ISTB vs SHY: Holdings Overlap
ISTBiShares Core 1-5 Year USD Bond ETF
iShares · 7059 holdings · $5.1B · as of 2026-04-30
SHYiShares 1-3 Year Treasury Bond ETF
iShares · 89 holdings · $25.2B · as of 2026-05-31
Holdings snapshots are 31 days apart (ISTB: 2026-04-30, SHY: 2026-05-31). 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 ISTB and SHY?
iShares Core 1-5 Year USD Bond ETF (ISTB, by iShares) holds 7059 positions; iShares 1-3 Year Treasury Bond ETF (SHY, by iShares) holds 89. They have 86 holdings in common, and by portfolio weight the two funds are 27.2% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 27.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 86ISTB holds 7059 · SHY holds 89
- Weight in Shared Holdings
- ISTB 28%·SHY 96%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 ISTB
6973 of 7059 positions (71.0% of the fund) are not held by SHY. Showing the top 30 by weight.
- U.S. Treasury Notes0.99%
- U.S. Treasury Notes0.98%
- U.S. Treasury Notes0.96%
- U.S. Treasury Notes0.91%
- U.S. Treasury Notes0.89%
- U.S. Treasury Notes0.86%
Only in SHY
3 of 89 positions (3.0% of the fund) are not held by ISTB.
- U.S. Treasury Notes1.18%
- U.S. Treasury Notes1.16%
- U.S. Treasury Notes0.71%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| ISTB | +0.3% | +1.0% | +3.0% | +5.0% | +1.9% | +2.3% | 4.27% |
| SHY | +0.4% | +1.0% | +2.8% | +4.2% | +1.8% | +1.7% | 3.63% |
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 ISTB vs SHY →
Shared Holdings(86)
The top 10 shared positions account for 20% of the overlap, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes.
| U.S. Treasury Notes | 0.64% | 1.36% | 0.64% |
|---|---|---|---|
| U.S. Treasury Notes | 0.60% | 1.32% | 0.60% |
| U.S. Treasury Notes | 0.59% | 1.29% | 0.59% |
| U.S. Treasury Notes | 0.58% | 1.84% | 0.58% |
| U.S. Treasury Notes | 0.55% | 1.33% | 0.55% |
| U.S. Treasury Notes | 0.55% | 1.34% | 0.55% |
| U.S. Treasury Notes | 0.52% | 1.35% | 0.52% |
| U.S. Treasury Notes | 0.51% | 0.97% | 0.51% |
| U.S. Treasury Notes | 0.50% | 1.24% | 0.50% |
| U.S. Treasury Notes | 0.50% | 1.48% | 0.50% |
| U.S. Treasury Notes | 0.49% | 1.02% | 0.49% |
| U.S. Treasury Notes | 0.48% | 1.10% | 0.48% |
| U.S. Treasury Notes | 0.47% | 1.34% | 0.47% |
| U.S. Treasury Notes | 0.47% | 0.98% | 0.47% |
| U.S. Treasury Notes | 0.46% | 1.07% | 0.46% |
| U.S. Treasury Notes | 0.46% | 1.71% | 0.46% |
| U.S. Treasury Notes | 0.45% | 1.16% | 0.45% |
| U.S. Treasury Notes | 0.45% | 1.28% | 0.45% |
| U.S. Treasury Notes | 0.45% | 0.80% | 0.45% |
| U.S. Treasury Notes | 0.43% | 0.99% | 0.43% |
| U.S. Treasury Notes | 0.43% | 1.01% | 0.43% |
| U.S. Treasury Notes | 0.42% | 1.45% | 0.42% |
| U.S. Treasury Notes | 0.62% | 0.42% | 0.42% |
| U.S. Treasury Notes | 0.42% | 1.02% | 0.42% |
| U.S. Treasury Notes | 0.42% | 1.06% | 0.42% |
Frequently Asked Questions
How much do ISTB and SHY overlap?
ISTB and SHY overlap by 27.2% of portfolio weight. They share 86 holdings (ISTB holds 7059 positions and SHY holds 89), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ISTB and SHY?
The two portfolios are 27.2% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of ISTB and SHY?
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 20% of the total overlap.
What does ISTB own that SHY doesn't?
6973 positions (71.0% of ISTB) are unique to ISTB, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes. In the other direction, 3 positions (3.0% of SHY) are unique to SHY.