IUSB vs IEF overlap
IUSB and IEF overlap 4.3% by weight, across 15 shared holdings.
Pick 2 to 4 ETFs.
These funds report on different dates (IUSB: July 31, 2026, IEF: May 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 | IUSB | IEF | Overlap |
|---|---|---|---|
| US Treasury N/B | 0.36% | 8.78% | 0.36% |
| US Treasury N/B | 0.35% | 8.75% | 0.35% |
| US Treasury N/BT | 0.34% | 8.71% | 0.34% |
| US Treasury N/B | 0.34% | 8.31% | 0.34% |
| US Treasury N/B | 0.34% | 8.63% | 0.34% |
| US Treasury N/BT | 0.33% | 8.22% | 0.33% |
| US Treasury N/BT | 0.33% | 9.54% | 0.33% |
| US Treasury N/B | 0.33% | 6.73% | 0.33% |
| US Treasury N/B | 0.32% | 8.53% | 0.32% |
| US Treasury N/B | 0.29% | 8.73% | 0.29% |
| US Treasury N/B | 0.27% | 5.81% | 0.27% |
| US Treasury N/B | 0.21% | 5.32% | 0.21% |
| US Treasury N/BT | 0.21% | 0.30% | 0.21% |
| US Treasury N/BT | 0.13% | 0.38% | 0.13% |
| US Treasury N/BT | 0.13% | 1.47% | 0.13% |
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: IUSB, SEC Form N-PORT, July 31, 2026; IEF, SEC Form N-PORT, May 31, 2026.
Largest institutions holding both
| Firm | IUSB | IEF |
|---|---|---|
| Fisher Asset Management, LLC | $306K | $15.2B |
| Envestnet Asset Management Inc. | $8.3B | $1.5B |
| JPMorgan Chase & Co | $1.0B | $3.3B |
| BlackRock, Inc. | $3.8B | $370.5M |
| Jones Financial Companies LLLP | $4.1B | $16.3M |
| LPL Financial LLC | $2.9B | $577.7M |
| Morgan Stanley | $1.4B | $1.4B |
| Wells Fargo & Company | $2.3B | $303.0M |
| Ameriprise Financial Inc. | $601.3M | $1.8B |
| FMR LLC | $67.6M | $2.3B |
| Bank of America Corp. | $211.6M | $2.0B |
| Northwestern Mutual Wealth Management Co | $1.5B | $479.3M |
| Mariner, LLC | $957.3M | $22.2M |
| Raymond James Financial Inc. | $247.2M | $713.5M |
| PNC Financial Services Group, Inc. | $67.7M | $826.0M |
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: IUSB institutional holders, IEF institutional holders.
Frequently asked questions
How much do IUSB and IEF overlap?
4.3% by weight, with 15 holdings in common, using holdings for IUSB as of July 31, 2026 and IEF as of May 31, 2026. The largest shared position is US TREASURY N/B.
Do institutions hold both IUSB and IEF?
433 Form 13F filers report positions in both, out of 1,566 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%.