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

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

Which is cheaper, FSEC or MBB?

MBB is cheaper, by 0.32 percentage points a year. That is about $32 on $10,000 held for a year. Fees come from each fund's prospectus.

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FSEC vs MBB: Differences, Returns & Fees

On May 31, 2026 FSEC's duration was 5.2 years and MBB's 5.4; MBB charges 0.04% to FSEC's 0.36%. Net assets: $4.5bn on Sep 30, 2026 for Fidelity Investment Grade Securitized ETF, and $35.6bn on Oct 9, 2026 for iShares MBS ETF.

MBB costs 0.32 points a year less; both returned −1.2% over a year; MBB is 8.1 times larger.

	FSEC	MBB
Expense ratio	0.36%	0.04%
Net assets, as of Sep 30, 2026	$4.5bn	$36.2bn
Total return, 1 year	−1.2%	−1.2%
What it tracks	No index, actively managed	Bloomberg U.S. MBS Index
Holdings in common	6%
Below its high	4.4%, high on Feb 27, 2026	4.6%, high on Feb 27, 2026

Holdings in common uses holdings dated May 31, 2026.

−1.2%

FSEC total return, 1 year

−1.2%

MBB total return, 1 year

0.36%

FSEC expense ratio

0.04%

MBB expense ratio

What they hold in common

By the books each fund has filed, FSEC and MBB hold 6% 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.

50%

half

6% in common

Positions both hold, largest shared weight first

Holding FSEC MBB

GNII II 5.5% 06/01/2056 #TBA, due Jun 1, 2056 6.97% 0.95%

GNII II 5% 06/01/2056 #TBA, due Jun 1, 2056 4.20% 0.67%

UMBS 30YR 5% 06/01/2056 #TBA, due Jun 1, 2056 5.97% 0.64%

GNII II 6% 06/01/2056 #TBA, due Jun 1, 2056 3.02% 0.46%

UMBS 30YR 6% 06/01/2056 #TBA, due Jun 1, 2056 0.55% 0.34%

FHLG 30YR 2% 03/01/2051#SD8134, due Mar 1, 2051 0.18% 0.22%

UMBS 30YR 5.5% 06/01/2056 #TBA, due Jun 1, 2056 0.16% 0.83%

GNII II 4.5% 11/20/2054#MB0024, due Nov 20, 2054 0.70% 0.15%

GNII II 3% 05/20/2052#MA8043, due May 20, 2052 0.73% 0.12%

FNMA 30YR 2% 03/01/2051#MA4281, due Mar 1, 2051 0.12% 0.33%

FNMA 30YR 2% 07/01/2051#FS4654, due Jul 1, 2051 0.11% 0.44%

FNMA 30YR 2% 07/01/2050#MA4077, due Jul 1, 2050 0.20% 0.10%

Only in FSEC

GNII II 5.5% 07/01/2056 #TBA, due Jul 1, 2056 4.64%

GNII II 2% 06/01/2056 #TBA, due Jun 1, 2056 3.04%

GNII II 2.5% 06/01/2056 #TBA, due Jun 1, 2056 2.90%

UMBS 30YR 2% 07/01/2056 #TBA, due Jul 1, 2056 2.52%

GNII II 6% 07/01/2056 #TBA, due Jul 1, 2056 1.99%

FHLG 30YR 2.5% 11/01/2051#SD7548, due Nov 1, 2051 1.55%

GNII II 5% 07/01/2056 #TBA, due Jul 1, 2056 1.51%

FEDERAL NAT MTG ASN GTD REM PA 21-13 BE 1.25% 02/25/2050, due Feb 25, 2050 1.30%

Only in MBB

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

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

Fannie Mae Pool, due Dec 1, 2051 0.52%

Fannie Mae Pool, due Nov 1, 2051 0.44%

Ginnie Mae II Pool, due Sep 20, 2053 0.41%

Ginnie Mae II Pool, due Mar 20, 2052 0.36%

Ginnie Mae II Pool, due May 20, 2051 0.35%

Fannie Mae Pool, due Apr 1, 2052 0.33%

Check overlap with more funds →

On the same fields

FSEC

Fidelity Investment Grade Securitized ETF

MBB

iShares MBS ETF

Where it sits Bond ETF Bond ETF

Issuer Fidelity iShares

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

Total return, 1 year −1.2% −1.2%

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

Gap to the S&P 500 −18.4 pts −18.5 pts

Expense ratio 0.36% 0.04%

Holdings 1059 10855

Net assets, FSEC as of Sep 30, 2026 and MBB as of Oct 9, 2026 $4.5bn $35.6bn

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

FSEC in plain words

FSEC is actively managed and tracks no index. Over the year to Oct 9, 2026 it returned −1.2% with distributions reinvested. The prospectus expense ratio is 0.36% a year. It sat 4.4% below its high of Feb 27, 2026 on Oct 9, 2026.

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, FSEC or MBB?: In the year to Oct 9, 2026, with distributions reinvested, FSEC returned −1.2% and MBB −1.2%.
Which is cheaper, FSEC or MBB?: MBB is cheaper, by 0.32 percentage points a year. That is about $32 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

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

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

Where these figures came from

FSEC filings on SEC EDGAR ↗FSEC prospectus with the expense ratio (SEC) ↗Fidelity 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, FSEC against MBB, data as of Oct 9, 2026. https://etfiq.com/compare/any/fsec-vs-mbb

Open data

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