DFAT vs IBB: Holdings Overlap
DFATDimensional U.S. Targeted Value ETF
Dimensional · 1281 holdings · $14.5B · as of 2026-04-30
iShares · 254 holdings · $9.3B · as of 2026-03-31
Holdings snapshots are 30 days apart (DFAT: 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 DFAT and IBB?
Dimensional U.S. Targeted Value ETF (DFAT, by Dimensional) holds 1281 positions; iShares Biotechnology ETF (IBB, by iShares) holds 254. They have 19 holdings in common, and by portfolio weight the two funds are 0.6% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 19DFAT holds 1281 · IBB holds 254
- Weight in Shared Holdings
- DFAT 1%·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 DFAT
1262 of 1281 positions (99.2% of the fund) are not held by IBB. Showing the top 30 by weight.
Sector Breakdown
| Sector | DFAT | IBB |
|---|---|---|
| Health Care | 5.8% | 91.0% |
| Financials | 26.9% | 0.0% |
| Industrials | 16.5% | 0.0% |
| Consumer Discretionary | 12.9% | 0.0% |
| Energy | 10.8% | 0.0% |
| Other Sectors | 23.9% | 0.0% |
| Unclassified | 2.9% | 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 (3% of DFAT, 9% of IBB).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| DFAT | +3.8% | +21.7% | +34.5% | +15.0% | +11.7% | — | 1.33% |
| 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 DFAT vs IBB →
Shared Holdings(19)
The top 10 shared positions account for 99% of the overlap, led by CRL, VCYT and ALKS.
 CRLCharles River Laboratories International, Inc. COM | 0.26% | 0.77% | 0.26% |
|---|---|---|---|
 VCYTVeracyte Inc COM | 0.09% | 0.23% | 0.09% |
 ALKSAlkermes PLC COM USD0.01 | 0.08% | 0.53% | 0.08% |
 BMRNBiomarin Pharmaceutical Inc. COM | 0.06% | 0.98% | 0.06% |
 EBSEmergent Biosolutions Inc COM | 0.02% | 0.04% | 0.02% |
 CSTLCastle Biosciences Inc COM | 0.01% | 0.07% | 0.01% |
 CDNACaredx Inc COM | 0.01% | 0.07% | 0.01% |
 BRKRBruker Corporation COM | 0.01% | 0.34% | 0.01% |
| Black Diamond Therapeutics, Inc. | 0.00% | 0.01% | 0.00% |
 FTREFortrea Holdings Inc. COMMON STOCK | 0.00% | 0.08% | 0.00% |
 ACADAcadia Pharmaceuticals Inc COM | 0.00% | 0.34% | 0.00% |
 BCRXBioCryst Pharmaceuticals Inc. COM | 0.00% | 0.20% | 0.00% |
| OmniAb Inc. COM | 0.00% | 0.02% | 0.00% |
| Keros Therapeutics Inc. COM | 0.00% | 0.03% | 0.00% |
 ALMSAlumis Inc COM | 0.00% | 0.14% | 0.00% |
| Design Therapeutics Inc. COM | 0.00% | 0.03% | 0.00% |
 2200964DOmniAb Inc. USD0.0001 A (USD15 VESTING) | 0.00% | 0.00% | 0.00% |
| Third Harmonic Bio Inc COM | 0.00% | 0.00% | 0.00% |
 2200963DOmniAb Inc. USD0.0001 A (USD12.5 VESTING) | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
How much do DFAT and IBB overlap?
DFAT and IBB overlap by 0.6% of portfolio weight. They share 19 holdings (DFAT holds 1281 positions and IBB holds 254), based on each fund's latest SEC-reported holdings.
Is it redundant to own both DFAT and IBB?
The two portfolios are 0.6% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of DFAT and IBB?
The largest positions held by both funds are CRL, VCYT, ALKS, BMRN and EBS. Together the top 10 shared positions account for 99% of the total overlap.
What does DFAT own that IBB doesn't?
1262 positions (99.2% of DFAT) are unique to DFAT, led by PR, WCC and CF. In the other direction, 235 positions (96.0% of IBB) are unique to IBB.