SCHZ vs IUSB: Holdings Overlap
SCHZSchwab U.S. Aggregate Bond ETF
Schwab · 12081 holdings · $10.5B · as of 2026-03-31
IUSBiShares Core Universal USD Bond ETF
iShares · 17783 holdings · $43.2B · as of 2026-04-30
Holdings snapshots are 30 days apart (SCHZ: 2026-03-31, IUSB: 2026-04-30). 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 SCHZ and IUSB?
Schwab U.S. Aggregate Bond ETF (SCHZ, by Schwab) holds 12081 positions; iShares Core Universal USD Bond ETF (IUSB, by iShares) holds 17783. 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
- 9372SCHZ holds 12081 · IUSB holds 17783
- Weight in Shared Holdings
- SCHZ 76%·IUSB 67%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 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%
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%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| SCHZ | -0.2% | +0.1% | +2.5% | +4.2% | -0.2% | +1.4% | 4.20% |
| IUSB | -0.2% | +0.3% | +2.8% | +4.7% | +0.2% | +1.8% | 4.28% |
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 SCHZ vs IUSB →
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 | 0.38% | 0.37% | 0.37% |
|---|---|---|---|
| U.S. Treasury Notes | 0.38% | 0.37% | 0.37% |
| U.S. Treasury Notes | 0.37% | 0.37% | 0.37% |
| U.S. Treasury Notes | 0.38% | 0.36% | 0.36% |
| U.S. Treasury Notes | 0.38% | 0.36% | 0.36% |
| U.S. Treasury Notes | 0.39% | 0.36% | 0.36% |
| U.S. Treasury Notes | 0.36% | 0.35% | 0.35% |
| U.S. Treasury Notes | 0.38% | 0.34% | 0.34% |
| U.S. Treasury Notes | 0.44% | 0.33% | 0.33% |
| U.S. Treasury Notes | 0.34% | 0.33% | 0.33% |
| U.S. Treasury Notes | 0.31% | 0.37% | 0.31% |
| U.S. Treasury Notes | 0.30% | 0.31% | 0.30% |
| U.S. Treasury Notes | 0.31% | 0.28% | 0.28% |
| U.S. Treasury Notes | 0.27% | 0.32% | 0.27% |
| U.S. Treasury Notes | 0.31% | 0.27% | 0.27% |
| U.S. Treasury Notes | 0.28% | 0.27% | 0.27% |
| U.S. Treasury Notes | 0.27% | 0.34% | 0.27% |
| U.S. Treasury Notes | 0.26% | 0.33% | 0.26% |
| U.S. Treasury Notes | 0.26% | 0.29% | 0.26% |
| U.S. Treasury Notes | 0.30% | 0.26% | 0.26% |
| U.S. Treasury Notes | 0.28% | 0.26% | 0.26% |
| U.S. Treasury Notes | 0.31% | 0.25% | 0.25% |
| U.S. Treasury Notes | 0.27% | 0.25% | 0.25% |
| U.S. Treasury Notes | 0.32% | 0.25% | 0.25% |
| U.S. Treasury Notes | 0.24% | 0.28% | 0.24% |
Showing the top 250 of 9372 shared holdings by overlap weight.
Frequently Asked Questions
How much do SCHZ and IUSB overlap?
SCHZ and IUSB overlap by 60.5% of portfolio weight. They share 9372 holdings (SCHZ holds 12081 positions and IUSB holds 17783), based on each fund's latest SEC-reported holdings.
Is it redundant to own both SCHZ and IUSB?
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 SCHZ and IUSB?
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 SCHZ own that IUSB doesn't?
2709 positions (22.1% of SCHZ) are unique to SCHZ, led by Uniform Mortgage-Backed Security, TBA, Uniform Mortgage-Backed Security, TBA and U.S. Treasury Notes. In the other direction, 8411 positions (31.2% of IUSB) are unique to IUSB.