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MBB vs MBSX

iShares MBS ETF

MBBANasdaq

Regan Fixed Rate MBS ETF

MBSX—NYSE Arca

Overlap

No data

Expense ratio

MBB −0.36pt a year

MBB0.04%MBSX0.40%

Avg volume · 30D

MBB 1486.6×the volume

MBB4.23MMBSX2.84K

MBB vs MBSX Performance

Oct 31, 2025 – Oct 30, 2026

+0.6%MBB−0.7%MBSX

Oct 31, 2025 to Oct 30, 2026. MBB +0.6%. MBSX −0.7%. Use the arrow keys to read each point.−5%5%10%Oct 2025Apr 2026Oct 2026
Expense ratio
MBB 0.04%, better
MBSX 0.40%
Fund size
MBB $35.9B
MBSX $19M
1Y total return
MBB +0.6%, better
MBSX −0.7%
Yield (12M)
MBB 4.42%, better
MBSX 3.90%
Holdings
MBB 10814
MBSX 104
Avg volume (30D)
MBB 4.23M sh, better
MBSX 2.84K sh
NAV per share
MBB $91.96
MBSX $26.47
52W range

ETF.net Grade

  • —MBSXUnder classification review
MBB: Cost 94, Risk 34, Mission 56, Tradability 89, Holdings 77, Durability 92.
Pillar letters and Scores for MBB, MBSX, with each pillar’s weight
PillarMBBMBSX
Cost30% weightA94Not scored
Mission25% weightB56Not scored
Risk15% weightD34Not scored
Tradability15% weightA89Not scored
Holdings10% weightA77Not scored
Durability5% weightA92Not scored

Rank among Mortgage-Backed Securities funds

How we build Categories ›

Mortgage-Backed Securities⁠

Category · 24 funds
See all 24 ›

MBB ranks 2nd of 24 funds in the Mortgage-Backed Securities Category.

  1. Rank 1ASPMBState Street SPDR Portfolio Mortgage Backed Bond ETFScore 75
  2. Rank 2AMBBiShares MBS ETFScore 73
  3. Rank 3AVMBSVanguard Mortgage-Backed Securities ETFScore 72
  4. MBSXNot yet graded

Our read on each fund

ETF.net Research

MBBAiShares MBS ETF

MBSX—Regan Fixed Rate MBS ETF

In short

MBB Launched 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.

MBSX No data

Stated mandate

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

MBSX No data

Why people hold it

  • MBB 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.

MBSX No data

Worth knowing

  • MBB 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.

MBSX No data

Full MBB profile⁠

Full MBSX profile⁠

MBB vs MBSX Holdings

How we measure overlap

Each holding counts at its smaller weight in the two funds, summed over the full Holdings. Sector, country and asset class use the same rule on each fund’s split. Cash, FX and derivative lines stay out of the counts. Two bond funds get no overlap figure.

MBB vs MBSX Cost

Overpaying MBSX vs MBB

$7,241

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

  • MBB 0.04%

    $849

  • MBSX 0.40%

    $8,090

$10,000
30 years

Cost over time

  • MBB 0.04%
  • MBSX 0.40%
  • Overpaying
One line per fund, from year 0 to year 30. Use the arrow keys to read each point.$0$2K$4K$6K$8K$10K051015202530MBSX $8,090MBB $849

Year by year

YearMBBMBSXOverpaying
10$73$723$650
20$288$2,793$2,505
30$849$8,090$7,241

Expense ratio

  • 0.04%MBB, cheaper
  • 0.40%MBSX
  • Middle half of Mortgage-Backed Securities funds
  • Median 0.38%

MBB 3rd cheapest of 24 funds

MBSX 15th cheapest of 24 funds

MBB vs MBSX Dividends

Last 12 months to Oct 30, 2026
Yield (12M)
MBB 4.42%, better
MBSX 3.90%
Payout (12M)
MBB $4.07
MBSX $1.00
Last payment
MBB $0.37
MBSX $0.05
Ex-dividend
MBB Oct 1, 2026
MBSX Oct 28, 2026
Paid on
MBB Oct 6, 2026
MBSX Oct 29, 2026
Frequency
MBB Monthly
MBSX Monthly

Distribution history

Per share, 2023 to 2026, same scale for both

MBBMonthly · 45 paymentsAll MBB payments⁠
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.$0$0.5020232026YTD
MBSXMonthly · 18 paymentsAll MBSX payments⁠
One bar per payment. 18 payments from 2023 to 2026 YTD. May 28, 2025 $0.02; Jun 26, 2025 $0.02; Jul 29, 2025 $0.03; Aug 27, 2025 $0.03; Sep 26, 2025 $0.05; Oct 29, 2025 $0.05; Nov 25, 2025 $0.04; Dec 23, 2025 $0.49; Jan 28, 2026 $0.04; Feb 25, 2026 $0.04; Mar 27, 2026 $0.05; Apr 28, 2026 $0.05; May 27, 2026 $0.05; Jun 26, 2026 $0.04; Jul 29, 2026 $0.05; Aug 27, 2026 $0.05; Sep 28, 2026 $0.05; Oct 28, 2026 $0.05. Use the arrow keys to read each point.$0$0.5020232026YTD

MBB vs MBSX Risk

Fall from peak · 5 years

This chart needs five years of history for both funds.

Risk facts

VolatilityStd dev, 3 years
MBB 6.4%MBSX 34.4%since Jun 2025
Return per unit of riskSharpe ratio, 3 years
MBB 0.30MBSX 0.15since Jun 2025
Worst fallMax drawdown, 5 years
MBB −16.8%MBSX −27.6%since May 2025
Market sensitivityBeta, 5 years
MBB 1.14MBSX 0.58

MBB and MBSX in the news

All news⁠

Popular comparisons

  • MBBAvsSPMBA

    iShares MBS ETF · State Street SPDR Portfolio Mortgage Backed Bond ETF

    Expense ratio
    0.04% · 0.04%
    Category
    Same Category. Both funds are graded against the same funds, so their Grades compare head to head.

  • MBSX—vsSPMBA

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  • MBBAvsVMBSA

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    Expense ratio
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    Category
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  • MBSX—vsVMBSA

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    Expense ratio
    0.40% · 0.03%
    Category
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  • MBBAvsSMBSA

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    Expense ratio
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    Category
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  • MBSX—vsSMBSA

    Regan Fixed Rate MBS ETF · Schwab Mortgage-Backed Securities ETF

    Expense ratio
    0.40% · 0.03%
    Category
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