# Portfolio overlap — FUBFX vs IUSB

Comparing **Fidelity U.S. Bond Index Fund** (2026-02-28) and **iShares Core Universal USD Bond ETF** (2026-01-31).

- Shared positions: 3259
- Fidelity U.S. Bond Index Fund covered by iShares Core Universal USD Bond ETF: 0.3361703371538646869800195296
- iShares Core Universal USD Bond ETF covered by Fidelity U.S. Bond Index Fund: 0.3361703371538646869800195294

## Fidelity U.S. Bond Index Fund — top positions

| Security | Weight | Shared |
|----------|--------|--------|
| US TREASURY N/B | 0.009120 |  |
| US TREASURY N/B | 0.008514 | ✓ |
| US TREASURY N/B | 0.008158 | ✓ |
| Fidelity Cash Central Fund | 0.008064 |  |
| US TREASURY N/B | 0.008010 | ✓ |
| US TREASURY N/B | 0.007134 | ✓ |
| US TREASURY N/B | 0.007075 | ✓ |
| FR SD8121 | 0.006361 |  |
| US TREASURY N/B | 0.006213 | ✓ |
| US TREASURY N/B | 0.005773 | ✓ |
| US TREASURY N/B | 0.005758 | ✓ |
| US TREASURY N/B | 0.005756 | ✓ |
| US TREASURY N/B | 0.005560 | ✓ |
| US TREASURY N/B | 0.005290 | ✓ |
| US TREASURY N/B | 0.005183 | ✓ |
| Fidelity Securities Lending Cash Central Fund | 0.004969 |  |
| US TREASURY N/B | 0.004808 | ✓ |
| US TREASURY N/B | 0.004701 | ✓ |
| US TREASURY N/B | 0.004599 | ✓ |
| US TREASURY N/B | 0.004561 | ✓ |
| US TREASURY N/B | 0.004423 | ✓ |
| US TREASURY N/B | 0.004406 | ✓ |
| US TREASURY N/B | 0.004401 | ✓ |
| US TREASURY N/B | 0.004368 | ✓ |
| US TREASURY N/B | 0.004363 | ✓ |
| US TREASURY N/B | 0.004352 |  |
| US TREASURY N/B | 0.004351 | ✓ |
| US TREASURY N/B | 0.004229 | ✓ |
| US TREASURY N/B | 0.004097 | ✓ |
| FN MA4325 | 0.003869 | ✓ |
| US TREASURY N/B | 0.003867 | ✓ |
| US TREASURY N/B | 0.003849 | ✓ |
| US TREASURY N/B | 0.003815 | ✓ |
| US TREASURY N/B | 0.003774 | ✓ |
| US TREASURY N/B | 0.003721 | ✓ |
| US TREASURY N/B | 0.003697 | ✓ |
| US TREASURY N/B | 0.003684 | ✓ |
| US TREASURY N/B | 0.003658 | ✓ |
| US TREASURY N/B | 0.003624 | ✓ |
| US TREASURY N/B | 0.003524 | ✓ |
| US TREASURY N/B | 0.003515 | ✓ |
| US TREASURY N/B | 0.003507 | ✓ |
| US TREASURY N/B | 0.003500 | ✓ |
| FN MA4255 | 0.003493 |  |
| US TREASURY N/B | 0.003479 | ✓ |
| US TREASURY N/B | 0.003462 | ✓ |
| US TREASURY N/B | 0.003446 | ✓ |
| US TREASURY N/B | 0.003405 | ✓ |
| US TREASURY N/B | 0.003387 | ✓ |
| US TREASURY N/B | 0.003349 |  |

## iShares Core Universal USD Bond ETF — top positions

| Security | Weight | Shared |
|----------|--------|--------|
| Blackrock Liquidity TempCash Inst | 0.023010 |  |
| BlackRock Cash Funds: Treasury, SL Agency Shares | 0.007770 |  |
| US TREASURY N/B | 0.003831 | ✓ |
| US TREASURY N/B | 0.003785 | ✓ |
| US TREASURY N/B | 0.003777 | ✓ |
| US TREASURY N/B | 0.003775 | ✓ |
| US TREASURY N/B | 0.003711 | ✓ |
| US TREASURY N/B | 0.003708 | ✓ |
| US TREASURY N/B | 0.003548 | ✓ |
| US TREASURY N/B | 0.003495 | ✓ |
| US TREASURY N/B | 0.003432 |  |
| US TREASURY N/B | 0.003366 | ✓ |
| FN MA4018 | 0.003335 |  |
| US TREASURY N/B | 0.003275 | ✓ |
| US TREASURY N/B | 0.003210 |  |
| US TREASURY N/B | 0.003197 | ✓ |
| US TREASURY N/B | 0.003052 | ✓ |
| US TREASURY N/B | 0.002966 | ✓ |
| US TREASURY N/B | 0.002932 | ✓ |
| US TREASURY N/B | 0.002756 | ✓ |
| US TREASURY N/B | 0.002756 | ✓ |
| US TREASURY N/B | 0.002717 | ✓ |
| US TREASURY N/B | 0.002668 | ✓ |
| US TREASURY N/B | 0.002655 |  |
| US TREASURY N/B | 0.002640 | ✓ |
| US TREASURY N/B | 0.002620 |  |
| US TREASURY N/B | 0.002614 | ✓ |
| US TREASURY N/B | 0.002590 |  |
| US TREASURY N/B | 0.002588 |  |
| US TREASURY N/B | 0.002547 |  |
| US TREASURY N/B | 0.002547 |  |
| US TREASURY N/B | 0.002473 | ✓ |
| US TREASURY N/B | 0.002452 |  |
| US TREASURY N/B | 0.002428 | ✓ |
| US TREASURY N/B | 0.002422 | ✓ |
| US TREASURY N/B | 0.002419 |  |
| US TREASURY N/B | 0.002404 | ✓ |
| US TREASURY N/B | 0.002394 |  |
| US TREASURY N/B | 0.002390 | ✓ |
| US TREASURY N/B | 0.002343 | ✓ |
| US TREASURY N/B | 0.002333 | ✓ |
| US TREASURY N/B | 0.002294 | ✓ |
| US TREASURY N/B | 0.002260 | ✓ |
| US TREASURY N/B | 0.002248 | ✓ |
| US TREASURY N/B | 0.002241 |  |
| US TREASURY N/B | 0.002226 | ✓ |
| US TREASURY N/B | 0.002211 | ✓ |
| G2 MA7192 | 0.002184 | ✓ |
| US TREASURY N/B | 0.002144 | ✓ |
| US TREASURY N/B | 0.002127 |  |


## Sources

- N-PORT (fund A) — accession `0000035402-26-002649` (as of 2026-02-28)
  <https://www.sec.gov/Archives/edgar/data/35315/000003540226002649/0000035402-26-002649-index.htm>
- N-PORT (fund B) — accession `0002071691-26-007327` (as of 2026-01-31)
  <https://www.sec.gov/Archives/edgar/data/1100663/000207169126007327/0002071691-26-007327-index.htm>

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