ETF comparison
SPMBvsVMBS
Both US Aggregate Bond.
State Street SPDR Portfolio Mortgage Backed Bond ETF · Vanguard Mortgage-Backed Securities Index Fund ETF Shares
Holdings overlap
805 positions appear in both funds. Buying equal dollars of SPMB and VMBS would leave roughly21.2%of each dollar exposed to the same underlying securities.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — seewhat we don't scorefor why.
Cost difference
VMBS is 1 bps cheaper than SPMB. On a $100,000 position that's about $10/yr more in fees for SPMB.
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open thecost calculator pre-filled with SPMB vs VMBS.
Top shared holdings
805 shared in total| # | Holding | In SPMB | In VMBS | Overlap |
|---|---|---|---|---|
| 1 | Government National Mortgage Association | 0.44% | 0.36% | 0.36% |
| 2 | Government National Mortgage Association | 0.41% | 0.31% | 0.31% |
| 3 | Freddie Mac | 0.42% | 0.27% | 0.27% |
| 4 | Freddie Mac | 1.17% | 0.24% | 0.24% |
| 5 | Freddie Mac | 0.41% | 0.24% | 0.24% |
| 6 | Freddie Mac | 0.29% | 0.23% | 0.23% |
| 7 | Freddie Mac | 0.33% | 0.21% | 0.21% |
| 8 | Government National Mortgage Association | 0.28% | 0.20% | 0.20% |
| 9 | Government National Mortgage Association | 0.30% | 0.20% | 0.20% |
| 10 | Freddie Mac | 0.35% | 0.20% | 0.20% |
| 11 | Fannie Mae | 0.30% | 0.18% | 0.18% |
| 12 | Fannie Mae | 0.26% | 0.18% | 0.18% |
Only in SPMB
1,895 total- State Street Global Advisors1.03%
- Fannie Mae0.79%
- Freddie Mac0.61%
- Fannie Mae0.49%
- Fannie Mae0.47%
- UMBS, TBA0.46%
- Fannie Mae0.45%
- Freddie Mac0.44%
- Freddie Mac0.44%
- Government National Mortgage Association0.42%
Only in VMBS
4,307 total- Fannie Mae or Freddie Mac0.52%
- Ginnie Mae II Pool0.32%
- Fannie Mae Pool0.29%
- Ginnie Mae II Pool0.29%
- Ginnie Mae II Pool0.29%
- Ginnie Mae II Pool0.28%
- Freddie Mac Pool0.27%
- Freddie Mac Pool0.26%
- Fannie Mae or Freddie Mac0.25%
- Fannie Mae or Freddie Mac0.20%
Open SPMB or VMBS at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodologyand funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions matched on ISIN (CUSIP fallback). Methodology: see/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.