# Portfolio overlap — FIFZX vs SSAFX

Comparing **Fidelity Series Bond Index Fund** (2026-02-28) and **State Street Aggregate Bond Index Portfolio** (2026-03-31).

- Shared positions: 2690
- Fidelity Series Bond Index Fund covered by State Street Aggregate Bond Index Portfolio: 0.3691299850476747218268505211
- State Street Aggregate Bond Index Portfolio covered by Fidelity Series Bond Index Fund: 0.3691299850476747218268505213

## Fidelity Series Bond Index Fund — top positions

| Security | Weight | Shared |
|----------|--------|--------|
| US TREASURY N/B | 0.011257 | ✓ |
| US TREASURY N/B | 0.010648 | ✓ |
| US TREASURY N/B | 0.009228 | ✓ |
| US TREASURY N/B | 0.008011 | ✓ |
| US TREASURY N/B | 0.007152 | ✓ |
| US TREASURY N/B | 0.006840 | ✓ |
| US TREASURY N/B | 0.006594 | ✓ |
| Fidelity Cash Central Fund | 0.006318 |  |
| US TREASURY N/B | 0.006218 | ✓ |
| US TREASURY N/B | 0.006205 | ✓ |
| US TREASURY N/B | 0.006178 | ✓ |
| Fidelity Securities Lending Cash Central Fund | 0.005920 |  |
| US TREASURY N/B | 0.005903 | ✓ |
| US TREASURY N/B | 0.005772 | ✓ |
| US TREASURY N/B | 0.005443 | ✓ |
| US TREASURY N/B | 0.005260 | ✓ |
| US TREASURY N/B | 0.005202 | ✓ |
| US TREASURY N/B | 0.004961 | ✓ |
| US TREASURY N/B | 0.004954 | ✓ |
| US TREASURY N/B | 0.004949 | ✓ |
| US TREASURY N/B | 0.004926 | ✓ |
| FR SD8121 | 0.004907 | ✓ |
| US TREASURY N/B | 0.004843 | ✓ |
| US TREASURY N/B | 0.004554 | ✓ |
| US TREASURY N/B | 0.004535 | ✓ |
| US TREASURY N/B | 0.004417 | ✓ |
| US TREASURY N/B | 0.004405 | ✓ |
| US TREASURY N/B | 0.004379 | ✓ |
| US TREASURY N/B | 0.004205 | ✓ |
| US TREASURY N/B | 0.004121 | ✓ |
| US TREASURY N/B | 0.003897 | ✓ |
| US TREASURY N/B | 0.003895 | ✓ |
| US TREASURY N/B | 0.003890 | ✓ |
| US TREASURY N/B | 0.003882 | ✓ |
| US TREASURY N/B | 0.003846 |  |
| US TREASURY N/B | 0.003830 | ✓ |
| US TREASURY N/B | 0.003818 | ✓ |
| US TREASURY N/B | 0.003748 | ✓ |
| US TREASURY N/B | 0.003696 | ✓ |
| US TREASURY N/B | 0.003667 | ✓ |
| US TREASURY N/B | 0.003631 | ✓ |
| US TREASURY N/B | 0.003625 | ✓ |
| US TREASURY N/B | 0.003611 | ✓ |
| US TREASURY N/B | 0.003608 | ✓ |
| US TREASURY N/B | 0.003580 | ✓ |
| US TREASURY N/B | 0.003496 | ✓ |
| US TREASURY N/B | 0.003480 | ✓ |
| US TREASURY N/B | 0.003479 | ✓ |
| G2SF 5 3/25 | 0.003405 |  |
| US TREASURY N/B | 0.003367 |  |

## State Street Aggregate Bond Index Portfolio — top positions

| Security | Weight | Shared |
|----------|--------|--------|
| State Street Navigator Securities Lending Portfolio II | 0.056865 |  |
| US TREASURY N/B | 0.004320 | ✓ |
| US TREASURY N/B | 0.004099 |  |
| US TREASURY N/B | 0.004060 | ✓ |
| US TREASURY N/B | 0.004028 | ✓ |
| US TREASURY N/B | 0.003894 |  |
| US TREASURY N/B | 0.003806 | ✓ |
| US TREASURY N/B | 0.003722 |  |
| US TREASURY N/B | 0.003719 | ✓ |
| US TREASURY N/B | 0.003494 | ✓ |
| US TREASURY N/B | 0.003479 | ✓ |
| US TREASURY N/B | 0.003461 | ✓ |
| US TREASURY N/B | 0.003421 | ✓ |
| US TREASURY N/B | 0.003400 |  |
| US TREASURY N/B | 0.003366 | ✓ |
| US TREASURY N/B | 0.003215 | ✓ |
| US TREASURY N/B | 0.003156 | ✓ |
| US TREASURY N/B | 0.003140 | ✓ |
| US TREASURY N/B | 0.003123 | ✓ |
| US TREASURY N/B | 0.003113 | ✓ |
| US TREASURY N/B | 0.003109 |  |
| FR RQ0041 | 0.003104 |  |
| US TREASURY N/B | 0.003058 |  |
| US TREASURY N/B | 0.003039 | ✓ |
| US TREASURY N/B | 0.003020 | ✓ |
| US TREASURY N/B | 0.003007 |  |
| US TREASURY N/B | 0.002936 | ✓ |
| US TREASURY N/B | 0.002933 | ✓ |
| US TREASURY N/B | 0.002926 |  |
| US TREASURY N/B | 0.002836 | ✓ |
| US TREASURY N/B | 0.002810 | ✓ |
| US TREASURY N/B | 0.002805 |  |
| US TREASURY N/B | 0.002797 | ✓ |
| US TREASURY N/B | 0.002786 |  |
| US TREASURY N/B | 0.002768 | ✓ |
| US TREASURY N/B | 0.002751 | ✓ |
| US TREASURY N/B | 0.002678 |  |
| US TREASURY N/B | 0.002648 | ✓ |
| US TREASURY N/B | 0.002646 | ✓ |
| US TREASURY N/B | 0.002618 | ✓ |
| US TREASURY N/B | 0.002591 |  |
| FN MA4465 | 0.002574 | ✓ |
| US TREASURY N/B | 0.002574 |  |
| US TREASURY N/B | 0.002531 | ✓ |
| FR SD8475 | 0.002526 | ✓ |
| US TREASURY N/B | 0.002526 | ✓ |
| US TREASURY N/B | 0.002512 | ✓ |
| US TREASURY N/B | 0.002503 | ✓ |
| US TREASURY N/B | 0.002496 | ✓ |
| US TREASURY N/B | 0.002453 | ✓ |


## Sources

- N-PORT (fund A) — accession `0000035402-26-002627` (as of 2026-02-28)
  <https://www.sec.gov/Archives/edgar/data/35315/000003540226002627/0000035402-26-002627-index.htm>
- N-PORT (fund B) — accession `0001410368-26-055492` (as of 2026-03-31)
  <https://www.sec.gov/Archives/edgar/data/1107414/000141036826055492/0001410368-26-055492-index.htm>

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