ISTB vs BSV: Holdings Overlap
ISTBiShares Core 1-5 Year USD Bond ETF
iShares · 7059 holdings · $5.1B · as of 2026-04-30
BSVVanguard Short-term Bond Index Fund
Vanguard · 3156 holdings · $45.6B · as of 2026-03-31
Holdings snapshots are 30 days apart (ISTB: 2026-04-30, BSV: 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 ISTB and BSV?
iShares Core 1-5 Year USD Bond ETF (ISTB, by iShares) holds 7059 positions; Vanguard Short-term Bond Index Fund (BSV, by Vanguard) holds 3156. They have 2962 holdings in common, and by portfolio weight the two funds are 62.2% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 62.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 2962ISTB holds 7059 · BSV holds 3156
- Weight in Shared Holdings
- ISTB 72%·BSV 90%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
4097 of 7059 positions (27.0% of the fund) are not held by BSV. Showing the top 30 by weight.
- U.S. Treasury Notes0.54%
- U.S. Treasury Notes0.46%
- Freddie Mac Multifamily Structured Pass Through Certificates0.21%
- Uniform Mortgage-Backed Security, TBA0.20%
- Benchmark 2023-B38 Mortgage Trust0.15%
- Fannie Mae Pool0.13%
Only in BSV
194 of 3156 positions (8.4% of the fund) are not held by ISTB. Showing the top 30 by weight.
- U.S. Treasury Notes0.82%
- U.S. Treasury Notes0.76%
- U.S. Treasury Notes0.75%
- U.S. Treasury Notes0.57%
- U.S. Treasury Notes0.48%
- U.S. Treasury Notes0.40%
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% |
| BSV | +0.3% | +0.7% | +2.7% | +4.5% | +1.7% | +1.9% | 4.03% |
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 BSV →
Shared Holdings(2962)
The top 10 shared positions account for 11% of the overlap, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes.
| U.S. Treasury Notes | 0.99% | 0.92% | 0.92% |
|---|---|---|---|
| U.S. Treasury Notes | 0.98% | 0.79% | 0.79% |
| U.S. Treasury Notes | 0.80% | 0.76% | 0.76% |
| U.S. Treasury Notes | 0.81% | 0.72% | 0.72% |
| U.S. Treasury Notes | 0.70% | 0.74% | 0.70% |
| U.S. Treasury Notes | 0.86% | 0.68% | 0.68% |
| U.S. Treasury Notes | 0.68% | 0.65% | 0.65% |
| U.S. Treasury Notes | 0.73% | 0.65% | 0.65% |
| U.S. Treasury Notes | 0.64% | 0.65% | 0.64% |
| U.S. Treasury Notes | 0.91% | 0.63% | 0.63% |
| U.S. Treasury Notes | 0.89% | 0.63% | 0.63% |
| U.S. Treasury Notes | 0.62% | 0.76% | 0.62% |
| U.S. Treasury Notes | 0.83% | 0.60% | 0.60% |
| U.S. Treasury Notes | 0.71% | 0.58% | 0.58% |
| U.S. Treasury Notes | 0.64% | 0.57% | 0.57% |
| U.S. Treasury Notes | 0.60% | 0.56% | 0.56% |
| U.S. Treasury Notes | 0.56% | 0.75% | 0.56% |
| U.S. Treasury Notes | 0.54% | 0.78% | 0.54% |
| U.S. Treasury Notes | 0.59% | 0.54% | 0.54% |
| U.S. Treasury Notes | 0.58% | 0.53% | 0.53% |
| U.S. Treasury Notes | 0.52% | 0.53% | 0.52% |
| U.S. Treasury Notes | 0.50% | 0.52% | 0.50% |
| U.S. Treasury Notes | 0.50% | 0.62% | 0.50% |
| U.S. Treasury Notes | 0.67% | 0.49% | 0.49% |
| U.S. Treasury Notes | 0.55% | 0.49% | 0.49% |
Showing the top 250 of 2962 shared holdings by overlap weight.
Frequently Asked Questions
How much do ISTB and BSV overlap?
ISTB and BSV overlap by 62.2% of portfolio weight. They share 2962 holdings (ISTB holds 7059 positions and BSV holds 3156), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ISTB and BSV?
The two portfolios are 62.2% 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 ISTB and BSV?
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 11% of the total overlap.
What does ISTB own that BSV doesn't?
4097 positions (27.0% of ISTB) are unique to ISTB, led by U.S. Treasury Notes, U.S. Treasury Notes and Freddie Mac Multifamily Structured Pass Through Certificates. In the other direction, 194 positions (8.4% of BSV) are unique to BSV.