ETF comparison
FBND vs MBB
Both US Aggregate Bond.
Holdings overlap
157 positions appear in both funds. Buying equal dollars of FBND and MBB would leave roughly 4.8% 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 32 bps cheaper than FBND. On a $100,000 position that's about $320/yr more in fees for FBND.
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 FBND vs MBB.
Top shared holdings
157 shared in total| # | Holding | In FBND | In MBB | Overlap |
|---|---|---|---|---|
| 1 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 1.14% | 0.95% | 0.95% |
| 2 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.89% | 0.67% | 0.67% |
| 3 | FNMA/FHLG TBA ISSUER | 0.73% | 0.64% | 0.64% |
| 4 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.41% | 0.46% | 0.41% |
| 5 | FNMA/FHLG TBA ISSUER | 0.44% | 0.34% | 0.34% |
| 6 | FNMA/FHLG TBA ISSUER | 0.26% | 0.83% | 0.26% |
| 7 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.23% | 0.45% | 0.23% |
| 8 | FNMA GTD MTG PASS THRU CTF | 0.10% | 0.30% | 0.10% |
| 9 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.18% | 0.09% | 0.09% |
| 10 | FED HOME LOAN MTG CORP - GOLD | 0.08% | 0.22% | 0.08% |
| 11 | FNMA GTD MTG PASS THRU CTF | 0.08% | 0.10% | 0.08% |
| 12 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.07% | 0.27% | 0.07% |
Only in FBND
4,312 total- Fidelity Revere Street Trust 4.62%
- UST NOTES 2.34%
- UST NOTES 2.21%
- UST NOTES 2.17%
- UST NOTES 1.81%
- UNITED STATES TREASURY BOND 1.53%
- UST NOTES 1.49%
- UNITED STATES TREASURY BOND 1.26%
- UST NOTES 1.20%
- UST NOTES 1.18%
Only in MBB
10,987 total- Government National Mortgage Association 0.55%
- Government National Mortgage Association 0.54%
- Fannie Mae 0.52%
- Fannie Mae 0.44%
- Government National Mortgage Association 0.41%
- Government National Mortgage Association 0.36%
- Government National Mortgage Association 0.35%
- Fannie Mae 0.33%
- Fannie Mae 0.33%
- Government National Mortgage Association 0.30%
Related comparisons
More comparisons with FBND
- FBND vs VMBS · Vanguard Mortgage-Backed Securities Index Fund ETF Shares 4.5%
- FBND vs AGGY · WisdomTree Yield Enhanced U.S. Aggregate Bond Fund 4.4%
- FBND vs NEAR · iShares Short Duration Bond Active ETF 3.0%
- FBND vs BINC · iShares Flexible Income Active ETF 2.9%
- FBND vs PYLD · PIMCO ETF Trust - PIMCO Multisector Bond Active Exchange-Traded Fund 2.7%
- FBND vs BSV · Vanguard Short-Term Bond Index Fund ETF Shares 2.7%
More comparisons with MBB
- 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%
- MBB vs PYLD · PIMCO ETF Trust - PIMCO Multisector Bond Active Exchange-Traded Fund 0.2%
Percentages are holdings overlap with the named fund.
Open FBND 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.