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

In the year to Oct 9, 2026, with distributions reinvested, JMBS returned −1.8% and MBB −1.2%.

Which is cheaper, JMBS or MBB?

MBB is cheaper, by 0.17 percentage points a year. That is about $17 on $10,000 held for a year. Fees come from each fund's prospectus.

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JMBS vs MBB: Differences, Returns & Fees

JMBS's duration was 6.2 years on Jul 31, 2026 and MBB's 5.4 on May 31, 2026; MBB charges 0.04% to JMBS's 0.21%. Net assets: $6.7bn on Jul 31, 2026 for Janus Henderson Mortgage-Backed Securities ETF, and $35.6bn on Oct 9, 2026 for iShares MBS ETF.

MBB costs 0.17 points a year less; their one-year returns differ by 0.6 points; MBB is 5.8 times larger.

	JMBS	MBB
Expense ratio	0.21%	0.04%
Net assets, as of Jul 31, 2026	$6.7bn	$38.9bn
Total return, 1 year	−1.8%	−1.2%
What it tracks	No index, actively managed	Bloomberg U.S. MBS Index
Holdings in common	0%
Below its high	5.4%, high on Feb 27, 2026	4.6%, high on Feb 27, 2026

Holdings in common uses holdings dated May 31, 2026 and Jul 31, 2026.

−1.8%

JMBS total return, 1 year

−1.2%

MBB total return, 1 year

0.21%

JMBS expense ratio

0.04%

MBB expense ratio

What they hold in common

By the books each fund has filed, JMBS and MBB hold 0% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated May 31, 2026 and Jul 31, 2026.

50%

half

0% in common

Positions both hold, largest shared weight first

Holding JMBS MBB

Fannie Mae Pool UMBS, 30 Year, due Nov 1, 2048 0.02% 0.04%

Fannie Mae Pool UMBS, 30 Year, due Oct 1, 2051 0.29% 0.01%

Fannie Mae Pool UMBS, 30 Year, due Oct 1, 2047 0.02% 0.01%

Ginnie Mae II Pool, 30 Year, due Jun 20, 2048 0.01% 0.02%

Ginnie Mae II Pool, 30 Year, due Feb 20, 2048 0.01% 0.01%

Ginnie Mae II Pool, 30 Year, due May 20, 2048 0.00% 0.00%

Fannie Mae Pool UMBS, 30 Year, due Mar 1, 2051 1.39% 0.00%

Fannie Mae Pool UMBS, 30 Year, due Jan 1, 2051 0.05% 0.00%

Fannie Mae Pool UMBS, 30 Year, due Oct 1, 2051 1.47% 0.00%

Fannie Mae Pool UMBS, 30 Year, due Jul 1, 2046 0.01% 0.00%

Fannie Mae Pool UMBS, 30 Year, due Jul 1, 2048 0.02% 0.00%

Fannie Mae Pool UMBS, 15 Year, due Feb 1, 2032 0.00% 0.01%

Only in JMBS

Fannie Mae / Freddie Mac UMBS, Single Family, 30 Year, due Aug 25, 2056 16.97%

Ginnie Mae II UMBS, Single Family, 30 Year, due Aug 15, 2056 8.87%

Fannie Mae / Freddie Mac UMBS, Single Family, 30 Year, due Aug 25, 2056 7.55%

Fannie Mae Pool UMBS, 30 Year, due Sep 1, 2053 4.59%

Fannie Mae / Freddie Mac UMBS, Single Family, 30 Year, due Aug 25, 2056 4.21%

Fannie Mae / Freddie Mac UMBS, Single Family, 30 Year, due Aug 25, 2056 3.82%

Fannie Mae / Freddie Mac UMBS, Single Family, 30 Year, due Aug 25, 2056 3.66%

Ginnie Mae II UMBS, Single Family, 30 Year, due Aug 15, 2056 2.87%

Only in MBB

Freddie Mac Pool, due May 1, 2051 1.05%

Ginnie Mae, due Jun 20, 2056 0.95%

Uniform Mortgage-Backed Security, TBA, due Jun 1, 2056 0.83%

Ginnie Mae, due Jun 20, 2056 0.67%

Uniform Mortgage-Backed Security, TBA, due Jun 1, 2056 0.64%

Ginnie Mae II Pool, due Nov 20, 2054 0.55%

Ginnie Mae II Pool, due Oct 20, 2051 0.54%

Ginnie Mae II Pool, due Dec 20, 2051 0.53%

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On the same fields

JMBS

Janus Henderson Mortgage-Backed Securities ETF

MBB

iShares MBS ETF

Where it sits Bond ETF Bond ETF

Issuer Janus Henderson iShares

What it is Actively managed Tracks an index of mortgage-backed securities

Total return, 1 year −1.8% −1.2%

S&P 500 over the same days +17.3% +17.3%

Gap to the S&P 500 −19.1 pts −18.5 pts

Expense ratio 0.21% 0.04%

Holdings 618 10855

Net assets, JMBS as of Jul 31, 2026 and MBB as of Oct 9, 2026 $6.7bn $35.6bn

JMBS and MBB on the fields both publish, as of Oct 9, 2026. Source: ETFIQ.

JMBS in plain words

JMBS is actively managed and tracks no index. The prospectus expense ratio is 0.21% a year. It sat 5.4% below its high of Feb 27, 2026 on Oct 9, 2026.

Over the year to Oct 9, 2026 it returned −1.8% with distributions reinvested, against −1.6% for its benchmark, the Bloomberg U.S. Aggregate Bond Index.

MBB in plain words

MBB tracks an index of mortgage-backed securities. The prospectus expense ratio is 0.04% a year. It sat 4.6% below its high of Feb 27, 2026 on Oct 9, 2026.

Over the year to Oct 9, 2026 it returned −1.2% with distributions reinvested, against −1.4% for its benchmark, the Bloomberg U.S. MBS Index.

Questions people ask

Which returned more over the last year, JMBS or MBB?: In the year to Oct 9, 2026, with distributions reinvested, JMBS returned −1.8% and MBB −1.2%.
Which is cheaper, JMBS or MBB?: MBB is cheaper, by 0.17 percentage points a year. That is about $17 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

JMBS vs JMTG JMBS vs VMBS JMBS vs SPMB JMBS vs SMBS MBB vs SMBS MBB vs PMBS JMTG vs MBB MBB vs SPMB

JMBS on its own →MBB on its own →Hold both: look the portfolio through →Rankings →Standards and sources →

Where these figures came from

JMBS filings on SEC EDGAR ↗JMBS prospectus with the expense ratio (SEC) ↗Janus Henderson website ↗MBB filings on SEC EDGAR ↗MBB prospectus with the expense ratio (SEC) ↗iShares page for MBB ↗

ETFIQ links to the documents behind every figure; a link is not an endorsement. 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, JMBS against MBB, data as of Oct 9, 2026. https://etfiq.com/compare/any/jmbs-vs-mbb

Open data

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