DFAX vs IBB: Holdings Overlap
DFAXDimensional World ex. U.S. Core Equity 2 ETF
Dimensional · 10527 holdings · $12.0B · as of 2026-04-30
iShares · 254 holdings · $9.3B · as of 2026-03-31
Holdings snapshots are 30 days apart (DFAX: 2026-04-30, IBB: 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 DFAX and IBB?
Dimensional World ex. U.S. Core Equity 2 ETF (DFAX, by Dimensional) holds 10527 positions; iShares Biotechnology ETF (IBB, by iShares) holds 254. They have 4 holdings in common, and by portfolio weight the two funds are 0.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 4DFAX holds 10527 · IBB holds 254
- Weight in Shared Holdings
- DFAX 0%·IBB 6%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 DFAX
10523 of 10527 positions (99.6% of the fund) are not held by IBB. Showing the top 30 by weight.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| DFAX | +3.5% | +17.0% | +29.0% | +20.1% | — | — | 2.27% |
| IBB | -0.3% | +17.3% | +51.0% | +16.4% | +3.1% | +7.4% | 0.21% |
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 DFAX vs IBB →
Shared Holdings(4)
The top 4 shared positions account for 100% of the overlap, led by ARGX, ONC and ZLAB.
Frequently Asked Questions
How much do DFAX and IBB overlap?
DFAX and IBB overlap by 0.0% of portfolio weight. They share 4 holdings (DFAX holds 10527 positions and IBB holds 254), based on each fund's latest SEC-reported holdings.
Is it redundant to own both DFAX and IBB?
The two portfolios are 0.0% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of DFAX and IBB?
The largest positions held by both funds are ARGX, ONC, ZLAB and GMAB. Together the top 4 shared positions account for 100% of the total overlap.
What does DFAX own that IBB doesn't?
10523 positions (99.6% of DFAX) are unique to DFAX, led by TSMWF, 005930 and TSM. In the other direction, 250 positions (93.5% of IBB) are unique to IBB.