ISTB vs VGSH: Holdings Overlap
ISTBiShares Core 1-5 Year USD Bond ETF
iShares · 7059 holdings · $5.1B · as of 2026-04-30
VGSHVanguard Short-term Treasury Index Fund
Vanguard · 91 holdings · $30.2B · as of 2026-05-31
Holdings snapshots are 31 days apart (ISTB: 2026-04-30, VGSH: 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 VGSH?
iShares Core 1-5 Year USD Bond ETF (ISTB, by iShares) holds 7059 positions; Vanguard Short-term Treasury Index Fund (VGSH, by Vanguard) holds 91. They have 88 holdings in common, and by portfolio weight the two funds are 28.3% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 28.3%Sum of the smaller weight of each shared holding
- Shared Holdings
- 88ISTB holds 7059 · VGSH holds 91
- Weight in Shared Holdings
- ISTB 28%·VGSH 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
6971 of 7059 positions (70.3% of the fund) are not held by VGSH. 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 VGSH
3 of 91 positions (2.8% of the fund) are not held by ISTB.
- U.S. Treasury Notes1.02%
- U.S. Treasury Notes0.99%
- U.S. Treasury Notes0.82%
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% |
| VGSH | +0.4% | +1.0% | +2.9% | +4.3% | +1.9% | +1.8% | 3.82% |
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 VGSH →
Shared Holdings(88)
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% | 1.29% | 0.64% |
|---|---|---|---|
| U.S. Treasury Notes | 0.62% | 0.83% | 0.62% |
| U.S. Treasury Notes | 0.60% | 1.11% | 0.60% |
| U.S. Treasury Notes | 0.59% | 1.31% | 0.59% |
| U.S. Treasury Notes | 0.58% | 1.26% | 0.58% |
| U.S. Treasury Notes | 0.57% | 1.16% | 0.57% |
| U.S. Treasury Notes | 0.55% | 1.20% | 0.55% |
| U.S. Treasury Notes | 0.55% | 1.25% | 0.55% |
| U.S. Treasury Notes | 0.52% | 1.25% | 0.52% |
| U.S. Treasury Notes | 0.51% | 0.81% | 0.51% |
| U.S. Treasury Notes | 0.50% | 1.19% | 0.50% |
| U.S. Treasury Notes | 0.50% | 1.26% | 0.50% |
| U.S. Treasury Notes | 0.49% | 0.97% | 0.49% |
| U.S. Treasury Notes | 0.48% | 1.03% | 0.48% |
| U.S. Treasury Notes | 0.47% | 1.17% | 0.47% |
| U.S. Treasury Notes | 0.47% | 1.06% | 0.47% |
| U.S. Treasury Notes | 0.46% | 0.89% | 0.46% |
| U.S. Treasury Notes | 0.46% | 2.24% | 0.46% |
| U.S. Treasury Notes | 0.45% | 1.19% | 0.45% |
| U.S. Treasury Notes | 0.45% | 1.25% | 0.45% |
| U.S. Treasury Notes | 0.45% | 1.01% | 0.45% |
| U.S. Treasury Notes | 0.45% | 1.20% | 0.45% |
| U.S. Treasury Notes | 0.43% | 0.78% | 0.43% |
| U.S. Treasury Notes | 0.43% | 0.91% | 0.43% |
| U.S. Treasury Notes | 0.42% | 1.00% | 0.42% |
Frequently Asked Questions
How much do ISTB and VGSH overlap?
ISTB and VGSH overlap by 28.3% of portfolio weight. They share 88 holdings (ISTB holds 7059 positions and VGSH holds 91), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ISTB and VGSH?
The two portfolios are 28.3% 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 VGSH?
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 VGSH doesn't?
6971 positions (70.3% 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 (2.8% of VGSH) are unique to VGSH.