ETF comparison
FBND vs SPMB
Both US Aggregate Bond.
Fidelity Total Bond ETF · State Street SPDR Portfolio Mortgage Backed Bond Index ETF
Holdings overlap
129 positions appear in both funds. Buying equal dollars of FBND and SPMB would leave roughly 1.7% 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
SPMB 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 SPMB.
Top shared holdings
129 shared in total| # | Holding | In FBND | In SPMB | Overlap |
|---|---|---|---|---|
| 1 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.16% | 0.30% | 0.16% |
| 2 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.21% | 0.13% | 0.13% |
| 3 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.11% | 0.18% | 0.11% |
| 4 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.11% | 0.10% | 0.10% |
| 5 | FED HOME LOAN MTG CORP - GOLD | 0.10% | 0.09% | 0.09% |
| 6 | FNMA GTD MTG PASS THRU CTF | 0.09% | 0.26% | 0.09% |
| 7 | FED HOME LOAN MTG CORP - GOLD | 0.07% | 0.07% | 0.07% |
| 8 | FED HOME LOAN MTG CORP - GOLD | 0.17% | 0.06% | 0.06% |
| 9 | FED HOME LOAN MTG CORP - GOLD | 0.06% | 0.29% | 0.06% |
| 10 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.05% | 0.13% | 0.05% |
| 11 | GNMA II GTD PASS THRU CTF MULTIPLE ISSUER | 0.05% | 0.11% | 0.05% |
| 12 | GNMA GUARANTEED PASS THRU CERT | 0.07% | 0.04% | 0.04% |
Only in FBND
4,501 total- Fidelity Revere Street Trust 3.16%
- UST NOTES 2.73%
- UST NOTES 2.04%
- FNMA/FHLG TBA ISSUER 1.99%
- UST NOTES 1.97%
- UNITED STATES TREASURY BOND 1.37%
- UNITED STATES TREASURY BOND 1.36%
- UST NOTES 1.36%
- GNMA II GTD PASS THRU CTF MULTIPLE ISSUER 1.28%
- FNMA/FHLG TBA ISSUER 1.25%
Only in SPMB
2,570 total- Freddie Mac 1.17%
- Fannie Mae 0.79%
- Freddie Mac 0.76%
- UMBS, TBA 0.63%
- Freddie Mac 0.61%
- Freddie Mac 0.55%
- Government National Mortgage Association 0.55%
- Fannie Mae 0.51%
- Fannie Mae 0.49%
- Fannie Mae 0.47%
Related comparisons
More comparisons with FBND
- FBND vs VUSB · Vanguard Ultra-Short Bond ETF 0.9%
- FBND vs MINT · PIMCO Enhanced Short Maturity Active Exchange-Traded Fund 0.7%
- FBND vs JAAA · Janus Henderson AAA CLO ETF 0.7%
- FBND vs PAAA · PGIM AAA CLO ETF 0.5%
- FBND vs JPST · JPMorgan Ultra-Short Income ETF 0.5%
- FBND vs BNDX · Vanguard Total International Bond Index Fund ETF Shares 0.4%
More comparisons with SPMB
- SPMB vs AGGY · WisdomTree Yield Enhanced U.S. Aggregate Bond Fund 1.1%
- SPMB vs JCPB · JPMorgan Core Plus Bond ETF 0.2%
- SPMB vs BINC · iShares Flexible Income Active ETF 0.0%
- SPMB vs BIV · Vanguard Intermediate-Term Bond Index Fund ETF Shares 0.0%
- SPMB vs BLV · Vanguard Long-Term Bond Index Fund ETF Shares 0.0%
- SPMB vs BNDX · Vanguard Total International Bond Index Fund ETF Shares 0.0%
Percentages are holdings overlap with the named fund.
Open FBND or SPMB 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.