SHY vs ISTB: Holdings Overlap
SHYiShares 1-3 Year Treasury Bond ETF
iShares · 89 holdings · $25.2B · as of 2026-05-31
ISTBiShares Core 1-5 Year USD Bond ETF
iShares · 7059 holdings · $5.1B · as of 2026-04-30
Holdings snapshots are 31 days apart (SHY: 2026-05-31, ISTB: 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 SHY and ISTB?
iShares 1-3 Year Treasury Bond ETF (SHY, by iShares) holds 89 positions; iShares Core 1-5 Year USD Bond ETF (ISTB, by iShares) holds 7059. 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
- 86SHY holds 89 · ISTB holds 7059
- Weight in Shared Holdings
- SHY 96%·ISTB 28%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 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%
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%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| SHY | +0.4% | +1.0% | +2.8% | +4.2% | +1.8% | +1.7% | 3.63% |
| ISTB | +0.3% | +1.0% | +3.0% | +5.0% | +1.9% | +2.3% | 4.27% |
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 SHY vs ISTB →
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 | 1.36% | 0.64% | 0.64% |
|---|---|---|---|
| U.S. Treasury Notes | 1.32% | 0.60% | 0.60% |
| U.S. Treasury Notes | 1.29% | 0.59% | 0.59% |
| U.S. Treasury Notes | 1.84% | 0.58% | 0.58% |
| U.S. Treasury Notes | 1.33% | 0.55% | 0.55% |
| U.S. Treasury Notes | 1.34% | 0.55% | 0.55% |
| U.S. Treasury Notes | 1.35% | 0.52% | 0.52% |
| U.S. Treasury Notes | 0.97% | 0.51% | 0.51% |
| U.S. Treasury Notes | 1.24% | 0.50% | 0.50% |
| U.S. Treasury Notes | 1.48% | 0.50% | 0.50% |
| U.S. Treasury Notes | 1.02% | 0.49% | 0.49% |
| U.S. Treasury Notes | 1.10% | 0.48% | 0.48% |
| U.S. Treasury Notes | 1.34% | 0.47% | 0.47% |
| U.S. Treasury Notes | 0.98% | 0.47% | 0.47% |
| U.S. Treasury Notes | 1.07% | 0.46% | 0.46% |
| U.S. Treasury Notes | 1.71% | 0.46% | 0.46% |
| U.S. Treasury Notes | 1.16% | 0.45% | 0.45% |
| U.S. Treasury Notes | 1.28% | 0.45% | 0.45% |
| U.S. Treasury Notes | 0.80% | 0.45% | 0.45% |
| U.S. Treasury Notes | 0.99% | 0.43% | 0.43% |
| U.S. Treasury Notes | 1.01% | 0.43% | 0.43% |
| U.S. Treasury Notes | 1.45% | 0.42% | 0.42% |
| U.S. Treasury Notes | 0.42% | 0.62% | 0.42% |
| U.S. Treasury Notes | 1.02% | 0.42% | 0.42% |
| U.S. Treasury Notes | 1.06% | 0.42% | 0.42% |
Frequently Asked Questions
How much do SHY and ISTB overlap?
SHY and ISTB overlap by 27.2% of portfolio weight. They share 86 holdings (SHY holds 89 positions and ISTB holds 7059), based on each fund's latest SEC-reported holdings.
Is it redundant to own both SHY and ISTB?
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 SHY and ISTB?
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 SHY own that ISTB doesn't?
3 positions (3.0% of SHY) are unique to SHY, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes. In the other direction, 6973 positions (71.0% of ISTB) are unique to ISTB.