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Launched · SEC filings

iShares MBS ETF

MBBNasdaqiSharesA

$91.73+0.03 (+0.03%)

At close: Nov 2, 2026, 4:00 PM ET

A73/ 100

Rank 2 of 25 in Mortgage-Backed Securities

A73/100Rank 2 of 25inMortgage-Backed Securities
Intraday session: up, 79 prints from 91.70 to 91.73. Range 91.64 to 91.94. Use the arrow keys to read each point.91.6591.8091.8591.9091.9510 AM12 PM2 PM4 PM
Expense ratio
0.04%
Fund size
$35.9B
1Y total return
+0.6%
Yield · Last 12 months
4.42%
Holdings
10814
Avg volume · 30D
4.23M sh
52W range
low $88.58high $96.97
Launched
Filings
SEC EDGAR

The ETF.net MBB Grade

A

Score 73 out of 100

Category
Mortgage-Backed Securities⁠
Rank
2 of 25
Six-pillar profile for MBB. Scores out of 100: Cost 94, Risk 34, Mission 56, Tradability 89, Holdings 77, Durability 92. Strongest: Cost (94). Weakest: Risk (34). No single pillar leads.

Score 73 of 100 falls in the A band. A is 70 or higher, B 55 to under 70, C 40 to under 55, D 25 to under 40, F under 25.

  • Cost

    The fund’s net expense ratio, ranked against its category.
    A94 out of 100
    Rank 1 of 25

  • Mission

    Whether the fund did what it promised, tested against its stated mandate.
    B56 out of 100
    Rank 10 of 21

  • Risk

    How the fund held up when markets fell: downside volatility, drawdowns and tail loss.
    D34 out of 100
    Rank 19 of 25

  • Tradability

    How easy the fund is to trade: daily volume, and how far its price strays from net asset value.
    A89 out of 100
    Rank 2 of 25

  • Holdings

    How concentrated the fund is, and how complete and current its disclosed holdings are.
    A77 out of 100
    Rank 6 of 25

  • Durability

    Whether the fund is likely to stay open, judged by its age, its assets and its issuer’s assets.
    A92 out of 100
    Rank 1 of 25

Our read on MBB

ETF.net Research

In short

ALaunched in 2007, MBB is the plain-vanilla way to own U.S. agency mortgage bonds: one of the biggest and busiest funds in a small niche, tracking the Bloomberg U.S. MBS Index for four basis points.

Stated mandate

The fund seeks to track an index composed of U.S. agency mortgage-backed securities.

Why people hold it

  • Four basis points to rent the entire agency mortgage market, against a category median near 0.35%. In low-coupon bond land, that gap compounds quietly.
  • Scale is the real feature: one of the largest and most actively traded funds in the mortgage-bond category, which generally shows up as tighter spreads.
  • Pays monthly, and the mandate stays narrow: an index of U.S. agency mortgage-backed securities, nothing exotic bolted on.
  • Among the stronger builds in a thin peer group of mortgage-bond ETFs, on the combination of cost, trading friction and issuer staying power.

Worth knowing

  • This is one slice of the bond market. Agency mortgage paper only, with no Treasuries or corporates alongside it.
  • Mortgage bonds cut both ways with rates: borrowers refinance when yields fall and sit tight when they rise, so the portfolio's duration shifts underneath you.
  • On price it's a photo finish: SPMB tracks the same index at the same 0.04%, and VMBS runs a basis point cheaper.

MBB Holdings

Holdings pillarA77 out of 100Rank 6 of 25 in Mortgage-Backed Securities
Asset class
Bonds
Holdings
10,814
Top-10 weight
11%
Largest holding
BlackRock Cash Class Inst Sl Agency5.3%

Sectors

  • Federal National Mortgage Association42.8%
  • Federal Home Loan Mortgage Corporation30.4%
  • Government National Mortgage Association24.1%
  • Uniform MBS2.7%

Geography

  • United States100.00%
The fund’s holdings, weight-ordered — page 1 of 721.
#TickerCompanyWeight %SharesMarket valueHeld by ETFs
1No dataBlackRock Cash Class Inst Sl Agency5.35%0$1.92B18
2No dataFhlmc 30YR Umbs Super 2.00% 05/01/20511.05%0$378M22
3No dataUmbs 30YR Tba(Reg A) 5.50% 11/12/20260.86%0$308M54
4No dataGNMA2 30YR Tba 6.00% 11/19/20260.70%0$251M42
5No dataGNMA2 30YR 5.00% 11/20/20540.59%0$212M20
6No dataGNMA2 30YR 2.00% 10/20/20510.54%0$194M16
7No dataGNMA2 30YR 2.00% 12/20/20510.53%0$191M24
8No dataFnma 30YR Umbs 2.00% 12/01/20510.53%0$189M18
9No dataGNMA2 30YR 2.50% 07/20/20510.52%0$185M23
10No dataFhlmc 30YR Umbs Super 2.00% 04/01/20510.51%0$181M19
11No dataGNMA2 30YR Tba(Reg C) 5.50% 11/19/20260.49%0$176M40
12No dataFnma 30YR Umbs 2.00% 11/01/20510.45%0$161M20
13No dataGNMA2 30YR 5.00% 04/20/20560.43%0$156M22
14No dataGNMA2 30YR 5.50% 09/20/20530.40%0$145M18
15No dataGNMA2 30YR 5.50% 09/20/20550.40%0$143M23

Showing 1–15 of 10814 holdings

MBB Performance

Launched Mar 13, 2007

Shows how $10,000 changes over the selected period, with cash distributions reinvested at the closing price on each ex-dividend date.

MBB$10,059
SPY tracks large US stocks. It provides market context, rather than representing this fund’s strategy, asset class or investment benchmark.$11,199
Oct 31, 2025 to Oct 30, 2026. MBB $10,059. SPY $11,199. Use the arrow keys to read each point.$10,000$11,000Oct 2025Apr 2026Oct 2026

Oct 31, 2025 – Oct 30, 2026

Returns run to the Oct 30, 2026 close, with cash distributions reinvested. Each period starts on the same date that many months or years earlier. Periods over one year show the average yearly return.

Trailing total return for MBB. Periods over one year show the average yearly return.
PeriodMBB
Year to date−0.1%
1 month+3.1%
3 months+0.2%
1 year+0.6%
3 yearsper year+6.3%
5 yearsper year+0.2%
10 yearsper year+1.1%

With distributions reinvested.

Calendar-year total return with cash distributions hypothetically reinvested at the ex-dividend date’s closing price. The current year shows year to date.

Annual total returns for MBB
YearReturn barMBB
2026 YTD−0.1%
2025+8.4%
2024+1.3%
2023+5.0%
2022−11.7%
2021−1.6%
2020+4.1%

MBB in the news

MBB Dividends

Adds up every distribution paid per share over the last 12 months, divided by the last completed close. Distributions are counted by ex-date. Data through Oct 30, 2026.
4.42%Last 12 months
Payout per share
$4.07Last 12 months
Last payment
$0.37 per share
Paid on
Shares bought on or after this date do not qualify for this distribution.
Frequency
Monthly

Distribution history

2023–2026

One bar per payment. 45 payments from 2023 to 2026 YTD. Feb 1, 2023 $0.24; Mar 1, 2023 $0.25; Apr 3, 2023 $0.25; May 1, 2023 $0.26; Jun 1, 2023 $0.27; Jul 3, 2023 $0.26; Aug 1, 2023 $0.28; Sep 1, 2023 $0.26; Oct 2, 2023 $0.29; Nov 1, 2023 $0.27; Dec 1, 2023 $0.28; Dec 14, 2023 $0.28; Feb 1, 2024 $0.30; Mar 1, 2024 $0.29; Apr 1, 2024 $0.28; May 1, 2024 $0.28; Jun 3, 2024 $0.30; Jul 1, 2024 $0.31; Aug 1, 2024 $0.31; Sep 3, 2024 $0.32; Oct 1, 2024 $0.31; Nov 1, 2024 $0.31; Dec 2, 2024 $0.31; Dec 18, 2024 $0.29; Feb 3, 2025 $0.34; Mar 3, 2025 $0.32; Apr 1, 2025 $0.33; May 1, 2025 $0.33; Jun 2, 2025 $0.33; Jul 1, 2025 $0.33; Aug 1, 2025 $0.33; Sep 2, 2025 $0.34; Oct 1, 2025 $0.34; Nov 3, 2025 $0.34; Dec 1, 2025 $0.35; Dec 19, 2025 $0.33; Feb 2, 2026 $0.33; Mar 2, 2026 $0.33; Apr 1, 2026 $0.33; May 1, 2026 $0.33; Jun 1, 2026 $0.33; Jul 1, 2026 $0.34; Aug 3, 2026 $0.34; Sep 1, 2026 $0.34; Oct 1, 2026 $0.37. Use the arrow keys to read each point.2023202420252026YTD
Ex-datePay dateAmount per share
Nov 2, 2026Pays Nov 5, 2026$0.35
Oct 1, 2026Oct 6, 2026$0.37
Sep 1, 2026Sep 4, 2026$0.34
Aug 3, 2026Aug 6, 2026$0.34
Jul 1, 2026Jul 7, 2026$0.34
Jun 1, 2026Jun 4, 2026$0.33
May 1, 2026May 6, 2026$0.33
Apr 1, 2026Apr 7, 2026$0.33
Mar 2, 2026Mar 5, 2026$0.33
Feb 2, 2026Feb 5, 2026$0.33
Dec 19, 2025Dec 24, 2025$0.33
Dec 1, 2025Dec 4, 2025$0.35

See all 229 payments⁠

$10,000 in MBB 10 years ago paid $2,600 in dividends.⁠

MBB Risk

Risk pillarD34 out of 100Rank 19 of 25 in Mortgage-Backed Securities
How much the fund’s monthly returns vary, scaled to a year.
6.4%
Annualised · 36 months to Oct 2026
How it’s calculated: standard deviation

The sample standard deviation of monthly total returns, multiplied by the square root of 12.

Uses up to 36 complete months, with at least 12 required. Total returns include reinvested distributions.

Return above 3-month US Treasury bills per unit of volatility.
0.30
vs 3-month T-bills · to Oct 2026
How it’s calculated: Sharpe ratio

Subtract each month’s Treasury-bill return from the fund’s monthly total return.

Divide the average of those excess returns by their sample standard deviation, then multiply by the square root of 12.

Uses up to 36 complete months, with at least 12 required. Each month uses the Treasury yield quoted at the end of the previous month.

The largest fall from a peak to the low that followed.
−16.8%
Trough Oct 2023
How it’s calculated: maximum drawdown

The largest percentage decline from an earlier peak, using total returns with reinvested distributions.

Uses up to five years through the last close, with at least 12 months required.

How strongly the fund’s returns move with its asset-class index.
1.14
vs its asset-class index
How it’s calculated: beta

The beta figure is supplied by FMP. The comparison index depends on the fund’s broad asset class.

FMP measures it over up to five years of monthly returns.

MBB Cost

Compare MBB and VMBS

Overpaying vs VMBS, tied cheapest in Mortgage-Backed Securities

$211

On $10,000 over 30 years. 7% growth a year before fees, expense ratio only.

  • MBB 0.04%

    $849

  • VMBS 0.03% Tied cheapest

    $638

$10,000
30 years

Cost over time

  • MBB 0.04%
  • VMBS 0.03%
  • Overpaying
One line per fund, from year 0 to year 30. Use the arrow keys to read each point.$0$200$400$600$800$1K051015202530MBB $849VMBS $638

Year by year

YearMBBVMBSOverpaying
10$73$55$18
20$288$216$72
30$849$638$211

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