ETF comparison
BND vs MBB
Both US Aggregate Bond.
Vanguard Total Bond Market Index Fund ETF Shares · iShares MBS ETF
Holdings overlap
1,358 positions appear in both funds. Buying equal dollars of BND and MBB would leave roughly 5.2% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
BND 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 the cost calculator pre-filled with BND vs MBB.
Top shared holdings
1,358 shared in total| # | Holding | In BND | In MBB | Overlap |
|---|---|---|---|---|
| 1 | Fannie Mae Pool | 0.06% | 0.12% | 0.06% |
| 2 | Ginnie Mae II Pool | 0.06% | 0.06% | 0.06% |
| 3 | Ginnie Mae II Pool | 0.05% | 0.15% | 0.05% |
| 4 | Fannie Mae Pool | 0.05% | 0.30% | 0.05% |
| 5 | Fannie Mae Pool | 0.06% | 0.05% | 0.05% |
| 6 | Fannie Mae Pool | 0.05% | 0.11% | 0.05% |
| 7 | Freddie Mac Pool | 0.04% | 0.22% | 0.04% |
| 8 | Ginnie Mae II Pool | 0.04% | 0.55% | 0.04% |
| 9 | Freddie Mac Pool | 0.04% | 1.05% | 0.04% |
| 10 | Ginnie Mae II Pool | 0.07% | 0.04% | 0.04% |
| 11 | Ginnie Mae II Pool | 0.04% | 0.04% | 0.04% |
| 12 | Ginnie Mae II Pool | 0.04% | 0.05% | 0.04% |
Only in BND
16,038 total- United States Treasury Note/Bond 0.47%
- United States Treasury Note/Bond 0.41%
- United States Treasury Note/Bond 0.41%
- United States Treasury Note/Bond 0.41%
- United States Treasury Note/Bond 0.41%
- United States Treasury Note/Bond 0.41%
- United States Treasury Note/Bond 0.41%
- United States Treasury Note/Bond 0.40%
- United States Treasury Note/Bond 0.39%
- United States Treasury Note/Bond 0.39%
Only in MBB
9,786 total- Government National Mortgage Association 0.95%
- UMBS, TBA 0.83%
- Government National Mortgage Association 0.67%
- UMBS, TBA 0.64%
- Fannie Mae 0.52%
- Government National Mortgage Association 0.46%
- Fannie Mae 0.44%
- Fannie Mae 0.44%
- UMBS, TBA 0.34%
- Fannie Mae 0.33%
Related comparisons
More comparisons with BND
- BND vs IEF · iShares 7-10 Year Treasury Bond ETF 5.1%
- BND vs TLH · iShares 10-20 Year Treasury Bond ETF 4.8%
- BND vs SPSB · State Street SPDR Portfolio Short Term Corporate Bond ETF 4.6%
- BND vs NEAR · iShares Short Duration Bond Active ETF 3.0%
- BND vs BOND · PIMCO Active Bond Exchange-Traded Fund 2.3%
- BND vs VUSB · Vanguard Ultra-Short Bond ETF 1.8%
More comparisons with MBB
- MBB vs FBND · Fidelity Total Bond ETF 4.8%
- MBB vs VCRB · Vanguard Core Bond ETF 3.2%
- MBB vs JCPB · JPMorgan Core Plus Bond ETF 2.3%
- MBB vs AGGY · WisdomTree Yield Enhanced U.S. Aggregate Bond Fund 1.4%
- MBB vs CGCP · Capital Group Core Plus Income ETF 0.9%
- MBB vs BOND · PIMCO Active Bond Exchange-Traded Fund 0.6%
Percentages are holdings overlap with the named fund.
Open BND or MBB 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 methodology and 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.