DFAI vs IBB: Holdings Overlap
DFAIDimensional International Core Equity Market ETF
Dimensional · 3726 holdings · $17.5B · as of 2026-04-30
iShares · 254 holdings · $9.3B · as of 2026-03-31
Holdings snapshots are 30 days apart (DFAI: 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 DFAI and IBB?
Dimensional International Core Equity Market ETF (DFAI, by Dimensional) holds 3726 positions; iShares Biotechnology ETF (IBB, by iShares) holds 254. They have 2 holdings in common, and by portfolio weight the two funds are 0.1% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 2DFAI holds 3726 · IBB holds 254
- Weight in Shared Holdings
- DFAI 0%·IBB 4%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 DFAI
3724 of 3726 positions (99.2% of the fund) are not held by IBB. Showing the top 30 by weight.
Sector Breakdown
| Sector | DFAI | IBB |
|---|---|---|
| Health Care | 7.2% | 91.0% |
| Financials | 20.2% | 0.0% |
| Industrials | 13.8% | 0.0% |
| Materials | 7.1% | 0.0% |
| Information Technology | 6.9% | 0.0% |
| Other Sectors | 23.3% | 0.0% |
| Unclassified | 20.8% | 8.9% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts. “Unclassified” is weight we could not classify (21% of DFAI, 9% of IBB).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| DFAI | +4.2% | +15.2% | +26.8% | +19.3% | +10.7% | — | 2.24% |
| 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 DFAI vs IBB →
Shared Holdings(2)
 ARGXargenx SE, ADR | 0.06% | 3.07% | 0.06% |
|---|---|---|---|
 GMABGenmab A/S | 0.00% | 1.17% | 0.00% |
Frequently Asked Questions
How much do DFAI and IBB overlap?
DFAI and IBB overlap by 0.1% of portfolio weight. They share 2 holdings (DFAI holds 3726 positions and IBB holds 254), based on each fund's latest SEC-reported holdings.
Is it redundant to own both DFAI and IBB?
The two portfolios are 0.1% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of DFAI and IBB?
The largest positions held by both funds are ARGX and GMAB. Together the top 2 shared positions account for 100% of the total overlap.
What does DFAI own that IBB doesn't?
3724 positions (99.2% of DFAI) are unique to DFAI, led by ASML, SHEL and HSBA. In the other direction, 252 positions (95.6% of IBB) are unique to IBB.