{
  "page": "compare",
  "query": {
    "a": "SPMB",
    "b": "SSASX"
  },
  "retrieved_at": "2026-07-07T18:31:18+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": "State Street(R) SPDR(R) Portfolio Mortgage Backed Bond ETF",
    "ticker": "SPMB",
    "slug": "SPMB",
    "series_id": "S000022922",
    "html_url": "https://fundwatcher.app/funds/SPMB/"
  },
  "fund_b": {
    "name": "State Street Income Fund",
    "ticker": "SSASX",
    "slug": "SSASX",
    "series_id": "S000071465",
    "html_url": "https://fundwatcher.app/funds/SSASX/"
  },
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    "coverage_b_by_a": "0.08367040024684100245566364206",
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      {
        "name": "U.S. Treasury Inflation-Protected Indexed Notes",
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      {
        "name": "U.S. Treasury Inflation-Indexed Notes",
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      {
        "name": "U.S. TREASURY INFLATION-PROTECTED SECURITIES 0-1/8% 01/15/2031",
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        "name": "GS Mortgage Securities Trust, Series 2019-GC42, Class A3",
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      {
        "name": "FNMA UMBS, 30 Year",
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      {
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      {
        "name": "Onslow Bay Financial LLC",
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      {
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      {
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      {
        "name": "US TREASURY N/B",
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        "name": "CROSS MORTGAGE TRUST CROSS 2025 H7 A1 144A",
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      {
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      {
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      {
        "name": "Fannie Mae Pool",
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      },
      {
        "name": "Fannie Mae Pool",
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        "name": "FHMS K097 A2",
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      {
        "name": "PRKCM 2025-AFC1 Trust 5.10",
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      },
      {
        "name": "Verus Securitization Trust, Series 2025-9, Class A1",
        "value": "2955613.58",
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      {
        "name": "CRWD 3 02/15/29",
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      {
        "name": "TPMT 2025-CES4 A1A",
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    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0001410368-26-055567",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1064642/000141036826055567/0001410368-26-055567-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001410368-26-055335",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1107414/000141036826055335/0001410368-26-055335-index.htm"
    }
  ]
}