IUSB vs BSV: Holdings Overlap
IUSBiShares Core Universal USD Bond ETF
iShares · 17783 holdings · $43.2B · 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 (IUSB: 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 IUSB and BSV?
iShares Core Universal USD Bond ETF (IUSB, by iShares) holds 17783 positions; Vanguard Short-term Bond Index Fund (BSV, by Vanguard) holds 3156. They have 3071 holdings in common, and by portfolio weight the two funds are 30.0% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 30.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 3071IUSB holds 17783 · BSV holds 3156
- Weight in Shared Holdings
- IUSB 31%·BSV 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 IUSB
14712 of 17783 positions (67.4% of the fund) are not held by BSV. Showing the top 30 by weight.
- U.S. Treasury Notes0.37%
- U.S. Treasury Notes0.37%
- U.S. Treasury Notes0.37%
- U.S. Treasury Notes0.36%
- U.S. Treasury Notes0.36%
- U.S. Treasury Notes0.36%
Only in BSV
85 of 3156 positions (2.0% of the fund) are not held by IUSB. Showing the top 30 by weight.
- U.S. Treasury Notes0.38%
- U.S. Treasury Notes0.38%
- U.S. Treasury Notes0.31%
- U.S. Treasury Notes0.26%
- Federal Home Loan Bank Bonds0.06%
- UBS AG/Stamford CT0.04%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IUSB | -0.2% | +0.3% | +2.8% | +4.7% | +0.2% | +1.8% | 4.28% |
| 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 IUSB vs BSV →
Shared Holdings(3071)
The top 10 shared positions account for 10% of the overlap, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes.
| U.S. Treasury Notes | 0.37% | 0.92% | 0.37% |
|---|---|---|---|
| U.S. Treasury Notes | 0.34% | 0.45% | 0.34% |
| U.S. Treasury Notes | 0.33% | 0.79% | 0.33% |
| U.S. Treasury Notes | 0.31% | 0.42% | 0.31% |
| U.S. Treasury Notes | 0.31% | 0.76% | 0.31% |
| U.S. Treasury Notes | 0.30% | 0.41% | 0.30% |
| U.S. Treasury Notes | 0.29% | 0.65% | 0.29% |
| U.S. Treasury Notes | 0.29% | 0.80% | 0.29% |
| U.S. Treasury Notes | 0.28% | 0.63% | 0.28% |
| U.S. Treasury Notes | 0.28% | 0.68% | 0.28% |
| U.S. Treasury Notes | 0.27% | 0.65% | 0.27% |
| U.S. Treasury Notes | 0.27% | 1.16% | 0.27% |
| U.S. Treasury Notes | 0.26% | 0.60% | 0.26% |
| U.S. Treasury Notes | 0.26% | 0.75% | 0.26% |
| U.S. Treasury Notes | 0.26% | 0.55% | 0.26% |
| U.S. Treasury Notes | 0.25% | 0.78% | 0.25% |
| U.S. Treasury Notes | 0.25% | 0.73% | 0.25% |
| U.S. Treasury Notes | 0.24% | 0.56% | 0.24% |
| U.S. Treasury Notes | 0.24% | 0.62% | 0.24% |
| U.S. Treasury Notes | 0.24% | 0.43% | 0.24% |
| U.S. Treasury Notes | 0.23% | 0.35% | 0.23% |
| U.S. Treasury Notes | 0.23% | 0.63% | 0.23% |
| U.S. Treasury Notes | 0.32% | 0.23% | 0.23% |
| U.S. Treasury Notes | 0.23% | 0.47% | 0.23% |
| U.S. Treasury Notes | 0.22% | 0.34% | 0.22% |
Showing the top 250 of 3071 shared holdings by overlap weight.
Frequently Asked Questions
How much do IUSB and BSV overlap?
IUSB and BSV overlap by 30.0% of portfolio weight. They share 3071 holdings (IUSB holds 17783 positions and BSV holds 3156), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IUSB and BSV?
The two portfolios are 30.0% 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 IUSB 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 10% of the total overlap.
What does IUSB own that BSV doesn't?
14712 positions (67.4% of IUSB) are unique to IUSB, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes. In the other direction, 85 positions (2.0% of BSV) are unique to BSV.