{
 "ticker": "MBB",
 "name": "iShares MBS ETF",
 "issuer": "iShares",
 "desk": "core",
 "url": "https://etfiq.com/funds/mbb",
 "html": "https://etfiq.com/funds/mbb",
 "markdown": "https://etfiq.com/funds/mbb.md",
 "as_of": "2026-10-28",
 "verdict": "MBB tracks an index of mortgage-backed securities and returned \u22120.8% over the past year.",
 "lead": "MBB returned \u22120.8% over the year to Oct 28, 2026, charges 0.04% a year and holds $35.5bn in net assets on Oct 28, 2026.",
 "category": {
  "id": "bonds",
  "name": "Bonds",
  "label": "Bond ETFs",
  "url": "https://etfiq.com/bonds/",
  "group": {
   "id": "taxable-bonds",
   "name": "Taxable bonds"
  },
  "segment": {
   "id": "government-mortgage",
   "name": "Government mortgage-backed",
   "url": "https://etfiq.com/bonds/government-mortgage/"
  },
  "status": "classified",
  "as_of": "2026-10-29",
  "method": "https://etfiq.com/methodology/categories"
 },
 "promise": {
  "badge": "delivered",
  "label": "Delivered",
  "category": "bonds",
  "sentence": "Over the year to Oct 28, 2026, MBB returned \u22120.8% against \u22121.1% for SPMB, which tracks the same Bloomberg U.S. MBS Index. Fees aside, MBB finished 0.30 points ahead of SPMB.",
  "figure": 0.3,
  "unit": "points",
  "from": "2025-10-28",
  "to": "2026-10-28",
  "url": "https://etfiq.com/promise-index/bonds/"
 },
 "key_facts": [
  {
   "key": "total_return_1_year",
   "label": "Total return, 1 year",
   "value": "\u22120.8%",
   "source": "computed by ETFIQ from Tiingo daily prices",
   "as_of": "2026-10-28",
   "sentence": "MBB, total return, 1 year: \u22120.8%, as of Oct 28, 2026.",
   "cite": {
    "value": "\u22120.8%",
    "as_of": "2026-10-28",
    "source": "computed by ETFIQ from Tiingo daily prices",
    "url": "https://etfiq.com/funds/mbb#fact-total-return-1-year",
    "text": "MBB, total return, 1 year: \u22120.8%, as of Oct 28, 2026."
   }
  },
  {
   "key": "expense_ratio",
   "label": "Expense ratio",
   "value": "0.04%",
   "source": "485BPOS XBRL, Jun 18, 2026",
   "as_of": "2026-06-18",
   "sentence": "MBB, expense ratio: 0.04%, as of Jun 18, 2026.",
   "cite": {
    "value": "0.04%",
    "as_of": "2026-06-18",
    "source": "485BPOS XBRL, Jun 18, 2026",
    "url": "https://etfiq.com/funds/mbb#fact-expense-ratio",
    "text": "MBB, expense ratio: 0.04%, as of Jun 18, 2026."
   }
  },
  {
   "key": "holdings",
   "label": "Holdings",
   "value": "10813",
   "source": "the issuer\u2019s daily holdings file",
   "as_of": "2026-10-27",
   "sentence": "MBB, holdings: 10813, as of Oct 27, 2026.",
   "cite": {
    "value": "10813",
    "as_of": "2026-10-27",
    "source": "the issuer\u2019s daily holdings file",
    "url": "https://etfiq.com/funds/mbb#fact-holdings",
    "text": "MBB, holdings: 10813, as of Oct 27, 2026."
   }
  },
  {
   "key": "below_its_high",
   "label": "Below its high",
   "value": "\u22122.9%",
   "source": "ETFIQ",
   "as_of": "2026-10-28",
   "sentence": "MBB, below its high: \u22122.9%, as of Oct 28, 2026.",
   "cite": {
    "value": "\u22122.9%",
    "as_of": "2026-10-28",
    "source": "ETFIQ",
    "url": "https://etfiq.com/funds/mbb#fact-below-its-high",
    "text": "MBB, below its high: \u22122.9%, as of Oct 28, 2026."
   }
  },
  {
   "key": "12_month_yield_capital_gains_included_on_its_starting_price",
   "label": "12-month yield, capital gains included, on its starting price",
   "value": "4.2%",
   "source": "computed by ETFIQ from Tiingo daily prices and distributions",
   "as_of": "2026-10-28",
   "sentence": "MBB, 12-month yield, capital gains included, on its starting price: 4.2%, as of Oct 28, 2026.",
   "cite": {
    "value": "4.2%",
    "as_of": "2026-10-28",
    "source": "computed by ETFIQ from Tiingo daily prices and distributions",
    "url": "https://etfiq.com/funds/mbb#fact-12-month-yield-capital-gains-included-on-its-starting-price",
    "text": "MBB, 12-month yield, capital gains included, on its starting price: 4.2%, as of Oct 28, 2026."
   }
  },
  {
   "key": "last_payment",
   "label": "Last payment (paid monthly), ex-date Oct 1, 2026",
   "value": "$0.3662",
   "source": "Tiingo end-of-day distributions",
   "as_of": "2026-10-01",
   "sentence": "MBB, last payment (paid monthly), ex-date Oct 1, 2026: $0.3662, as of Oct 1, 2026.",
   "cite": {
    "value": "$0.3662",
    "as_of": "2026-10-01",
    "source": "Tiingo end-of-day distributions",
    "url": "https://etfiq.com/funds/mbb#fact-last-payment",
    "text": "MBB, last payment (paid monthly), ex-date Oct 1, 2026: $0.3662, as of Oct 1, 2026."
   }
  },
  {
   "key": "net_assets",
   "label": "Net assets",
   "value": "$35.5bn",
   "source": "the issuer\u2019s own daily fund list, as of Oct 28, 2026",
   "as_of": "2026-10-28",
   "sentence": "MBB, net assets: $35.5bn (the issuer\u2019s own daily fund list, as of Oct 28, 2026).",
   "cite": {
    "value": "$35.5bn",
    "as_of": "2026-10-28",
    "source": "the issuer\u2019s own daily fund list, as of Oct 28, 2026",
    "url": "https://etfiq.com/funds/mbb#fact-net-assets",
    "text": "MBB, net assets: $35.5bn (the issuer\u2019s own daily fund list, as of Oct 28, 2026)."
   }
  }
 ],
 "fields": [
  {
   "key": "what_it_tracks",
   "label": "What it tracks",
   "value": "Bloomberg U.S. MBS Index",
   "source": null
  },
  {
   "key": "fund_type",
   "label": "Fund type",
   "value": "Bond fund",
   "source": null
  },
  {
   "key": "category",
   "label": "Category",
   "value": "Bonds \u00b7 Government mortgage-backed",
   "source": "ETFIQ"
  },
  {
   "key": "expense_ratio",
   "label": "Expense ratio",
   "value": "0.04%",
   "source": "485BPOS XBRL, Jun 18, 2026"
  },
  {
   "key": "price",
   "label": "Price",
   "value": "$91.41",
   "source": null
  },
  {
   "key": "first_traded",
   "label": "First traded",
   "value": "Mar 16, 2007",
   "source": null
  },
  {
   "key": "net_assets",
   "label": "Net assets",
   "value": "$35.5bn",
   "source": "the issuer\u2019s own daily fund list, as of Oct 28, 2026"
  },
  {
   "key": "benchmark",
   "label": "Benchmark",
   "value": "Bloomberg U.S. MBS Index, measured by SPMB, which tracks the same index",
   "source": "ETFIQ, from its filings"
  },
  {
   "key": "benchmark_named_in",
   "label": "Benchmark named in",
   "value": "its prospectus, 485BPOS, Jun 18, 2026",
   "source": null
  },
  {
   "key": "mbb_1_year_to_oct_28_2026",
   "label": "MBB, 1 year to Oct 28, 2026",
   "value": "\u22120.8%",
   "source": null
  },
  {
   "key": "spmb_the_same_days",
   "label": "SPMB, the same days",
   "value": "\u22121.1%",
   "source": null
  },
  {
   "key": "against_its_benchmark_1_year",
   "label": "Against its benchmark, 1 year",
   "value": "+0.3 pts",
   "source": "ETFIQ"
  },
  {
   "key": "below_its_high",
   "label": "Below its high",
   "value": "\u22122.9%",
   "source": "ETFIQ"
  },
  {
   "key": "holdings",
   "label": "Holdings",
   "value": "10813",
   "source": null
  },
  {
   "key": "top_ten_weight",
   "label": "Top ten weight",
   "value": "10.8%",
   "source": null
  },
  {
   "key": "holdings_published_for",
   "label": "Holdings published for",
   "value": "Oct 27, 2026",
   "source": "the issuer\u2019s daily file"
  },
  {
   "key": "holdings_as_of_the_close_of",
   "label": "Holdings as of the close of",
   "value": "Oct 27, 2026",
   "source": "the issuer\u2019s daily file"
  }
 ],
 "periods": [
  {
   "window": "1 month",
   "Total return": "+2.4%",
   "Benchmark (SPMB)": "+2.1%",
   "Gap to SPMB": "+0.3 pts"
  },
  {
   "window": "3 months",
   "Total return": "\u22120.8%",
   "Benchmark (SPMB)": "\u22121.1%",
   "Gap to SPMB": "+0.3 pts"
  },
  {
   "window": "6 months",
   "Total return": "\u22121.2%",
   "Benchmark (SPMB)": "\u22121.4%",
   "Gap to SPMB": "+0.2 pts"
  },
  {
   "window": "Year to date",
   "Total return": "\u22120.8%",
   "Benchmark (SPMB)": "\u22121.0%",
   "Gap to SPMB": "+0.2 pts"
  },
  {
   "window": "1 year",
   "Total return": "\u22120.8%",
   "Benchmark (SPMB)": "\u22121.1%",
   "Gap to SPMB": "+0.3 pts"
  },
  {
   "window": "3 years",
   "Total return": "+19.2%",
   "Benchmark (SPMB)": "+18.8%",
   "Gap to SPMB": "+0.4 pts"
  },
  {
   "window": "5 years",
   "Total return": "+0.6%",
   "Benchmark (SPMB)": "+0.4%",
   "Gap to SPMB": "+0.2 pts"
  },
  {
   "window": "10 years",
   "Total return": "+11.4%",
   "Benchmark (SPMB)": "+10.5%",
   "Gap to SPMB": "+0.9 pts"
  },
  {
   "window": "Since launch",
   "Total return": "+63.8%",
   "Benchmark (SPMB)": "not available",
   "Gap to SPMB": "not available"
  },
  {
   "window": "Since launch, annualised",
   "Total return": "+2.5%",
   "Benchmark (SPMB)": "\u2013",
   "Gap to SPMB": "\u2013"
  }
 ],
 "questions": [
  {
   "q": "How has MBB performed?",
   "a": "Over the year to Oct 28, 2026, MBB returned \u22120.8% with distributions reinvested, against \u22121.1% for its benchmark, the Bloomberg U.S. MBS Index. Over three years the number is +19.2%."
  },
  {
   "q": "What does MBB cost?",
   "a": "The prospectus expense ratio is 0.04% a year."
  },
  {
   "q": "How far is MBB below its high?",
   "a": "2.9% below its high of Feb 27, 2026, measured on the reinvested series to Oct 28, 2026."
  }
 ],
 "key_stats": [
  {
   "key": "high52",
   "label": "52-week high, daily closes to Oct 28, 2026",
   "value": "$96.91 on Feb 27, 2026",
   "as_of": "2026-02-27",
   "source": "computed by ETFIQ from Tiingo daily prices",
   "number": 96.91,
   "window": {
    "from": "2025-10-29",
    "to": "2026-10-28"
   }
  },
  {
   "key": "low52",
   "label": "52-week low, daily closes to Oct 28, 2026",
   "value": "$89.09 on Oct 5, 2026",
   "as_of": "2026-10-05",
   "source": "computed by ETFIQ from Tiingo daily prices",
   "number": 89.09,
   "window": {
    "from": "2025-10-29",
    "to": "2026-10-28"
   }
  },
  {
   "key": "inrange",
   "label": "Close on Oct 28, 2026, within that range",
   "value": "$91.41, 30% of the way from the low to the high",
   "as_of": "2026-10-28",
   "source": "computed by ETFIQ from Tiingo daily prices",
   "number": 91.41
  },
  {
   "key": "beta",
   "label": "Beta to its benchmark, 1 year",
   "value": "1.02, against SPMB",
   "as_of": "2026-10-28",
   "source": "computed by ETFIQ from Tiingo daily prices",
   "number": 1.02,
   "window": {
    "from": "2025-10-29",
    "to": "2026-10-28"
   }
  },
  {
   "key": "r2",
   "label": "R-squared, the same days",
   "value": "0.96",
   "as_of": "2026-10-28",
   "source": "computed by ETFIQ from Tiingo daily prices",
   "number": 0.9554,
   "window": {
    "from": "2025-10-29",
    "to": "2026-10-28"
   }
  },
  {
   "key": "betawin",
   "label": "Beta and R-squared measured over",
   "value": "251 daily total returns, Oct 29, 2025 to Oct 28, 2026",
   "as_of": "2026-10-28",
   "source": "computed by ETFIQ from Tiingo daily prices",
   "window": {
    "from": "2025-10-29",
    "to": "2026-10-28"
   }
  },
  {
   "key": "holdings",
   "label": "Holdings",
   "value": "10813",
   "as_of": "2026-10-28",
   "source": null
  },
  {
   "key": "top10",
   "label": "Top ten weight",
   "value": "10.8%",
   "as_of": "2026-10-28",
   "source": null
  }
 ],
 "trading": {
  "as_of": "2026-10-28",
  "score": 90,
  "tier": "Trades like a giant",
  "status": "scored",
  "lines": [
   "IQ Liquidity Score 90, Trades like a giant, 73rd percentile of 200 bonds ETFs.",
   "Trades like a giant: trades at a typical spread of 0.01%.",
   "$1,000: at least $0.05, 0.005%, one way, half a one-cent tick.",
   "$10,000: at least $0.55, 0.005%, one way, half a one-cent tick.",
   "Full cost to own, 1 year at $10,000: 0.11%, against 0.04% for the fee alone.",
   "Premium to NAV at the Oct 28 close: +0.10%; 95% of days within \u00b10.15%.",
   "Limit: midpoint + 1\u00a2 to buy, midpoint \u2212 1\u00a2 to sell. At the Oct 28 close of $91.41, that\u2019s $91.42 to buy and $91.40 to sell."
  ],
  "page": "https://etfiq.com/funds/mbb/trading/"
 },
 "flows": {
  "as_of": "2026-10-23",
  "coverage": "daily",
  "computed_by": "ETFIQ, from the change in shares outstanding times the previous day\u2019s NAV",
  "method": "https://etfiq.com/methodology/flows",
  "data": "https://etfiq.com/data/flows/funds/mbb.json",
  "windows": [
   {
    "window": "1 week",
    "from": "2026-10-21",
    "to": "2026-10-23",
    "net_flow_usd": 0,
    "net_flow": "$0",
    "round_trip_usd": 0,
    "days_counted": 3,
    "trading_days": 3
   },
   {
    "window": "1 month",
    "from": "2026-09-28",
    "to": "2026-10-23",
    "net_flow_usd": -1871906832,
    "net_flow": "\u2212$1.9bn",
    "round_trip_usd": 0,
    "days_counted": 20,
    "trading_days": 20
   },
   {
    "window": "3 months",
    "from": "2026-07-28",
    "to": "2026-10-23",
    "net_flow_usd": -2670146687,
    "net_flow": "\u2212$2.7bn",
    "round_trip_usd": 0,
    "days_counted": 63,
    "trading_days": 63
   },
   {
    "window": "Year to date",
    "from": "2026-01-02",
    "to": "2026-10-23",
    "net_flow_usd": -1805589431,
    "net_flow": "\u2212$1.8bn",
    "round_trip_usd": 0,
    "days_counted": 204,
    "trading_days": 204
   },
   {
    "window": "1 year",
    "from": "2025-10-28",
    "to": "2026-10-23",
    "net_flow_usd": -4835502635,
    "net_flow": "\u2212$4.8bn",
    "round_trip_usd": 0,
    "days_counted": 249,
    "trading_days": 249
   }
  ]
 },
 "generated": "2026-10-29",
 "license": "https://etfiq.com/license/",
 "license_text": "Data ETFIQ computes is free to use with attribution: ETFIQ (etfiq.com). Issuer data stays under its owner's terms.",
 "citation": "ETFIQ, MBB, bond fund, data as of Oct 28, 2026. https://etfiq.com/funds/mbb"
}