BIV vs SPMB: Holdings Overlap
BIVVanguard Intermediate-term Bond Index Fund
Vanguard · 2340 holdings · $28.9B · as of 2026-03-31
SPMBState Street® SPDR® Portfolio Mortgage Backed Bond ETF
State Street (SPDR) · 2714 holdings · $7.0B · as of 2026-08-06
Holdings snapshots are 128 days apart (BIV: 2026-03-31, SPMB: 2026-08-06). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are BIV and SPMB?
Vanguard Intermediate-term Bond Index Fund (BIV, by Vanguard) holds 2340 positions; State Street® SPDR® Portfolio Mortgage Backed Bond ETF (SPMB, by State Street (SPDR)) holds 2714. They have 0 holdings in common, and by portfolio weight the two funds are 0.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 0BIV holds 2340 · SPMB holds 2714
- Weight in Shared Holdings
- BIV 0%·SPMB 0%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in BIV
2340 of 2340 positions (98.8% of the fund) are not held by SPMB. Showing the top 30 by weight.
- U.S. Treasury Notes2.29%
- U.S. Treasury Notes2.20%
- U.S. Treasury Notes2.19%
- U.S. Treasury Notes2.18%
- U.S. Treasury Notes2.06%
- U.S. Treasury Notes2.06%
Only in SPMB
2714 of 2714 positions (98.5% of the fund) are not held by BIV. Showing the top 30 by weight.
- FED HM LN PC POOL RQ0094 FR 02/56 FIXED 51.15%
- FNMA TBA 30 YR 5.5 SINGLE FAMILY MORTGAGE0.91%
- FNMA POOL MA4547 FN 02/52 FIXED 20.77%
- FNMA TBA 30 YR 5 SINGLE FAMILY MORTGAGE0.76%
- FED HM LN PC POOL RQ0041 FR 08/55 FIXED 60.74%
- FED HM LN PC POOL SD8212 FR 05/52 FIXED 2.50.60%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| BIV | -0.2% | -0.3% | +2.0% | +4.6% | -0.1% | +1.7% | 4.31% |
| SPMB | -0.1% | +0.5% | +3.9% | +4.7% | +0.2% | +1.2% | 4.15% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in BIV vs SPMB →
Shared Holdings(0)
These two funds have no holdings in common.
Frequently Asked Questions
How much do BIV and SPMB overlap?
BIV and SPMB overlap by 0.0% of portfolio weight. They share 0 holdings (BIV holds 2340 positions and SPMB holds 2714), based on each fund's latest SEC-reported holdings.
Is it redundant to own both BIV and SPMB?
The two portfolios are 0.0% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What does BIV own that SPMB doesn't?
2340 positions (98.8% of BIV) are unique to BIV, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes. In the other direction, 2714 positions (98.5% of SPMB) are unique to SPMB.