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
825 holdings in all 2 funds| Fund | SPMB | VMBS | Positions | Holdings |
|---|---|---|---|---|
| SPMBState Street SPDR Portfolio Mortgage Backed Bond ETF | — | 21% 825 shared |
2,761 | as of Oct 19, 2026issuer data |
| VMBSVanguard Mortgage-Backed Securities ETF | 21% 825 shared | — | 4,906 | as of Sep 30, 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
21.2% common weight| Holding | SPMB | VMBS | Smallest |
|---|---|---|---|
| FNMA TBA 30 YR 6.5 SINGLE FAMILY MORTGAGE, due Nov 12, 2056 | 0.33% | 0.28% | 0.28% |
| GNMA II POOL MB0871 G2 01/56 FIXED 5, due Jan 20, 2056 | 0.49% | 0.28% | 0.28% |
| FED HM LN PC POOL RQ0094 FR 02/56 FIXED 5, due Feb 1, 2056 | 1.13% | 0.27% | 0.27% |
| GNMA II POOL MB1216 G2 06/56 FIXED 5, due Jun 20, 2056 | 0.41% | 0.26% | 0.26% |
| FED HM LN PC POOL RQ0118 FR 05/56 FIXED 5, due May 1, 2056 | 1.01% | 0.24% | 0.24% |
| GNMA II POOL MB1070 G2 04/56 FIXED 5, due Apr 20, 2056 | 0.31% | 0.23% | 0.23% |
| FED HM LN PC POOL RQ0056 FR 10/55 FIXED 5.5, due Oct 1, 2055 | 0.39% | 0.21% | 0.21% |
| GNMA II POOL MB1285 G2 07/56 FIXED 5.5, due Jul 20, 2056 | 0.21% | 0.21% | 0.21% |
| FED HM LN PC POOL SD8128 FR 02/51 FIXED 2, due Feb 1, 2051 | 0.28% | 0.20% | 0.20% |
| FED HM LN PC POOL SD8106 FR 11/50 FIXED 2, due Nov 1, 2050 | 0.31% | 0.18% | 0.18% |
| FNMA TBA 30 YR 6 SINGLE FAMILY MORTGAGE, due Nov 12, 2056 | 0.39% | 0.18% | 0.18% |
| GNMA II POOL MA7135 G2 01/51 FIXED 2, due Jan 20, 2051 | 0.27% | 0.18% | 0.18% |
| FED HM LN PC POOL SD8121 FR 01/51 FIXED 2, due Jan 1, 2051 | 0.34% | 0.17% | 0.17% |
| GNMA II POOL MA7826 G2 01/52 FIXED 2, due Jan 20, 2052 | 0.34% | 0.17% | 0.17% |
| FNMA POOL MA5530 FN 11/54 FIXED 5, due Nov 1, 2054 | 0.29% | 0.16% | 0.16% |
| FNMA POOL MA4378 FN 07/51 FIXED 2, due Jul 1, 2051 | 0.28% | 0.16% | 0.16% |
| FNMA POOL MA4305 FN 04/51 FIXED 2, due Apr 1, 2051 | 0.25% | 0.16% | 0.16% |
| GNMA II POOL MB1344 G2 08/56 FIXED 5.5, due Aug 20, 2056 | 0.27% | 0.16% | 0.16% |
| GNMA II POOL MA8267 G2 09/52 FIXED 4, due Sep 20, 2052 | 0.17% | 0.16% | 0.16% |
| GNMA II POOL MA8346 G2 10/52 FIXED 4, due Oct 20, 2052 | 0.21% | 0.16% | 0.16% |
| FED HM LN PC POOL SD8177 FR 11/51 FIXED 2, due Nov 1, 2051 | 0.41% | 0.15% | 0.15% |
| FNMA POOL MA4255 FN 02/51 FIXED 2, due Feb 1, 2051 | 0.25% | 0.15% | 0.15% |
| FNMA POOL MA4437 FN 10/51 FIXED 2, due Oct 1, 2051 | 0.35% | 0.15% | 0.15% |
| GNMA II POOL MB1284 G2 07/56 FIXED 5, due Jul 20, 2056 | 0.20% | 0.15% | 0.15% |
| GNMA II POOL MB0624 G2 09/55 FIXED 6, due Sep 20, 2055 | 0.16% | 0.15% | 0.15% |
| GNMA II POOL MB0146 G2 01/55 FIXED 5, due Jan 20, 2055 | 0.33% | 0.14% | 0.14% |
| GNMA II POOL MB0485 G2 07/55 FIXED 5.5, due Jul 20, 2055 | 0.30% | 0.14% | 0.14% |
| FED HM LN PC POOL SD8474 FR 11/54 FIXED 5, due Nov 1, 2054 | 0.21% | 0.14% | 0.14% |
| GNMA II POOL MA7311 G2 04/51 FIXED 2, due Apr 20, 2051 | 0.14% | 0.19% | 0.14% |
| FNMA POOL MA4325 FN 05/51 FIXED 2, due May 1, 2051 | 0.14% | 0.20% | 0.14% |
| GNMA II POOL MB0365 G2 05/55 FIXED 5, due May 20, 2055 | 0.34% | 0.13% | 0.13% |
| GNMA II POOL MB0813 G2 12/55 FIXED 5, due Dec 20, 2055 | 0.13% | 0.20% | 0.13% |
| GNMA II POOL MA9906 G2 09/54 FIXED 5.5, due Sep 20, 2054 | 0.22% | 0.13% | 0.13% |
| GNMA II POOL MA7418 G2 06/51 FIXED 2.5, due Jun 20, 2051 | 0.15% | 0.13% | 0.13% |
| GNMA II POOL MA7051 G2 12/50 FIXED 2, due Dec 20, 2050 | 0.23% | 0.13% | 0.13% |
| GNMA II POOL MB0092 G2 12/54 FIXED 5.5, due Dec 20, 2054 | 0.32% | 0.13% | 0.13% |
| FED HM LN PC POOL SD8113 FR 12/50 FIXED 2, due Dec 1, 2050 | 0.28% | 0.12% | 0.12% |
| GNMA II POOL MA7192 G2 02/51 FIXED 2, due Feb 20, 2051 | 0.20% | 0.12% | 0.12% |
| GNMA II POOL MA7649 G2 10/51 FIXED 2.5, due Oct 20, 2051 | 0.12% | 0.14% | 0.12% |
| GNMA II POOL MA7254 G2 03/51 FIXED 2, due Mar 20, 2051 | 0.16% | 0.12% | 0.12% |
| GNMA II POOL MA7827 G2 01/52 FIXED 2.5, due Jan 20, 2052 | 0.23% | 0.12% | 0.12% |
| FNMA POOL MA4511 FN 01/52 FIXED 2, due Jan 1, 2052 | 0.17% | 0.12% | 0.12% |
| FED HM LN PC POOL RQ0110 FR 04/56 FIXED 5, due Apr 1, 2056 | 0.28% | 0.12% | 0.12% |
| FNMA POOL MA5445 FN 08/54 FIXED 6, due Aug 1, 2054 | 0.30% | 0.12% | 0.12% |
| FED HM LN PC POOL SD8475 FR 11/54 FIXED 5.5, due Nov 1, 2054 | 0.53% | 0.12% | 0.12% |
| GNMA II POOL MB1143 G2 05/56 FIXED 5.5, due May 20, 2056 | 0.21% | 0.12% | 0.12% |
| GNMA II TBA 30 YR 6 JUMBOS, due Nov 19, 2056 | 0.29% | 0.11% | 0.11% |
| GNMA II POOL MA7312 G2 04/51 FIXED 2.5, due Apr 20, 2051 | 0.20% | 0.11% | 0.11% |
| GNMA II POOL MA7533 G2 08/51 FIXED 2, due Aug 20, 2051 | 0.12% | 0.11% | 0.11% |
| GNMA II POOL MA6819 G2 08/50 FIXED 2.5, due Aug 20, 2050 | 0.11% | 0.11% | 0.11% |
| GNMA II POOL MA7534 G2 08/51 FIXED 2.5, due Aug 20, 2051 | 0.24% | 0.11% | 0.11% |
| FNMA POOL MA4209 FN 12/50 FIXED 1.5, due Dec 1, 2050 | 0.17% | 0.11% | 0.11% |
| FED HM LN PC POOL SD8257 FR 10/52 FIXED 4.5, due Oct 1, 2052 | 0.18% | 0.11% | 0.11% |
| FNMA POOL MA5444 FN 08/54 FIXED 5.5, due Aug 1, 2054 | 0.13% | 0.11% | 0.11% |
| GNMA II POOL MB0424 G2 06/55 FIXED 5.5, due Jun 20, 2055 | 0.52% | 0.11% | 0.11% |
| GNMA II POOL MA8428 G2 11/52 FIXED 5, due Nov 20, 2052 | 0.11% | 0.15% | 0.11% |
| GNMA II POOL MA6930 G2 10/50 FIXED 2, due Oct 20, 2050 | 0.11% | 0.10% | 0.10% |
| GNMA II POOL MA7472 G2 07/51 FIXED 2.5, due Jul 20, 2051 | 0.12% | 0.10% | 0.10% |
| GNMA II POOL MA7052 G2 12/50 FIXED 2.5, due Dec 20, 2050 | 0.10% | 0.11% | 0.10% |
| GNMA II POOL MA8043 G2 05/52 FIXED 3, due May 20, 2052 | 0.19% | 0.10% | 0.10% |
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.