DFAS vs IWM: Holdings Overlap
DFASDimensional U.S. Small Cap ETF
Dimensional · 2121 holdings · $15.3B · as of 2026-04-30
iShares · 1941 holdings · $82.2B · as of 2026-03-31
Holdings snapshots are 30 days apart (DFAS: 2026-04-30, IWM: 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 DFAS and IWM?
Dimensional U.S. Small Cap ETF (DFAS, by Dimensional) holds 2121 positions; iShares Russell 2000 ETF (IWM, by iShares) holds 1941. They have 1456 holdings in common, and by portfolio weight the two funds are 55.0% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 55.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 1456DFAS holds 2121 · IWM holds 1941
- Weight in Shared Holdings
- DFAS 57%·IWM 79%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 DFAS
665 of 2121 positions (42.8% of the fund) are not held by IWM. Showing the top 30 by weight.
Sector Breakdown
| Sector | DFAS | IWM |
|---|---|---|
| Industrials | 20.6% | 17.9% |
| Financials | 19.2% | 15.3% |
| Health Care | 11.1% | 16.6% |
| Information Technology | 12.0% | 13.6% |
| Consumer Discretionary | 12.4% | 8.0% |
| Other Sectors | 21.9% | 22.7% |
| Unclassified | 2.7% | 5.5% |
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 DFAS, 5% of IWM).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| DFAS | +3.2% | +20.5% | +31.3% | +14.8% | +9.1% | — | 0.95% |
| IWM | +1.8% | +23.0% | +38.6% | +17.1% | +7.5% | +10.8% | 0.88% |
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 DFAS vs IWM →
Shared Holdings(1456)
The top 10 shared positions account for 5% of the overlap, led by TTMI, AEIS and MOD.
 TTMITTM Technologies Inc COM | 0.34% | 0.34% | 0.34% |
|---|---|---|---|
 AEISAdvanced Energy Industries, Inc. COM | 0.29% | 0.41% | 0.29% |
 MODModine Manufacturing Co. COM | 0.28% | 0.39% | 0.28% |
 RMBSRambus Inc. COM | 0.24% | 0.32% | 0.24% |
 SANMSanmina Corporation | 0.24% | 0.24% | 0.24% |
 HLHecla Mining Company COM | 0.23% | 0.40% | 0.23% |
 VIAVViavi Solutions Inc COM | 0.23% | 0.26% | 0.23% |
 ENSGEnsign Group, Inc. (The) | 0.22% | 0.38% | 0.22% |
 FCFSFirstcash Holdings Inc COM | 0.21% | 0.25% | 0.21% |
 FORMFormfactor Inc COM | 0.21% | 0.26% | 0.21% |
 SPXCSPX Technologies, Inc. COM | 0.21% | 0.33% | 0.21% |
 PLPlanet Labs PBC, Class A | 0.20% | 0.26% | 0.20% |
 PRIMPrimoris Services Corp. COM | 0.20% | 0.26% | 0.20% |
 STRLSterling Infrastructure Inc COM | 0.20% | 0.41% | 0.20% |
 UMBFUMB Financial Corporation | 0.19% | 0.28% | 0.19% |
 KTOSKratos Defense & Security Solutions, Inc. COM NEW | 0.19% | 0.43% | 0.19% |
 SNEXStoneX Group Inc COM | 0.19% | 0.20% | 0.19% |
 AGXArgan Inc COM | 0.18% | 0.25% | 0.18% |
 JXNJackson Financial, Inc., Class A | 0.18% | 0.24% | 0.18% |
 FLRFluor Corporation COM | 0.18% | 0.26% | 0.18% |
 DYDycom Industries, Inc. COM | 0.18% | 0.34% | 0.18% |
 ONBOld National Bancorp COM | 0.18% | 0.26% | 0.18% |
 ENSEnerSys COM | 0.18% | 0.22% | 0.18% |
 MOG-AMoog, Inc., Class A | 0.18% | 0.28% | 0.18% |
 POWLPowell Industries Inc. COM | 0.21% | 0.18% | 0.18% |
Showing the top 250 of 1456 shared holdings by overlap weight.
Frequently Asked Questions
How much do DFAS and IWM overlap?
DFAS and IWM overlap by 55.0% of portfolio weight. They share 1456 holdings (DFAS holds 2121 positions and IWM holds 1941), based on each fund's latest SEC-reported holdings.
Is it redundant to own both DFAS and IWM?
The two portfolios are 55.0% 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 DFAS and IWM?
The largest positions held by both funds are TTMI, AEIS, MOD, RMBS and SANM. Together the top 10 shared positions account for 5% of the total overlap.
What does DFAS own that IWM doesn't?
665 positions (42.8% of DFAS) are unique to DFAS, led by AMKR, WCC and ONTO. In the other direction, 485 positions (20.7% of IWM) are unique to IWM.