared": true
      },
      {
        "name": "FR SD7535",
        "value": "5925093.07",
        "weight": "0.00494191",
        "shared": true
      },
      {
        "name": "Uniform Mortgage-Backed Securities",
        "value": "5513980.49",
        "weight": "0.00459902",
        "shared": true
      },
      {
        "name": "FORDF 2023-1 A1 144A 4.92% 05-15-28",
        "value": "5110184.70",
        "weight": "0.00426222",
        "shared": true
      },
      {
        "name": "ONEMAIN FINANCIAL ISSUANCE TRUST 2025-1 SER 2025-1A CL A REGD 144A P/P 4.82000000",
        "value": "5095313.00",
        "weight": "0.00424982",
        "shared": true
      },
      {
        "name": "FNCL 5.5 3/25",
        "value": "5080469.00",
        "weight": "0.00423744",
        "shared": true
      },
      {
        "name": "Uniform Mortgage-Backed Security, TBA",
        "value": "4984687.68",
        "weight": "0.00415755",
        "shared": true
      },
      {
        "name": "Freddie Mac Pool",
        "value": "4851274.13",
        "weight": "0.00404628",
        "shared": true
      },
      {
        "name": "FNMA 30YR 6% 11/01/2054#FA2958",
        "value": "4456713.59",
        "weight": "0.00371719",
        "shared": true
      },
      {
        "name": "Freddie Mac Multifamily Structured Pass Through Certificates",
        "value": "4397456.70",
        "weight": "0.00366776",
        "shared": true
      },
      {
        "name": "FNMA 30YR 2.5% 09/01/2050#FM4342",
        "value": "4033831.29",
        "weight": "0.00336448",
        "shared": false
      },
      {
        "name": "G2 MA6930",
        "value": "4017121.55",
        "weight": "0.00335054",
        "shared": true
      },
      {
        "name": "FNMA 30YR 6.5% 07/01/2054#CB8867",
        "value": "3697836.88",
        "weight": "0.00308423",
        "shared": true
      },
      {
        "name": "FNMA 30YR 3% 12/01/2049#FM2077",
        "value": "3653762.30",
        "weight": "0.00304747",
        "shared": false
      },
      {
        "name": "FNMA 30YR 6% 07/01/2055#FA3377",
        "value": "3653332.33",
        "weight": "0.00304712",
        "shared": true
      },
      {
        "name": "CGCMT 2016-P4 A4",
        "value": "3625137.56",
        "weight": "0.00302360",
        "shared": false
      },
      {
        "name": "Government National Mortgage Association",
        "value": "3608447.54",
        "weight": "0.00300968",
        "shared": false
      },
      {
        "name": "FR SD8106",
        "value": "3591486.86",
        "weight": "0.00299553",
        "shared": true
      },
      {
        "name": "FHLG 30YR 6.5% 09/01/2054#SD6617",
        "value": "3588569.64",
        "weight": "0.00299310",
        "shared": true
      },
      {
        "name": "BX TRUST",
        "value": "3541431.03",
        "weight": "0.00295378",
        "shared": true
      },
      {
        "name": "G2 MA7051",
        "value": "3336425.33",
        "weight": "0.00278279",
        "shared": false
      },
      {
        "name": "FNMA 30YR 2.5% 04/01/2052#FA2214",
        "value": "3246553.22",
        "weight": "0.00270784",
        "shared": true
      },
      {
        "name": "FR SD7530",
        "value": "3196343.96",
        "weight": "0.00266596",
        "shared": true
      },
      {
        "name": "FREDDIE MAC POOL FR RA5117",
        "value": "3070362.43",
        "weight": "0.00256088",
        "shared": true
      },
      {
        "name": "FHMS K555 SOFR30A+50 11/25/2030",
        "value": "3000449.70",
        "weight": "0.00250257",
        "shared": true
      },
      {
        "name": "FHLG 30YR 6% 02/01/2055#SL0360",
        "value": "2940042.11",
        "weight": "0.00245219",
        "shared": false
      },
      {
        "name": "FHLG 30YR 5.5% 03/01/2053#SD7559",
        "value": "2931763.89",
        "weight": "0.00244528",
        "shared": true
      }
    ],
    "b_top": [
      {
        "name": "Government National Mortgage Association, TBA",
        "value": "483742815.28",
        "weight": "0.06464782",
        "shared": true
      },
      {
        "name": "GNII II 5.5% 03/01/2056 #TBA",
        "value": "399301001.68",
        "weight": "0.05336294",
        "shared": true
      },
      {
        "name": "G2SF 5.5 4/25",
        "value": "248427400.13",
        "weight": "0.03320006",
        "shared": true
      },
      {
        "name": "FNCL 6 3/24",
        "value": "218790811.26",
        "weight": "0.02923940",
        "shared": true
      },
      {
        "name": "GNMA TBA",
        "value": "217347872.34",
        "weight": "0.02904657",
        "shared": false
      },
      {
        "name": "Fannie Mae or Freddie Mac",
        "value": "203673557.06",
        "weight": "0.02721912",
        "shared": true
      },
      {
        "name": "G2SF 6 4/25",
        "value": "184748312.76",
        "weight": "0.02468993",
        "shared": true
      },
      {
        "name": "Government National Mortgage Association, TBA",
        "value": "146495985.21",
        "weight": "0.01957786",
        "shared": false
      },
      {
        "name": "FNCI 5 4/21",
        "value": "129235859.59",
        "weight": "0.01727120",
        "shared": true
      },
      {
        "name": "G2SF 2 4/26",
        "value": "114640181.31",
        "weight": "0.01532062",
        "shared": false
      },
      {
        "name": "FNCL 5.5 3/25",
        "value": "113904114.98",
        "weight": "0.01522225",
        "shared": true
      },
      {
        "name": "G2SF 5 4/26",
        "value": "92849049.26",
        "weight": "0.01240843",
        "shared": false
      },
      {
        "name": "G2SF 5 3/25",
        "value": "92821106.02",
        "weight": "0.01240470",
        "shared": false
      },
      {
        "name": "FR SD7548",
        "value": "72579012.52",
        "weight": "0.00969952",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "62499851.09",
        "weight": "0.00835254",
        "shared": false
      },
      {
        "name": "G2SF 2.5 4/24",
        "value": "62214482.10",
        "weight": "0.00831440",
        "shared": false
      },
      {
        "name": "FEDERAL NAT MTG ASN GTD REM PA 21-13 BE 1.25% 02/25/2050",
        "value": "60804827.37",
        "weight": "0.00812601",
        "shared": false
      },
      {
        "name": "FNMA 30YR 5.5% 04/01/2055#CC0241",
        "value": "58594135.85",
        "weight": "0.00783057",
        "shared": false
      },
      {
        "name": "Fidelity Cash Central Fund",
        "value": "56434037.33",
        "weight": "0.00754190",
        "shared": true
      },
      {
        "name": "FHLG 30YR 2.5% 04/01/2052#SL1958",
        "value": "55349472.88",
        "weight": "0.00739695",
        "shared": false
      },
      {
        "name": "Uniform Mortgage-Backed Security, TBA",
        "value": "50621530.61",
        "weight": "0.00676511",
        "shared": true
      },
      {
        "name": "G2 MA7988",
        "value": "48748836.81",
        "weight": "0.00651484",
        "shared": true
      },
      {
        "name": "FNMA 30YR 2.5% 09/01/2050#CA6947",
        "value": "47460564.37",
        "weight": "0.00634267",
        "shared": false
      },
      {
        "name": "FNMA 30YR 2.5% 08/01/2050#CA6709",
        "value": "44071690.47",
        "weight": "0.00588978",
        "shared": false
      },
      {
        "name": "FNMA 30YR 2.5% 09/01/2051#CB1547",
        "value": "43280945.66",
        "weight": "0.00578410",
        "shared": false
      },
      {
        "name": "FHLG 15YR 1.5% 05/01/2036#RC1950",
        "value": "40919245.84",
        "weight": "0.00546848",
        "shared": false
      },
      {
        "name": "FR SD8106",
        "value": "40008328.40",
        "weight": "0.00534675",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "35198268.27",
        "weight": "0.00470393",
        "shared": true
      },
      {
        "name": "FNMA 30YR 2.5% 12/01/2051#FM9695",
        "value": "34666333.20",
        "weight": "0.00463284",
        "shared": false
      },
      {
        "name": "G2 MA8043",
        "value": "34471577.82",
        "weight": "0.00460681",
        "shared": true
      },
      {
        "name": "G2 MB0024",
        "value": "32671449.84",
        "weight": "0.00436624",
        "shared": true
      },
      {
        "name": "Ginnie Mae",
        "value": "32659280.12",
        "weight": "0.00436462",
        "shared": false
      },
      {
        "name": "G2SF 4.5 4/26",
        "value": "32611354.63",
        "weight": "0.00435821",
        "shared": false
      },
      {
        "name": "GNII II 6.5% 03/01/2056 #TBA",
        "value": "30840559.38",
        "weight": "0.00412156",
        "shared": true
      },
      {
        "name": "US TREASURY N/B",
        "value": "29038462.50",
        "weight": "0.00388073",
        "shared": true
      },
      {
        "name": "FHLG 30YR 5% 08/01/2052#SD1482",
        "value": "28498900.47",
        "weight": "0.00380862",
        "shared": false
      },
      {
        "name": "FNCL 5 3/24",
        "value": "28126873.60",
        "weight": "0.00375890",
        "shared": true
      },
      {
        "name": "ONEMAIN FINL ISSUANCE TR 2019-2 3.14% 10/14/2036 144A",
        "value": "27506723.90",
        "weight": "0.00367602",
        "shared": false
      },
      {
        "name": "Freddie Mac Multifamily Structured Pass Through Certificates",
        "value": "27284219.95",
        "weight": "0.00364629",
        "shared": true
      },
      {
        "name": "FNMA 30YR 6% 11/01/2054#FA2958",
        "value": "26636639.72",
        "weight": "0.00355974",
        "shared": true
      },
      {
        "name": "TOYOTA LEASE OWNER TRUST 2026-A 4.09% 02/22/2028 144A",
        "value": "26008627.67",
        "weight": "0.00347582",
        "shared": false
      },
      {
        "name": "Uniform Mortgage-Backed Security, TBA",
        "value": "25610647.79",
        "weight": "0.00342263",
        "shared": false
      },
      {
        "name": "FNCL 4.5 4/26",
        "value": "25521619.13",
        "weight": "0.00341073",
        "shared": false
      },
      {
        "name": "FR RB5099",
        "value": "25358519.25",
        "weight": "0.00338894",
        "shared": true
      },
      {
        "name": "Freddie Mac Pool",
        "value": "24861139.17",
        "weight": "0.00332246",
        "shared": false
      },
      {
        "name": "FNMA POOL MA4202 FN 12/40 FIXED 1.5",
        "value": "24737225.38",
        "weight": "0.00330591",
        "shared": true
      },
      {
        "name": "FNMA 15YR 1.5% 04/01/2036#FM6100",
        "value": "22165178.00",
        "weight": "0.00296217",
        "shared": false
      },
      {
        "name": "UMBS",
        "value": "21941040.96",
        "weight": "0.00293222",
        "shared": true
      },
      {
        "name": "UMBS",
        "value": "21769809.64",
        "weight": "0.00290934",
        "shared": false
      },
      {
        "name": "US TREASURY N/B",
        "value": "21514750.00",
        "weight": "0.00287525",
        "shared": true
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0000035402-26-002564",
      "as_of": "2026-02-28",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/795422/000003540226002564/0000035402-26-002564-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0000035402-26-002610",
      "as_of": "2026-02-28",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1562565/000003540226002610/0000035402-26-002610-index.htm"
    }
  ]
}