SMBS vs JMBS overlap
SMBS and JMBS overlap 0.2% by weight, across 11 shared holdings.
Pick 2 to 4 ETFs.
These funds report on different dates (SMBS: May 31, 2026, JMBS: July 31, 2026), so market moves and index changes between those dates lower the number. Funds tracking the same index can read well below their true overlap.
Top shared holdings
| Holding | SMBS | JMBS | Overlap |
|---|---|---|---|
| FN Fm4129 | 0.09% | 0.09% | 0.09% |
| FN Ma3521 | 0.01% | 0.02% | 0.01% |
| FN Ma3415 | 0.01% | 0.02% | 0.01% |
| FN Fm4738 | 0.01% | 0.21% | 0.01% |
| Fannie Mae Pool | 0.04% | 0.01% | 0.01% |
| FN Ma4026 | 0.01% | 0.04% | 0.01% |
| Fannie Mae Pool | 0.01% | 0.01% | 0.01% |
| FN Cb2681 | 0.01% | 0.02% | 0.01% |
| FN Ma3149 | 0.00% | 0.02% | 0.00% |
| G2 Ma5192 | 0.01% | 0.00% | 0.00% |
| FN Ma4056 | 0.00% | 0.04% | 0.00% |
Overlap by weight adds up the smaller weight of each holding the funds share, so 100% means identical portfolios. Long securities only: derivatives and cash vehicles are left out. Sources: SMBS, SEC Form N-PORT, May 31, 2026; JMBS, SEC Form N-PORT, July 31, 2026.
Largest institutions holding both
| Firm | SMBS | JMBS |
|---|---|---|
| Charles Schwab Investment Management Inc. | $6.2B | $1.0B |
| Morgan Stanley | $230K | $1.4B |
| Bank of America Corp. | $667K | $444.9M |
| Raymond James Financial Inc. | $289K | $153.4M |
| Osaic Holdings, Inc. | $131K | $151.3M |
| Corient Private Wealth LP | $357K | $149.5M |
| Focus Partners Wealth | $454K | $127.2M |
| UBS Group AG | $2K | $116.9M |
| Royal Bank of Canada | $282K | $89.5M |
| LPL Financial LLC | $1.0M | $83.1M |
| Wells Fargo & Company | $97K | $82.6M |
| Cetera Investment Advisers | $393K | $27.3M |
| Rockefeller Capital Management L.P. | $26 | $22.6M |
| Citadel Advisors LLC | $4.1M | $15.9M |
| Parallel Advisors, LLC | $50K | $15.8M |
This compares who owns the funds, not what the funds hold. From SEC Form 13F, for managers with $100M+ in US securities.
Who owns them: SMBS institutional holders, JMBS institutional holders.
Frequently asked questions
How much do SMBS and JMBS overlap?
0.2% by weight, with 11 holdings in common, using holdings for SMBS as of May 31, 2026 and JMBS as of July 31, 2026. The largest shared position is FN FM4129.
Do institutions hold both SMBS and JMBS?
41 Form 13F filers report positions in both, out of 311 that report either one.
How is overlap by weight worked out?
For each holding the two funds share, take the smaller of the two weights, then add those up. Identical portfolios score 100%.