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
89 holdings in all 2 funds| Fund | FSEC | MBB | Positions | Holdings |
|---|---|---|---|---|
| FSECFidelity Investment Grade Securitized ETF | — | 5% 89 shared |
1,146 | as of Oct 20, 2026issuer data |
| MBBiShares MBS ETF | 5% 89 shared | — | 9,127 | as of Oct 20, 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
4.8% common weight| Holding | FSEC | MBB | Smallest |
|---|---|---|---|
| GNII II 6% 11/56 #TBA, due Nov 1, 2056 | 3.11% | 0.62% | 0.62% |
| GNII II 5.5% 11/56 #TBA, due Nov 1, 2056 | 4.99% | 0.53% | 0.53% |
| UMBS 30YR 5% 11/56 #TBA, due Nov 1, 2056 | 3.32% | 0.35% | 0.35% |
| GNII II 2% 01/52#MA7826, due Jan 20, 2052 | 0.70% | 0.33% | 0.33% |
| UMBS 30YR 2% 11/56 #TBA, due Nov 1, 2056 | 1.06% | 0.22% | 0.22% |
| UMBS 30YR 2.5% 11/56 #TBA, due Nov 1, 2056 | 0.27% | 0.16% | 0.16% |
| GNII II 4.5% 11/54#MB0024, due Nov 20, 2054 | 0.62% | 0.15% | 0.15% |
| GNII II 3% 05/52#MA8043, due May 20, 2052 | 0.65% | 0.12% | 0.12% |
| UMBS 30YR 3% 11/56 #TBA, due Nov 1, 2056 | 0.51% | 0.12% | 0.12% |
| UMBS 30YR 4.5% 11/56 #TBA, due Nov 1, 2056 | 0.18% | 0.11% | 0.11% |
| FNMA 30YR 2% 03/51#MA4281, due Mar 1, 2051 | 0.11% | 0.29% | 0.11% |
| GNII II 2.5% 05/52#MA8042, due May 20, 2052 | 0.82% | 0.11% | 0.11% |
| FNMA 30YR 2% 04/51#MA4305, due Apr 1, 2051 | 0.10% | 0.30% | 0.10% |
| FNMA 30YR 2% 07/50#MA4077, due Jul 1, 2050 | 0.18% | 0.10% | 0.10% |
| FHLG 30YR 4.5% 09/52#SD8245, due Sep 1, 2052 | 0.34% | 0.10% | 0.10% |
| FHLG 30YR 6% 09/54#SD7574, due Sep 1, 2054 | 0.13% | 0.08% | 0.08% |
| FNMA 30YR 2.5% 12/51#FM9732, due Dec 1, 2051 | 0.07% | 0.07% | 0.07% |
| FNMA 30YR 2% 05/51#MA4325, due May 1, 2051 | 0.07% | 0.12% | 0.07% |
| GNII II 2% 07/51#MA7471, due Jul 20, 2051 | 0.86% | 0.07% | 0.07% |
| FNMA 30YR 2% 04/51#FM6834, due Apr 1, 2051 | 0.06% | 0.12% | 0.06% |
| GNII II 3% 11/46#MA4126, due Dec 20, 2046 | 0.15% | 0.06% | 0.06% |
| GNII II 2% 08/50#MA6818, due Aug 20, 2050 | 0.06% | 0.05% | 0.05% |
| FNMA 30YR 2% 01/51#MA4237, due Jan 1, 2051 | 0.18% | 0.05% | 0.05% |
| GNMA II 3.5% 10/52#MA8345, due Oct 20, 2052 | 0.05% | 0.06% | 0.05% |
| UMBS 30YR 3.5% 11/56 #TBA, due Nov 1, 2056 | 1.69% | 0.05% | 0.05% |
| FHLG 30YR 5.5% 09/53#SD7565, due Sep 1, 2053 | 0.08% | 0.05% | 0.05% |
| FNMA 30YR 3% 11/51#FS9709, due Nov 1, 2051 | 0.09% | 0.05% | 0.05% |
| GNII II 3% 07/51#MA7473, due Jul 20, 2051 | 0.05% | 0.10% | 0.05% |
| FHLG 30YR 2% 09/50#SD8090, due Sep 1, 2050 | 0.25% | 0.04% | 0.04% |
| FNMA 30YR 2% 04/52#FS8195, due Apr 1, 2052 | 0.22% | 0.04% | 0.04% |
| FHLG 30YR 2% 05/51#SD8146, due May 1, 2051 | 0.04% | 1.05% | 0.04% |
| FHLG 30YR 4.5%12/52#SD7557, due Dec 1, 2052 | 0.28% | 0.04% | 0.04% |
| UMBS 30YR 4% 11/56 #TBA, due Nov 1, 2056 | 0.28% | 0.04% | 0.04% |
| GNII II 3% 06/51#MA7419, due Jun 20, 2051 | 0.04% | 0.07% | 0.04% |
| GNII II 2% 10/50#MA6930, due Oct 20, 2050 | 0.14% | 0.03% | 0.03% |
| GNII II 2.5% 06/51#MA7418, due Jun 20, 2051 | 0.03% | 0.10% | 0.03% |
| FHLG 30YR 4% 02/53#SD7561, due Feb 1, 2053 | 0.03% | 0.04% | 0.03% |
| FHLG 30YR 2.5% 08/50#SD7523, due Aug 1, 2050 | 0.05% | 0.03% | 0.03% |
| FHLG 30YR 2% 06/50#SD8080, due Jun 1, 2050 | 0.41% | 0.03% | 0.03% |
| GNII II 3% 05/51#MA7368, due May 20, 2051 | 0.14% | 0.03% | 0.03% |
| FNMA 30YR 2.5% 04/52#FS5385, due Apr 1, 2052 | 0.07% | 0.03% | 0.03% |
| GNII II 5% 11/54#MB0025, due Nov 20, 2054 | 0.03% | 0.59% | 0.03% |
| GNII II 3% 08/51#MA7535, due Aug 20, 2051 | 0.06% | 0.03% | 0.03% |
| FHLG 30YR 5.5% 09/54#RJ2412, due Sep 1, 2054 | 0.07% | 0.03% | 0.03% |
| FNMA 30YR 2.5% 01/52#FS8108, due Jan 1, 2052 | 0.08% | 0.02% | 0.02% |
| FNMA 30YR 2% 12/50#MA4208, due Dec 1, 2050 | 0.02% | 0.12% | 0.02% |
| FHLG 30YR 3.5% 02/52#SD0865, due Feb 1, 2052 | 0.02% | 0.02% | 0.02% |
| GNII II 5.5% 12/54#MB0092, due Dec 20, 2054 | 0.04% | 0.02% | 0.02% |
| UMBS 30YR 6.5% 11/56 #TBA, due Nov 1, 2056 | 0.02% | 0.13% | 0.02% |
| FHLG 30YR 5.5% 10/54#SD8469, due Oct 1, 2054 | 0.02% | 0.12% | 0.02% |
| FHLG 30YR 2% 05/51#SD7541, due May 1, 2051 | 0.01% | 0.02% | 0.01% |
| GNII II 3% 03/50#MA6541, due Mar 20, 2050 | 0.02% | 0.01% | 0.01% |
| FHLG 30YR 2.5% 10/50#SD7525, due Oct 1, 2050 | 0.08% | 0.01% | 0.01% |
| GNMA II 3.5% 09/52#MA8266, due Sep 20, 2052 | 0.12% | 0.01% | 0.01% |
| FHLG 30YR 2% 11/50#SD8106, due Nov 1, 2050 | 0.77% | 0.01% | 0.01% |
| FNMA 30YR 3.5% 11/48#FS5059, due Nov 1, 2048 | 0.01% | 0.02% | 0.01% |
| FHLG 30YR 2% 06/52#SD4958, due Jun 1, 2052 | 0.01% | 0.16% | 0.01% |
| FNMA 15YR 2.5% 12/36#FS4058, due Dec 1, 2036 | 0.14% | 0.01% | 0.01% |
| GNII II 2% 09/50#MA6864, due Sep 20, 2050 | 0.13% | 0.01% | 0.01% |
| FNMA 15YR 4.5% 02/41#MA5977, due Feb 1, 2041 | 0.01% | 0.01% | 0.01% |
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.