ETF Overlap Tool

Enter up to six ETFs to see how much of each is the same securities. Overlap by weight is the sum, over every holding two funds share, of the smaller of the two weights: 100% means identical portfolios, 0% means nothing in common.

Overlap by weight

66 holdings in all 2 funds

Fund	MBB	MBSD	Positions	Holdings
MBBiShares MBS ETF	—	1% 66 shared	9,098	as of Nov 6, 2026issuer data
MBSDNorthern Trust Disciplined Duration MBS ETF	1% 66 shared	—	482	as of Jul 31, 2026SEC filing

Each cell: overlap by weight, and how many positions the two funds share. Stocks, funds and bonds are compared, a bond by its own identifier and a Treasury bill by its maturity date; cash and derivatives are not, and a fund that is partly either shows how much of it is compared.

Held by both funds

1.2% common weight

Holding	MBB	MBSD	Smallest
GNMA2 30YR, due Dec 20, 2051	0.53%	0.94%	0.53%
GNMA2 30YR, due Jul 20, 2054	0.25%	0.26%	0.25%
GNMA2 30YR, due Dec 20, 2052	0.12%	0.46%	0.12%
GNMA2 30YR, due Mar 20, 2052	0.10%	0.87%	0.10%
GNMA2 30YR, due Feb 20, 2048	0.04%	0.70%	0.04%
GNMA2 30YR, due Feb 20, 2052	0.03%	0.96%	0.03%
GNMA 30YR, due Oct 20, 2047	0.02%	0.29%	0.02%
GNMA2 30YR, due Nov 20, 2049	0.01%	1.18%	0.01%
FHLMC GOLD 30YR GIANT, due Jul 1, 2040	0.01%	0.03%	0.01%
FNMA 30YR, due Feb 1, 2043	0.01%	0.08%	0.01%
FGOLD 15YR GIANT, due Feb 1, 2032	0.01%	0.75%	0.01%
GNMA2 30YR, due Jan 20, 2049	0.00%	0.23%	0.00%
FGOLD 30YR GIANT, due Sep 1, 2045	0.00%	0.01%	0.00%
FHLMC 15YR UMBS SUPER, due Apr 1, 2037	0.00%	0.56%	0.00%
GNMA2 30YR, due May 20, 2048	0.00%	0.10%	0.00%
FHLMC 30YR UMBS SUPER, due Oct 1, 2053	0.00%	0.29%	0.00%
FNMA 15YR, due Dec 1, 2032	0.00%	0.87%	0.00%
FNMA 30YR UMBS SUPER, due Feb 1, 2049	0.00%	0.06%	0.00%
FGOLD 30YR GIANT, due Feb 1, 2045	0.00%	0.06%	0.00%
FNMA 30YR, due Feb 1, 2043	0.00%	0.03%	0.00%
FNMA 30YR, due Jan 1, 2042	0.00%	0.01%	0.00%
FNMA 30YR, due Nov 1, 2045	0.00%	0.03%	0.00%
FNMA 30YR, due May 1, 2038	0.00%	0.01%	0.00%
FGOLD 15YR GIANT, due Sep 1, 2032	0.00%	0.41%	0.00%
FNMA 30YR UMBS, due Jul 1, 2049	0.00%	0.36%	0.00%
FGOLD 30YR GIANT, due Apr 1, 2043	0.00%	0.02%	0.00%
FNMA 30YR, due Feb 1, 2043	0.00%	0.02%	0.00%
FHLMC 15YR UMBS SUPER, due Oct 1, 2039	0.00%	0.81%	0.00%
GNMA2 30YR, due Dec 20, 2052	0.00%	0.79%	0.00%
FNMA 30YR, due May 1, 2047	0.00%	0.33%	0.00%
FGOLD 30YR GIANT, due Feb 1, 2038	0.00%	0.01%	0.00%
FNMA 30YR UMBS, due Jan 1, 2050	0.00%	0.47%	0.00%
FNMA 30YR UMBS SUPER, due Jul 1, 2050	0.00%	0.58%	0.00%
FNMA 30YR, due Jan 1, 2043	0.00%	0.10%	0.00%
GNMA2 30YR, due Jun 20, 2045	0.00%	0.11%	0.00%
FGOLD 30YR GIANT, due Jul 1, 2035	0.00%	0.01%	0.00%
FNMA 30YR, due May 1, 2043	0.00%	0.01%	0.00%
GNMA2 30YR, due Oct 20, 2053	0.00%	0.56%	0.00%
GNMA2 30YR PLATINUM, due Sep 20, 2038	0.00%	0.03%	0.00%
FNMA 30YR, due Nov 1, 2041	0.00%	0.04%	0.00%
GNMA2 30YR, due Mar 20, 2043	0.00%	0.03%	0.00%
FGOLD 30YR GIANT, due Mar 1, 2042	0.00%	0.01%	0.00%
FNMA 30YR, due Mar 1, 2046	0.00%	0.05%	0.00%
FNMA 30YR, due Feb 1, 2041	0.00%	0.02%	0.00%
GNMA2 30YR, due Feb 20, 2042	0.00%	0.01%	0.00%
GNMA2 30YR, due Oct 20, 2050	0.00%	0.88%	0.00%
GNMA2 30YR, due Oct 20, 2044	0.00%	0.09%	0.00%
GNMA2 30YR, due May 20, 2046	0.00%	0.28%	0.00%
GNMA 30YR, due Aug 15, 2039	0.00%	0.79%	0.00%
FNMA 15YR, due Jul 1, 2030	0.00%	0.19%	0.00%
FNMA 30YR, due Oct 1, 2044	0.00%	0.03%	0.00%
GNMA2 30YR, due Mar 20, 2036	0.00%	0.04%	0.00%
FNMA 30YR, due Aug 1, 2041	0.00%	0.03%	0.00%
FNMA 30YR, due Feb 1, 2044	0.00%	0.01%	0.00%
FHLMC GOLD 30YR, due Dec 1, 2042	0.00%	0.01%	0.00%
FNMA 30YR, due Jan 1, 2044	0.00%	0.02%	0.00%
FNMA 30YR, due Oct 1, 2046	0.00%	0.02%	0.00%
FGOLD 30YR, due Oct 1, 2035	0.00%	0.01%	0.00%
GNMA2 30YR, due Dec 20, 2045	0.00%	0.19%	0.00%
GNMA 30YR, due Sep 15, 2041	0.00%	0.43%	0.00%

Reading overlap

Two funds with 80% overlap move together and holding both mostly doubles one exposure and both fees. Low overlap is not the same as diversification: two funds can share no holdings and still be driven by the same factor. To see what a whole portfolio owns, use the portfolio x-ray.

Holdings come from each issuer's daily file where we have one and otherwise from the fund's latest SEC filing, so the two sides of a comparison can be from different dates. The table shows each fund's date.

Bond funds are matched issue by issue: two Treasury funds overlap only where they hold the same bill, note or bond. A fund of short-dated bills replaces its whole portfolio every few months, so holdings from an older filing may have matured; the table says when they have.

Fund data comes from each fund's SEC filings and issuer disclosures and is shown with the date it is as of. SEC portfolio and flow filings become public about 60 days after the period they cover. Nothing here is investment advice; see Terms.