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MBB vs PMBS

iShares MBS ETF

MBBANasdaq

PIMCO Mortgage-Backed Securities Active Exchange-Traded Fund

PMBSDNasdaq

Overlap

No data

Expense ratio

MBB −0.79pt a year

MBB0.04%PMBS0.83%

Avg volume · 30D

MBB 26.6×the volume

MBB4.23MPMBS159K

MBB vs PMBS Performance

Oct 31, 2025 – Oct 30, 2026

+0.6%MBB−0.1%PMBS

Oct 31, 2025 to Oct 30, 2026. MBB +0.6%. PMBS −0.1%. Use the arrow keys to read each point.−3%−2%−1%2%3%Oct 2025Apr 2026Oct 2026
Expense ratio
MBB 0.04%, better
PMBS 0.83%
Fund size
MBB $35.9B
PMBS $1.35B
1Y total return
MBB +0.6%, better
PMBS −0.1%
Yield (12M)
MBB 4.42%
PMBS 4.89%, better
Holdings
MBB 10814
PMBS 1233
Avg volume (30D)
MBB 4.23M sh, better
PMBS 159K sh
NAV per share
MBB $91.96
PMBS $47.32
52W range

ETF.net Grade

MBB: Cost 94, Risk 34, Mission 56, Tradability 89, Holdings 77, Durability 92. PMBS: Cost 4, Risk 28, Mission 57, Tradability 56, Holdings 18, Durability 50.
Pillar letters and Scores for MBB, PMBS, with each pillar’s weight
PillarMBBPMBS
Cost30% weightA94HigherF4
Mission25% weightB56B57Higher
Risk15% weightD34HigherD28
Tradability15% weightA89HigherB56
Holdings10% weightA77HigherF18
Durability5% weightA92HigherC50

Rank among Mortgage-Backed Securities funds

How we build Categories ›
Same Category. Both funds are graded against the same funds, so their Grades compare head to head.

Same Category. MBB and PMBS are both graded against the same 24 Mortgage-Backed Securities funds, so their Grades compare head to head.

Mortgage-Backed Securities⁠

Category · 24 funds
See all 24 ›

MBB ranks 2nd and PMBS 20th 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. Rank 19DSCIOFirst Trust Structured Credit Income Opportunities ETFScore 34
  5. Rank 20DPMBSPIMCO Mortgage-Backed Securities Active Exchange-Traded FundScore 32
  6. Rank 21DGISCGuggenheim Securitized Income ETFScore 31

Our read on each fund

ETF.net Research

MBBAiShares MBS ETF

PMBSDPIMCO Mortgage-Backed Securities Active Exchange-Traded Fund

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.

PMBS No data

Stated mandate

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

PMBS 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.

PMBS 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.

PMBS No data

Full MBB profile⁠

Full PMBS profile⁠

MBB vs PMBS 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 PMBS Cost

Overpaying PMBS vs MBB

$15,010

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

  • MBB 0.04%

    $849

  • PMBS 0.83%

    $15,859

$10,000
30 years

Cost over time

  • MBB 0.04%
  • PMBS 0.83%
  • Overpaying
One line per fund, from year 0 to year 30. Use the arrow keys to read each point.$0$5K$10K$15K$20K051015202530PMBS $15,859MBB $849

Year by year

YearMBBPMBSOverpaying
10$73$1,474$1,401
20$288$5,581$5,293
30$849$15,859$15,010

Expense ratio

  • 0.04%MBB, cheaper
  • 0.83%PMBS
  • Middle half of Mortgage-Backed Securities funds
  • Median 0.38%

MBB 3rd cheapest of 24 funds

PMBS 23rd cheapest of 24 funds

MBB vs PMBS Dividends

Last 12 months to Oct 30, 2026
Yield (12M)
MBB 4.42%
PMBS 4.89%, better
Payout (12M)
MBB $4.07
PMBS $2.32
Last payment
MBB $0.37
PMBS $0.18
Ex-dividend
MBB Oct 1, 2026
PMBS Oct 1, 2026
Paid on
MBB Oct 6, 2026
PMBS Oct 5, 2026
Frequency
MBB Monthly
PMBS 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$0.2520232026YTD
PMBSMonthly · 24 paymentsAll PMBS payments⁠
One bar per payment. 24 payments from 2023 to 2026 YTD. Nov 1, 2024 $0.26; Dec 2, 2024 $0.15; Dec 31, 2024 $0.35; Feb 3, 2025 $0.15; Mar 3, 2025 $0.15; Apr 1, 2025 $0.18; May 1, 2025 $0.20; Jun 2, 2025 $0.20; Jul 1, 2025 $0.20; Aug 1, 2025 $0.20; Sep 2, 2025 $0.23; Oct 1, 2025 $0.22; Nov 3, 2025 $0.22; Dec 1, 2025 $0.20; Dec 31, 2025 $0.20; Feb 4, 2026 $0.20; Mar 2, 2026 $0.20; Apr 1, 2026 $0.20; May 1, 2026 $0.19; Jun 1, 2026 $0.19; Jul 1, 2026 $0.18; Aug 3, 2026 $0.18; Sep 1, 2026 $0.18; Oct 1, 2026 $0.18. Use the arrow keys to read each point.$0$0.2520232026YTD

MBB vs PMBS 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%PMBS 5.7%since Oct 2024
Return per unit of riskSharpe ratio, 3 years
MBB 0.30PMBS −0.28since Oct 2024
Worst fallMax drawdown, 5 years
MBB −16.8%PMBS −6.7%since Sep 2024
Market sensitivityBeta, 5 years
MBB 1.14PMBS 0.11

MBB and PMBS 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
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  • PMBSDvsSPMBA

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  • PMBSDvsSMBSA

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    Category
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