ETF comparison
BND vs SPMB
Both US Aggregate Bond.
Vanguard Total Bond Market Index Fund ETF Shares · State Street SPDR Portfolio Mortgage Backed Bond ETF
Holdings overlap
845 positions appear in both funds. Buying equal dollars of BND and SPMB would leave roughly 5.9% 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 SPMB. On a $100,000 position that's about $10/yr more in fees for SPMB.
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 SPMB.
Top shared holdings
845 shared in total| # | Holding | In BND | In SPMB | Overlap |
|---|---|---|---|---|
| 1 | Ginnie Mae II Pool | 0.11% | 0.36% | 0.11% |
| 2 | Ginnie Mae II Pool | 0.07% | 0.23% | 0.07% |
| 3 | Fannie Mae Pool | 0.06% | 0.26% | 0.06% |
| 4 | Fannie Mae Pool | 0.06% | 0.14% | 0.06% |
| 5 | Ginnie Mae II Pool | 0.06% | 0.42% | 0.06% |
| 6 | Freddie Mac Pool | 0.06% | 0.29% | 0.06% |
| 7 | Fannie Mae Pool | 0.06% | 0.17% | 0.06% |
| 8 | Freddie Mac Pool | 0.05% | 0.23% | 0.05% |
| 9 | Fannie Mae Pool | 0.05% | 0.26% | 0.05% |
| 10 | Fannie Mae or Freddie Mac | 0.05% | 0.20% | 0.05% |
| 11 | Ginnie Mae II Pool | 0.05% | 0.32% | 0.05% |
| 12 | Ginnie Mae II Pool | 0.06% | 0.05% | 0.05% |
Only in BND
16,551 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 SPMB
1,854 total- Fannie Mae 0.49%
- Fannie Mae 0.47%
- Fannie Mae 0.45%
- Freddie Mac 0.44%
- Fannie Mae 0.37%
- Fannie Mae 0.36%
- Fannie Mae 0.35%
- Fannie Mae 0.35%
- Freddie Mac 0.35%
- Freddie Mac 0.32%
Related comparisons
More comparisons with BND
- BND vs TLT · iShares 20+ Year Treasury Bond ETF 5.6%
- BND vs CORP · PIMCO Investment Grade Corporate Bond Index Exchange-Traded Fund 5.4%
- BND vs MBB · iShares MBS ETF 5.2%
- 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%
More comparisons with SPMB
- SPMB vs AGG · iShares Core U.S. Aggregate Bond ETF 5.5%
- SPMB vs VCRB · Vanguard Core Bond ETF 4.9%
- SPMB vs EAGG · iShares ESG U.S. Aggregate Bond ETF 3.9%
- SPMB vs CGCP · Capital Group Core Plus Income ETF 3.8%
- SPMB vs IUSB · iShares Core Universal USD Bond ETF 3.6%
- SPMB vs FBND · Fidelity Total Bond ETF 2.6%
Percentages are holdings overlap with the named fund.
Open BND 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.