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

In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and SPYM +13.7%.

Which is cheaper, MBB or SPYM?

SPYM is cheaper, by 0.02 percentage points a year. That is about $2 on $10,000 held for a year. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Across categories

MBB vs SPYM: Differences, Returns & Fees

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Over the year to Oct 28, 2026, MBB returned −0.8% to SPYM's +13.7%; 0% of their weight is in the same names.

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Net assets: $35.5bn on Oct 28, 2026 for iShares MBS ETF, and $185.0bn on Oct 27, 2026 for State Street SPDR Portfolio S&P 500 ETF.

MBB on its own →SPYM on its own →

At a glance

−0.8%

MBB total return, 1 year

+13.7%

SPYM total return, 1 year

0.04%

MBB expense ratio

0.02%

SPYM expense ratio

Pair scorecard

SPYM costs 0.02 points a year less; their one-year returns differ by 14.5 points; SPYM is 5.2 times larger.

MBB vs SPYM: Differences, Returns & Fees
Measure	MBB	SPYM
Return
Measure	MBB	SPYM
Total return, 1 year	−0.8%	+13.7%
Benchmark
Measure	MBB	SPYM
What it tracks	Bloomberg U.S. MBS Index	S&P 500 Index
Cost and size
Measure	MBB	SPYM
Expense ratio	0.04%	0.02%
Net assets, as of Oct 26, 2026	$35.6bn	$183.4bn
Holdings
Measure	MBB	SPYM
Holdings in common	0%
In the S&P 500, by weight		100%
Top ten holdings, share of the fund		38.1%

Holdings in common uses holdings dated Oct 27, 2026. Method

What they share

By the books each fund has filed, MBB and SPYM hold 0% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.

50%

0 half 100%

half

0% in common

Positions both hold · largest shared weight first MBB SPYM

Only in one fund ↓

Only in MBB

BLACKROCK CASH CL INST SL AGENCY 5.45%

FHLMC 30YR UMBS SUPER 1.05%

UMBS 30YR TBA(REG A) 0.60%

GNMA2 30YR 0.59%

GNMA2 30YR 0.54%

FNMA 30YR UMBS 0.53%

GNMA2 30YR 0.53%

GNMA2 30YR 0.52%

Only in SPYM

NVIDIA CORP 7.92%

APPLE INC 7.61%

MICROSOFT CORP 5.92%

AMAZON.COM INC 3.73%

ALPHABET INC CL A 2.83%

BROADCOM INC 2.44%

ALPHABET INC CL C 2.26%

META PLATFORMS INC CLASS A 2.05%

Check overlap with more funds →

Side by side

MBB iShares MBS ETF SPYM State Street SPDR Portfolio S&P 500 ETF

Where it sits Bond ETF Stock ETF

Issuer iShares State Street

What it is Tracks an index of mortgage-backed securities Tracks the S&P 500

Total return, 1 year −0.8% +13.7%

Its benchmark over the same days −1.1% (SPMB) +13.7% (IVV)

Gap to its benchmark +0.3 pts vs SPMB 0.0 pts vs IVV

Expense ratio 0.04% 0.02%

Holdings 10813 506

Net assets, MBB as of Oct 28, 2026 and SPYM as of Oct 27, 2026 $35.5bn $185.0bn

Former ticker none SPLG

MBB and SPYM 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.

SPYM

SPYM tracks the S&P 500. Over the year to Oct 28, 2026 it returned +13.7% with distributions reinvested, against +13.7% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.02% a year. By its holdings published by its issuer for Oct 27, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 506 positions, with the top ten at 38.1%.

Questions people ask

Which returned more over the last year, MBB or SPYM?: In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and SPYM +13.7%.
Which is cheaper, MBB or SPYM?: SPYM is cheaper, by 0.02 percentage points a year. That is about $2 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

MBB vs VIG ITOT vs MBB MBB vs SCHX MBB vs QUAL SPYM vs TLT BIL vs SPYM PULS vs SPYM SPYM vs USFR

Where to next

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

Sources and dates

MBB filings on SEC EDGAR ↗

MBB prospectus with the expense ratio (SEC) ↗

iShares page for MBB ↗

SPYM filings on SEC EDGAR ↗

SPYM 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 SPYM, data as of Oct 28, 2026. https://etfiq.com/compare/any/mbb-vs-spym

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