ETF comparison
AGGvsSPAB
Both US Aggregate Bond.
iShares Core U.S. Aggregate Bond ETF · State Street SPDR Portfolio Aggregate Bond ETF
Holdings overlap
6,804 positions appear in both funds. Buying equal dollars of AGG and SPAB would leave roughly56.7%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
Expense ratios are effectively identical (0.030% vs 0.030%).
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 AGG vs SPAB.
Top shared holdings
6,804 shared in total| # | Holding | In AGG | In SPAB | Overlap |
|---|---|---|---|---|
| 1 | United States Treasury | 0.41% | 0.40% | 0.40% |
| 2 | United States Treasury | 0.39% | 0.40% | 0.39% |
| 3 | United States Treasury | 0.38% | 0.37% | 0.37% |
| 4 | United States Treasury | 0.40% | 0.37% | 0.37% |
| 5 | United States Treasury | 0.42% | 0.37% | 0.37% |
| 6 | United States Treasury | 0.40% | 0.37% | 0.37% |
| 7 | United States Treasury | 0.37% | 0.36% | 0.36% |
| 8 | United States Treasury | 0.39% | 0.34% | 0.34% |
| 9 | United States Treasury | 0.39% | 0.34% | 0.34% |
| 10 | United States Treasury | 0.39% | 0.33% | 0.33% |
| 11 | United States Treasury | 0.35% | 0.32% | 0.32% |
| 12 | United States Treasury | 0.31% | 0.34% | 0.31% |
Only in AGG
6,463 total- BlackRock Funds III0.62%
- United States Treasury0.33%
- United States Treasury0.32%
- United States Treasury0.24%
- United States Treasury0.24%
- United States Treasury0.22%
- United States Treasury0.21%
- UMBS, TBA0.20%
- United States Treasury0.19%
- United States Treasury0.17%
Only in SPAB
1,482 total- 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%
- Freddie Mac0.20%
- Freddie Mac0.20%
Open AGG 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.