ETF comparison
BIV vs SPMB
Both US Aggregate Bond.
Vanguard Intermediate-Term Bond Index Fund ETF Shares · State Street SPDR Portfolio Mortgage Backed Bond ETF
Holdings overlap
0 positions appear in both funds. Buying equal dollars of BIV and SPMB 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
BIV 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 BIV vs SPMB.
Top shared holdings
0 shared in totalNo shared holdings between these funds.
Only in BIV
2,355 total- United States Treasury Note/Bond 2.14%
- United States Treasury Note/Bond 2.14%
- United States Treasury Note/Bond 2.13%
- United States Treasury Note/Bond 2.10%
- United States Treasury Note/Bond 2.10%
- United States Treasury Note/Bond 2.08%
- United States Treasury Note/Bond 2.08%
- United States Treasury Note/Bond 2.04%
- United States Treasury Note/Bond 2.04%
- United States Treasury Note/Bond 2.02%
Only in SPMB
2,699 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 BIV
- BIV vs TIP · iShares TIPS Bond ETF 0.0%
- BIV vs TLT · iShares 20+ Year Treasury Bond ETF 0.0%
- BIV vs VGLT · Vanguard Long-Term Treasury Index Fund ETF Shares 0.0%
- BIV vs VGSH · Vanguard Short-Term Treasury Index Fund ETF Shares 0.0%
- BIV vs VMBS · Vanguard Mortgage-Backed Securities Index Fund ETF Shares 0.0%
- BIV vs VTIP · Vanguard Short-Term Inflation-Protected Securities Index Fund ETF Shares 0.0%
More comparisons with SPMB
- 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%
- SPMB vs BSV · Vanguard Short-Term Bond Index Fund ETF Shares 0.0%
- SPMB vs DFCF · Dimensional Core Fixed Income ETF 0.0%
- SPMB vs FLOT · iShares Floating Rate Bond ETF 0.0%
- SPMB vs GOVT · iShares U.S. Treasury Bond ETF 0.0%
Percentages are holdings overlap with the named fund.
Open BIV 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.