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
43 holdings in all 2 funds| Fund | MBSD | SPMB | Positions | Holdings |
|---|---|---|---|---|
| MBSDNorthern Trust Disciplined Duration MBS ETF | — | 1% 43 shared |
482 | as of Jul 31, 2026SEC filing |
| SPMBState Street SPDR Portfolio Mortgage Backed Bond Index ETF | 1% 43 shared | — | 2,775 | as of Nov 5, 2026issuer data |
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
1.3% common weight| Holding | MBSD | SPMB | Smallest |
|---|---|---|---|
| GNMA 2%, due Dec 20, 2051 | 0.94% | 0.19% | 0.19% |
| FNMA 6.5%, due Aug 1, 2054 | 0.21% | 0.17% | 0.17% |
| FNMA 1.5%, due Oct 1, 2051 | 0.97% | 0.17% | 0.17% |
| GNMA 2.5%, due Oct 20, 2050 | 0.88% | 0.12% | 0.12% |
| GNMA 2%, due Feb 20, 2052 | 0.96% | 0.10% | 0.10% |
| GNMA 5.5%, due Dec 20, 2052 | 0.46% | 0.10% | 0.10% |
| GNMA 3%, due Nov 20, 2049 | 1.18% | 0.07% | 0.07% |
| FNMA 1.5%, due Feb 1, 2051 | 0.50% | 0.05% | 0.05% |
| FHLMC Pool 1.5%, due May 1, 2041 | 0.43% | 0.04% | 0.04% |
| GNMA 3%, due Mar 20, 2052 | 1.19% | 0.04% | 0.04% |
| GNMA 6%, due Dec 20, 2052 | 0.29% | 0.03% | 0.03% |
| GNMA 2.5%, due Mar 20, 2052 | 0.87% | 0.03% | 0.03% |
| FNMA 6.5%, due Nov 1, 2053 | 0.47% | 0.03% | 0.03% |
| FHLMC Pool 1.5%, due Feb 1, 2036 | 0.47% | 0.02% | 0.02% |
| GNMA 6.5%, due Aug 20, 2054 | 0.22% | 0.02% | 0.02% |
| GNMA 4%, due Feb 20, 2048 | 0.70% | 0.02% | 0.02% |
| FHLMC Pool 2.5%, due Apr 1, 2037 | 0.56% | 0.02% | 0.02% |
| GNMA 3.5%, due Oct 20, 2047 | 0.29% | 0.02% | 0.02% |
| FNMA 1.5%, due Jan 1, 2036 | 0.66% | 0.02% | 0.02% |
| FHLMC Pool 2%, due Feb 1, 2032 | 0.05% | 0.01% | 0.01% |
| FHLMC Pool 2%, due Jun 1, 2051 | 0.62% | 0.01% | 0.01% |
| FNMA 2.5%, due Jun 1, 2029 | 0.02% | 0.01% | 0.01% |
| FHLMC Pool 2.5%, due Jun 1, 2041 | 0.35% | 0.00% | 0.00% |
| FHLMC Pool 4%, due Oct 1, 2045 | 0.03% | 0.00% | 0.00% |
| GNMA 2.5%, due Mar 20, 2043 | 0.03% | 0.00% | 0.00% |
| FHLMC 6%, due Jul 1, 2040 | 0.07% | 0.00% | 0.00% |
| FNMA 2.5%, due Jul 1, 2030 | 0.05% | 0.00% | 0.00% |
| FNMA 2.5%, due Feb 1, 2043 | 0.03% | 0.00% | 0.00% |
| FNMA 2.5%, due May 1, 2043 | 0.01% | 0.00% | 0.00% |
| GNMA 5%, due May 20, 2048 | 0.10% | 0.00% | 0.00% |
| FHLMC Pool 4%, due Jan 1, 2046 | 0.03% | 0.00% | 0.00% |
| FNMA 2.5%, due Sep 1, 2028 | 0.01% | 0.00% | 0.00% |
| FHLMC Pool 3%, due Nov 1, 2039 | 0.09% | 0.00% | 0.00% |
| FHLMC Pool 4%, due Aug 1, 2044 | 0.01% | 0.00% | 0.00% |
| FNMA 3%, due Dec 1, 2032 | 0.87% | 0.00% | 0.00% |
| FNMA 4%, due Oct 1, 2043 | 0.07% | 0.00% | 0.00% |
| FNMA 4%, due Feb 1, 2047 | 0.01% | 0.00% | 0.00% |
| FNMA 4.5%, due Jan 1, 2042 | 0.01% | 0.00% | 0.00% |
| FNMA 4.5%, due Aug 1, 2046 | 0.01% | 0.00% | 0.00% |
| FNMA 2.5%, due Dec 1, 2027 | 0.03% | 0.00% | 0.00% |
| FNMA 4%, due Feb 1, 2047 | 0.01% | 0.00% | 0.00% |
| FHLMC 2.5%, due Jun 1, 2028 | 0.16% | 0.00% | 0.00% |
| FNMA 2%, due May 1, 2041 | 0.00% | 0.01% | 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.