ETF comparison
MBB vs VUSB
Both US Aggregate Bond.
Holdings overlap
0 positions appear in both funds. Buying equal dollars of MBB and VUSB would leave roughly 0.0% 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
MBB is 6 bps cheaper than VUSB. On a $100,000 position that's about $60/yr more in fees for VUSB.
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 MBB vs VUSB.
Top shared holdings
0 shared in totalNo shared holdings between these funds.
Only in MBB
11,144 total- Freddie Mac 1.05%
- Government National Mortgage Association 0.95%
- UMBS, TBA 0.83%
- Government National Mortgage Association 0.67%
- UMBS, TBA 0.64%
- Government National Mortgage Association 0.55%
- Government National Mortgage Association 0.54%
- Government National Mortgage Association 0.53%
- Fannie Mae 0.52%
- Freddie Mac 0.50%
Only in VUSB
1,281 total- United States Treasury Bill 4.19%
- United States Treasury Note/Bond 0.67%
- PNC Financial Services Group Inc/The 0.58%
- United States Treasury Note/Bond 0.52%
- Regions Bank/Birmingham AL 0.51%
- US Bancorp 0.50%
- Charles Schwab Corp/The 0.49%
- Truist Bank 0.44%
- Westlake Flooring Master Trust 0.44%
- DLLAD 2024-1 LLC 0.43%
Related comparisons
More comparisons with MBB
- MBB vs VMBS · Vanguard Mortgage-Backed Securities Index Fund ETF Shares 17.2%
- MBB vs AGG · iShares Core U.S. Aggregate Bond ETF 16.7%
- MBB vs SPMB · State Street SPDR Portfolio Mortgage Backed Bond ETF 14.5%
- MBB vs EAGG · iShares ESG U.S. Aggregate Bond ETF 12.9%
- MBB vs IUSB · iShares Core Universal USD Bond ETF 9.0%
- MBB vs SCHZ · Schwab U.S. Aggregate Bond ETF 6.8%
More comparisons with VUSB
- VUSB vs SCHP · Schwab U.S. TIPS ETF 0.0%
- VUSB vs SPMB · State Street SPDR Portfolio Mortgage Backed Bond ETF 0.0%
- VUSB vs TIP · iShares TIPS Bond ETF 0.0%
- VUSB vs TLT · iShares 20+ Year Treasury Bond ETF 0.0%
- VUSB vs VGLT · Vanguard Long-Term Treasury Index Fund ETF Shares 0.0%
- VUSB vs VMBS · Vanguard Mortgage-Backed Securities Index Fund ETF Shares 0.0%
Percentages are holdings overlap with the named fund.
Open MBB or VUSB 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.