ETF comparison
IUSBvsSPAB
Both US Aggregate Bond.
iShares Core Universal USD Bond ETF · State Street SPDR Portfolio Aggregate Bond ETF
Holdings overlap
6,506 positions appear in both funds. Buying equal dollars of IUSB and SPAB would leave roughly49.6%of each dollar exposed to the same underlying securities.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — seewhat we don't scorefor why.
Cost difference
SPAB is 3 bps cheaper than IUSB. On a $100,000 position that's about $30/yr more in fees for IUSB.
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open thecost calculator pre-filled with IUSB vs SPAB.
Top shared holdings
6,506 shared in total| # | Holding | In IUSB | In SPAB | Overlap |
|---|---|---|---|---|
| 1 | United States of America | 0.37% | 0.40% | 0.37% |
| 2 | United States of America | 0.37% | 0.37% | 0.37% |
| 3 | United States of America | 0.37% | 0.37% | 0.37% |
| 4 | United States of America | 0.36% | 0.37% | 0.36% |
| 5 | United States of America | 0.35% | 0.37% | 0.35% |
| 6 | United States of America | 0.34% | 0.40% | 0.34% |
| 7 | United States of America | 0.36% | 0.34% | 0.34% |
| 8 | United States of America | 0.36% | 0.34% | 0.34% |
| 9 | United States of America | 0.33% | 0.33% | 0.33% |
| 10 | United States of America | 0.33% | 0.32% | 0.32% |
| 11 | United States of America | 0.32% | 0.34% | 0.32% |
| 12 | United States of America | 0.29% | 0.36% | 0.29% |
Only in IUSB
11,273 total- Blackrock Liquidity Tempcash2.88%
- Federal National Mortgage Association0.32%
- United States of America0.26%
- United States of America0.26%
- United States of America0.25%
- United States of America0.24%
- United States of America0.24%
- Federal National Mortgage Association or Federal Home Loan Mortgage Corp.0.22%
- United States of America0.22%
- United States of America0.21%
Only in SPAB
1,780 total- United States Treasury0.38%
- United States Treasury0.34%
- United States Treasury0.31%
- Government National Mortgage Association0.28%
- UMBS, TBA0.27%
- UMBS, TBA0.23%
- United States Treasury0.23%
- United States Treasury0.22%
- Government National Mortgage Association0.21%
- Freddie Mac0.20%
Open IUSB or SPAB 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 methodologyand 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.