VMBS vs VOO: Holdings Overlap
VMBSVanguard Mortgage-backed Securities Index Fund
Vanguard · 5112 holdings · $15.6B · as of 2026-05-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
Holdings snapshots are 61 days apart (VMBS: 2026-05-31, VOO: 2026-03-31). 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 VMBS and VOO?
Vanguard Mortgage-backed Securities Index Fund (VMBS, by Vanguard) holds 5112 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. 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
- 0VMBS holds 5112 · VOO holds 504
- Weight in Shared Holdings
- VMBS 0%·VOO 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 VMBS
5112 of 5112 positions (99.3% of the fund) are not held by VOO. Showing the top 30 by weight.
- Uniform Mortgage-Backed Security, TBA0.52%
- G2SF 5.5 7/260.36%
- Government National Mortgage Association0.32%
- Ginnie Mae II Pool0.31%
- FN CC27620.29%
- Government National Mortgage Association0.29%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| VMBS | -0.1% | +0.6% | +4.1% | +4.9% | +0.4% | +1.3% | 4.23% |
| VOO | +3.4% | +14.0% | +23.7% | +21.3% | +13.4% | +15.4% | 1.03% |
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 VMBS vs VOO →
Shared Holdings(0)
These two funds have no holdings in common.
Frequently Asked Questions
How much do VMBS and VOO overlap?
VMBS and VOO overlap by 0.0% of portfolio weight. They share 0 holdings (VMBS holds 5112 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both VMBS and VOO?
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 VMBS own that VOO doesn't?
5112 positions (99.3% of VMBS) are unique to VMBS, led by Uniform Mortgage-Backed Security, TBA, G2SF 5.5 7/26 and Government National Mortgage Association. In the other direction, 504 positions (99.8% of VOO) are unique to VOO.