IUSB vs BND: Holdings Overlap
IUSBiShares Core Universal USD Bond ETF
iShares · 17783 holdings · $43.2B · as of 2026-04-30
BNDVanguard Total Bond Market Index Fund
Vanguard · 17360 holdings · $161.4B · as of 2026-03-31
Holdings snapshots are 30 days apart (IUSB: 2026-04-30, BND: 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 BND?
iShares Core Universal USD Bond ETF (IUSB, by iShares) holds 17783 positions; Vanguard Total Bond Market Index Fund (BND, by Vanguard) holds 17360. They have 9018 holdings in common, and by portfolio weight the two funds are 57.8% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 57.8%Sum of the smaller weight of each shared holding
- Shared Holdings
- 9018IUSB holds 17783 · BND holds 17360
- Weight in Shared Holdings
- IUSB 68%·BND 80%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
8765 of 17783 positions (30.1% of the fund) are not held by BND. Showing the top 30 by weight.
- Uniform Mortgage-Backed Securities0.22%
- Uniform Mortgage-Backed Securities0.20%
- Government National Mortgage Association0.18%
- Uniform Mortgage-Backed Securities0.13%
- U.S. Treasury Notes0.12%
- Uniform Mortgage-Backed Securities0.11%
Only in BND
8342 of 17360 positions (18.9% of the fund) are not held by IUSB. Showing the top 30 by weight.
- U.S. Treasury Notes0.21%
- U.S. Treasury Notes0.18%
- U.S. Treasury Notes0.18%
- U.S. Treasury Notes0.16%
- U.S. Treasury Notes0.15%
- U.S. Treasury Notes0.13%
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% |
| BND | -0.3% | +0.0% | +2.4% | +4.2% | -0.2% | +1.5% | 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 BND →
Shared Holdings(9018)
The top 10 shared positions account for 6% of the overlap, led by U.S. Treasury Notes, U.S. Treasury Notes and U.S. Treasury Notes.
| U.S. Treasury Notes | 0.37% | 0.42% | 0.37% |
|---|---|---|---|
| U.S. Treasury Notes | 0.37% | 0.42% | 0.37% |
| U.S. Treasury Notes | 0.37% | 0.41% | 0.37% |
| U.S. Treasury Notes | 0.36% | 0.36% | 0.36% |
| U.S. Treasury Notes | 0.36% | 0.40% | 0.36% |
| U.S. Treasury Notes | 0.36% | 0.41% | 0.36% |
| U.S. Treasury Notes | 0.37% | 0.35% | 0.35% |
| U.S. Treasury Notes | 0.35% | 0.39% | 0.35% |
| U.S. Treasury Notes | 0.34% | 0.39% | 0.34% |
| U.S. Treasury Notes | 0.33% | 0.36% | 0.33% |
| U.S. Treasury Notes | 0.31% | 0.32% | 0.31% |
| U.S. Treasury Notes | 0.27% | 0.34% | 0.27% |
| U.S. Treasury Notes | 0.27% | 0.48% | 0.27% |
| U.S. Treasury Notes | 0.26% | 0.32% | 0.26% |
| U.S. Treasury Notes | 0.26% | 0.35% | 0.26% |
| U.S. Treasury Notes | 0.25% | 0.32% | 0.25% |
| U.S. Treasury Notes | 0.25% | 0.32% | 0.25% |
| U.S. Treasury Notes | 0.25% | 0.36% | 0.25% |
| U.S. Treasury Notes | 0.24% | 0.31% | 0.24% |
| U.S. Treasury Notes | 0.33% | 0.24% | 0.24% |
| U.S. Treasury Notes | 0.31% | 0.24% | 0.24% |
| U.S. Treasury Notes | 0.34% | 0.24% | 0.24% |
| U.S. Treasury Notes | 0.27% | 0.24% | 0.24% |
| U.S. Treasury Notes | 0.26% | 0.23% | 0.23% |
| U.S. Treasury Notes | 0.28% | 0.22% | 0.22% |
Showing the top 250 of 9018 shared holdings by overlap weight.
Frequently Asked Questions
How much do IUSB and BND overlap?
IUSB and BND overlap by 57.8% of portfolio weight. They share 9018 holdings (IUSB holds 17783 positions and BND holds 17360), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IUSB and BND?
The two portfolios are 57.8% identical by weight. Owning both is defensible: they share a meaningful core, but each fund adds exposure the other lacks.
What are the biggest shared holdings of IUSB and BND?
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 6% of the total overlap.
What does IUSB own that BND doesn't?
8765 positions (30.1% of IUSB) are unique to IUSB, led by Uniform Mortgage-Backed Securities, Uniform Mortgage-Backed Securities and Government National Mortgage Association. In the other direction, 8342 positions (18.9% of BND) are unique to BND.