Which returned more over the last year, MBB or SPSB?

In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and SPSB +2.2%.

Which is cheaper, MBB or SPSB?

Neither: MBB and SPSB both charge 0.04% a year. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Across categories

MBB vs SPSB: Differences, Returns & Fees

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MBB's duration was 5.7 years on Aug 31, 2026 and SPSB's 1.8 on Jun 30, 2026; both charge 0.04%.

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Net assets: $35.5bn on Oct 28, 2026 for iShares MBS ETF, and $11.3bn on Oct 27, 2026 for State Street SPDR Portfolio Short Term Corporate Bond ETF.

MBB on its own →SPSB on its own →

At a glance

−0.8%

MBB total return, 1 year

+2.2%

SPSB total return, 1 year

0.04%

MBB expense ratio

0.04%

SPSB expense ratio

Pair scorecard

Both cost 0.04% a year; their one-year returns differ by 3.0 points; MBB is 3.2 times larger.

Points (pts) are percentage points.

MBB vs SPSB: Differences, Returns & Fees
Measure	MBB	SPSB
Return
Measure	MBB	SPSB
Total return, 1 year	−0.8%	+2.2%
Benchmark
Measure	MBB	SPSB
What it tracks	Bloomberg U.S. MBS Index	Bloomberg U.S. 1-3 Year Corporate Bond Index
Cost and size
Measure	MBB	SPSB
Expense ratio	0.04%	0.04%
Net assets, as of Oct 26, 2026	$35.6bn	$11.2bn
Holdings
Measure	MBB	SPSB
Holdings in common	0%

Holdings in common uses holdings dated Jun 30, 2026 and Aug 31, 2026. Method

What they share

By the books each fund has filed, MBB and SPSB hold 0% of their money in the same securities at the same weight. Holdings dated Jun 30, 2026 and Aug 31, 2026.

50%

0 half 100%

half

0% in common

Positions both hold · largest shared weight first MBB SPSB

Only in one fund ↓

Only in MBB

Ginnie Mae, due Sep 1, 2056 1.05%

Freddie Mac Pool, due May 1, 2051 0.98%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.85%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.70%

Ginnie Mae, due Sep 1, 2056 0.53%

Ginnie Mae II Pool, due Nov 20, 2054 0.51%

Ginnie Mae II Pool, due Oct 20, 2051 0.51%

Ginnie Mae II Pool, due Dec 20, 2051 0.50%

Only in SPSB

Salesforce Inc, due Mar 15, 2029 0.56%

AerCap Ireland Capital DAC / AerCap Global Aviation Trust, due Oct 29, 2028 0.44%

Bank of America Corp, due Dec 20, 2028 0.42%

Citigroup Inc, due Mar 4, 2029 0.42%

Morgan Stanley, due Apr 10, 2030 0.38%

JPMorgan Chase & Co, due Jul 25, 2028 0.38%

Pfizer Investment Enterprises Pte Ltd, due May 19, 2028 0.37%

Sprint Capital Corp, due Nov 15, 2028 0.37%

Check overlap with more funds →

Side by side

MBB iShares MBS ETF SPSB State Street SPDR Portfolio Short Term Corporate Bond ETF

Where it sits Bond ETF Bond ETF

Issuer iShares State Street

What it is Tracks an index of mortgage-backed securities Tracks an index of Short Term Corporate Bond

Total return, 1 year −0.8% +2.2%

Its benchmark over the same days −1.1% (SPMB) −1.4% (AGG)

Gap to its benchmark +0.3 pts vs SPMB +3.6 pts vs AGG

Expense ratio 0.04% 0.04%

Holdings 10813 1684

Net assets, MBB as of Oct 28, 2026 and SPSB as of Oct 27, 2026 $35.5bn $11.3bn

MBB and SPSB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.

Alert

About each fund

MBB

MBB tracks an index of mortgage-backed securities. Over the year to Oct 28, 2026 it returned −0.8% with distributions reinvested, against −1.1% for its benchmark, the Bloomberg U.S. MBS Index. The prospectus expense ratio is 0.04% a year.

SPSB

SPSB tracks an index of Short Term Corporate Bond. Over the year to Oct 28, 2026 it returned +2.2% with distributions reinvested, against −1.4% for its benchmark, the Bloomberg U.S. Aggregate Bond Index.

Questions people ask

Which returned more over the last year, MBB or SPSB?: In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and SPSB +2.2%.
Which is cheaper, MBB or SPSB?: Neither: MBB and SPSB both charge 0.04% a year. Fees come from each fund's prospectus.

Other comparisons

MBB vs VCSH IGSB vs MBB BSV vs MBB MBB vs PFF SPSB vs TLT SPSB vs VTIP SPSB vs USFR SCHP vs SPSB

Where to next

MBB on its own →SPSB on its own →Hold both: look the portfolio through →Rankings →MBB dividend history →MBB holdings →SPSB dividend history →SPSB holdings →Standards and sources →

Sources and dates

MBB filings on SEC EDGAR ↗

MBB prospectus with the expense ratio (SEC) ↗

iShares page for MBB ↗

SPSB filings on SEC EDGAR ↗

SPSB prospectus with the expense ratio (SEC) ↗

State Street website ↗

Links are sources, not endorsements. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

Cite this pageCitation, APA and Markdown

ETFIQ, MBB against SPSB, data as of Oct 28, 2026. https://etfiq.com/compare/any/mbb-vs-spsb

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Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.