ETF comparison
MBBvsVMBS
Both US Aggregate Bond.
iShares MBS ETF · Vanguard Mortgage-Backed Securities Index Fund ETF Shares
Holdings overlap
1,212 positions appear in both funds. Buying equal dollars of MBB and VMBS would leave roughly17.2%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 MBB. On a $100,000 position that's about $10/yr more in fees for MBB.
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 MBB vs VMBS.
Top shared holdings
1,212 shared in total| # | Holding | In MBB | In VMBS | Overlap |
|---|---|---|---|---|
| 1 | Government National Mortgage Association | 0.55% | 0.32% | 0.32% |
| 2 | Government National Mortgage Association | 0.95% | 0.29% | 0.29% |
| 3 | Freddie Mac | 1.05% | 0.26% | 0.26% |
| 4 | Freddie Mac | 0.22% | 0.20% | 0.20% |
| 5 | UMBS, TBA | 0.34% | 0.20% | 0.20% |
| 6 | Government National Mortgage Association | 0.31% | 0.20% | 0.20% |
| 7 | Fannie Mae | 0.30% | 0.18% | 0.18% |
| 8 | Freddie Mac | 0.24% | 0.16% | 0.16% |
| 9 | Government National Mortgage Association | 0.20% | 0.16% | 0.16% |
| 10 | Government National Mortgage Association | 0.67% | 0.15% | 0.15% |
| 11 | UMBS, TBA | 0.83% | 0.15% | 0.15% |
| 12 | Fannie Mae | 0.15% | 0.18% | 0.15% |
Only in MBB
9,933 total- BLACKROCK CASH FUNDS6.77%
- Government National Mortgage Association0.53%
- Fannie Mae0.52%
- Government National Mortgage Association0.46%
- Fannie Mae0.44%
- Fannie Mae0.44%
- Fannie Mae0.33%
- Fannie Mae0.33%
- Government National Mortgage Association0.28%
- Fannie Mae0.28%
Only in VMBS
3,900 total- Ginnie Mae II Pool0.36%
- Fannie Mae Pool0.29%
- Freddie Mac Pool0.27%
- Freddie Mac Pool0.27%
- Fannie Mae or Freddie Mac0.25%
- Freddie Mac Pool0.24%
- Freddie Mac Pool0.24%
- Ginnie Mae II Pool0.20%
- Fannie Mae Pool0.20%
- Ginnie Mae II Pool0.19%
Open MBB 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.