BIV vs IUSB: Holdings Overlap
BIVVanguard Intermediate-term Bond Index Fund
Vanguard · 2340 holdings · $28.9B · as of 2026-03-31
IUSBiShares Core Universal USD Bond ETF
iShares · 17783 holdings · $43.2B · as of 2026-04-30
Holdings snapshots are 30 days apart (BIV: 2026-03-31, IUSB: 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 BIV and IUSB?
Vanguard Intermediate-term Bond Index Fund (BIV, by Vanguard) holds 2340 positions; iShares Core Universal USD Bond ETF (IUSB, by iShares) holds 17783. They have 2296 holdings in common, and by portfolio weight the two funds are 15.5% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 15.5%Sum of the smaller weight of each shared holding
- Shared Holdings
- 2296BIV holds 2340 · IUSB holds 17783
- Weight in Shared Holdings
- BIV 98%·IUSB 16%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 BIV
44 of 2340 positions (0.5% of the fund) are not held by IUSB. Showing the top 30 by weight.
- Corp Andina de Fomento0.04%
- Federal Home Loan Bank Bonds0.03%
- Micron Technology Inc0.03%
- Blackrock Inc0.02%
- BlackRock Funding Inc0.02%
- Micron Technology Inc0.02%
Only in IUSB
15487 of 17783 positions (82.7% of the fund) are not held by BIV. Showing the top 30 by weight.
- U.S. Treasury Notes0.37%
- U.S. Treasury Notes0.34%
- U.S. Treasury Notes0.33%
- U.S. Treasury Notes0.32%
- Uniform Mortgage-Backed Securities0.32%
- U.S. Treasury Notes0.31%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| BIV | -0.2% | -0.3% | +2.0% | +4.6% | -0.1% | +1.7% | 4.31% |
| IUSB | -0.2% | +0.3% | +2.8% | +4.7% | +0.2% | +1.8% | 4.28% |
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 BIV vs IUSB →
Shared Holdings(2296)
The top 10 shared positions account for 23% of the overlap, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes.
| U.S. Treasury Notes | 2.03% | 0.37% | 0.37% |
|---|---|---|---|
| U.S. Treasury Notes | 2.18% | 0.37% | 0.37% |
| U.S. Treasury Notes | 2.06% | 0.37% | 0.37% |
| U.S. Treasury Notes | 2.02% | 0.36% | 0.36% |
| U.S. Treasury Notes | 2.29% | 0.36% | 0.36% |
| U.S. Treasury Notes | 2.06% | 0.36% | 0.36% |
| U.S. Treasury Notes | 2.19% | 0.35% | 0.35% |
| U.S. Treasury Notes | 1.99% | 0.34% | 0.34% |
| U.S. Treasury Notes | 1.95% | 0.33% | 0.33% |
| U.S. Treasury Notes | 1.88% | 0.33% | 0.33% |
| U.S. Treasury Notes | 0.92% | 0.29% | 0.29% |
| U.S. Treasury Notes | 0.71% | 0.29% | 0.29% |
| U.S. Treasury Notes | 2.20% | 0.27% | 0.27% |
| U.S. Treasury Notes | 1.67% | 0.26% | 0.26% |
| U.S. Treasury Notes | 1.75% | 0.26% | 0.26% |
| U.S. Treasury Notes | 1.72% | 0.25% | 0.25% |
| U.S. Treasury Notes | 1.61% | 0.25% | 0.25% |
| U.S. Treasury Notes | 1.68% | 0.25% | 0.25% |
| U.S. Treasury Notes | 1.64% | 0.21% | 0.21% |
| U.S. Treasury Notes | 1.55% | 0.21% | 0.21% |
| U.S. Treasury Notes | 1.77% | 0.20% | 0.20% |
| U.S. Treasury Notes | 0.21% | 0.17% | 0.17% |
| U.S. Treasury Notes | 1.40% | 0.15% | 0.15% |
| U.S. Treasury Notes | 0.72% | 0.15% | 0.15% |
| U.S. Treasury Notes | 0.73% | 0.14% | 0.14% |
Showing the top 250 of 2296 shared holdings by overlap weight.
Frequently Asked Questions
How much do BIV and IUSB overlap?
BIV and IUSB overlap by 15.5% of portfolio weight. They share 2296 holdings (BIV holds 2340 positions and IUSB holds 17783), based on each fund's latest SEC-reported holdings.
Is it redundant to own both BIV and IUSB?
The two portfolios are 15.5% 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 BIV and IUSB?
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 23% of the total overlap.
What does BIV own that IUSB doesn't?
44 positions (0.5% of BIV) are unique to BIV, led by Corp Andina de Fomento, Federal Home Loan Bank Bonds and Micron Technology Inc. In the other direction, 15487 positions (82.7% of IUSB) are unique to IUSB.