IUSB vs SCHZ: Holdings Overlap
IUSBiShares Core Universal USD Bond ETF
iShares · 17783 holdings · $43.2B · as of 2026-04-30
SCHZSchwab U.S. Aggregate Bond ETF
Schwab · 12081 holdings · $10.5B · as of 2026-03-31
Holdings snapshots are 30 days apart (IUSB: 2026-04-30, SCHZ: 2026-03-31). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are IUSB and SCHZ?
iShares Core Universal USD Bond ETF (IUSB, by iShares) holds 17783 positions; Schwab U.S. Aggregate Bond ETF (SCHZ, by Schwab) holds 12081. They have 9372 holdings in common, and by portfolio weight the two funds are 60.5% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 60.5%Sum of the smaller weight of each shared holding
- Shared Holdings
- 9372IUSB holds 17783 · SCHZ holds 12081
- Weight in Shared Holdings
- IUSB 67%·SCHZ 76%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in IUSB
8411 of 17783 positions (31.2% of the fund) are not held by SCHZ. Showing the top 30 by weight.
- Uniform Mortgage-Backed Securities0.32%
- Uniform Mortgage-Backed Securities0.22%
- Government National Mortgage Association0.21%
- Uniform Mortgage-Backed Securities0.20%
- Uniform Mortgage-Backed Securities0.19%
- Government National Mortgage Association0.18%
Only in SCHZ
2709 of 12081 positions (22.1% of the fund) are not held by IUSB. Showing the top 30 by weight.
- Uniform Mortgage-Backed Security, TBA0.34%
- Uniform Mortgage-Backed Security, TBA0.28%
- U.S. Treasury Notes0.25%
- Uniform Mortgage-Backed Security, TBA0.22%
- U.S. Treasury Notes0.22%
- Uniform Mortgage-Backed Security, TBA0.17%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IUSB | -0.2% | +0.3% | +2.8% | +4.7% | +0.2% | +1.8% | 4.28% |
| SCHZ | -0.2% | +0.1% | +2.5% | +4.2% | -0.2% | +1.4% | 4.20% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in IUSB vs SCHZ →
Shared Holdings(9372)
The top 10 shared positions account for 6% of the overlap, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes.
| U.S. Treasury Notes | 0.37% | 0.38% | 0.37% |
|---|---|---|---|
| U.S. Treasury Notes | 0.37% | 0.38% | 0.37% |
| U.S. Treasury Notes | 0.37% | 0.37% | 0.37% |
| U.S. Treasury Notes | 0.36% | 0.38% | 0.36% |
| U.S. Treasury Notes | 0.36% | 0.38% | 0.36% |
| U.S. Treasury Notes | 0.36% | 0.39% | 0.36% |
| U.S. Treasury Notes | 0.35% | 0.36% | 0.35% |
| U.S. Treasury Notes | 0.34% | 0.38% | 0.34% |
| U.S. Treasury Notes | 0.33% | 0.44% | 0.33% |
| U.S. Treasury Notes | 0.33% | 0.34% | 0.33% |
| U.S. Treasury Notes | 0.37% | 0.31% | 0.31% |
| U.S. Treasury Notes | 0.31% | 0.30% | 0.30% |
| U.S. Treasury Notes | 0.28% | 0.31% | 0.28% |
| U.S. Treasury Notes | 0.32% | 0.27% | 0.27% |
| U.S. Treasury Notes | 0.27% | 0.31% | 0.27% |
| U.S. Treasury Notes | 0.27% | 0.28% | 0.27% |
| U.S. Treasury Notes | 0.34% | 0.27% | 0.27% |
| U.S. Treasury Notes | 0.33% | 0.26% | 0.26% |
| U.S. Treasury Notes | 0.29% | 0.26% | 0.26% |
| U.S. Treasury Notes | 0.26% | 0.30% | 0.26% |
| U.S. Treasury Notes | 0.26% | 0.28% | 0.26% |
| U.S. Treasury Notes | 0.25% | 0.31% | 0.25% |
| U.S. Treasury Notes | 0.25% | 0.27% | 0.25% |
| U.S. Treasury Notes | 0.25% | 0.32% | 0.25% |
| U.S. Treasury Notes | 0.28% | 0.24% | 0.24% |
Showing the top 250 of 9372 shared holdings by overlap weight.
Frequently Asked Questions
How much do IUSB and SCHZ overlap?
IUSB and SCHZ overlap by 60.5% of portfolio weight. They share 9372 holdings (IUSB holds 17783 positions and SCHZ holds 12081), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IUSB and SCHZ?
The two portfolios are 60.5% identical by weight. Owning both mostly doubles down on the shared core rather than diversifying: the same large positions drive both funds.
What are the biggest shared holdings of IUSB and SCHZ?
The largest positions held by both funds are U.S. Treasury Notes, U.S. Treasury Notes, U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes. Together the top 10 shared positions account for 6% of the total overlap.
What does IUSB own that SCHZ doesn't?
8411 positions (31.2% of IUSB) are unique to IUSB, led by Uniform Mortgage-Backed Securities, Uniform Mortgage-Backed Securities and Government National Mortgage Association. In the other direction, 2709 positions (22.1% of SCHZ) are unique to SCHZ.