IWO vs OIH: Holdings Overlap
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
VanEck · 25 holdings · $1.9B · as of 2026-03-31
How similar are IWO and OIH?
iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101 positions; VanEck Oil Services ETF (OIH, by VanEck) holds 25. They have 6 holdings in common, and by portfolio weight the two funds are 0.9% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.9%Sum of the smaller weight of each shared holding
- Shared Holdings
- 6IWO holds 1101 · OIH holds 25
- Weight in Shared Holdings
- IWO 1%·OIH 14%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 IWO
1095 of 1101 positions (98.9% of the fund) are not held by OIH. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWO | OIH |
|---|---|---|
| Energy | 3.6% | 99.9% |
| Industrials | 23.7% | 0.0% |
| Health Care | 23.1% | 0.0% |
| Information Technology | 19.0% | 0.0% |
| Financials | 8.6% | 0.0% |
| Other Sectors | 17.8% | 0.0% |
| Unclassified | 4.0% | 0.0% |
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 (4% of IWO, 0% of OIH).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWO | +1.2% | +21.0% | +34.7% | +17.5% | +5.9% | +11.0% | 0.42% |
| OIH | +6.0% | +36.4% | +67.5% | +6.4% | +17.5% | -2.1% | 1.25% |
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 IWO vs OIH →
Shared Holdings(6)
The top 6 shared positions account for 100% of the overlap, led by TDW, WHD and OII.
 TDWTidewater, Inc. | 0.26% | 2.69% | 0.26% |
|---|---|---|---|
 WHDCactus, Inc., Class A | 0.22% | 2.40% | 0.22% |
 OIIOceaneering International, Inc. | 0.21% | 2.72% | 0.21% |
 SEISolaris Energy Infrastructure, Inc., Class A | 0.18% | 3.00% | 0.18% |
 HLXHelix Energy Solutions Group, Inc. | 0.02% | 1.14% | 0.02% |
 WTTRSelect Water Solutions, Inc., Class A | 0.00% | 1.63% | 0.00% |
Frequently Asked Questions
How much do IWO and OIH overlap?
IWO and OIH overlap by 0.9% of portfolio weight. They share 6 holdings (IWO holds 1101 positions and OIH holds 25), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWO and OIH?
The two portfolios are 0.9% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IWO and OIH?
The largest positions held by both funds are TDW, WHD, OII, SEI and HLX. Together the top 6 shared positions account for 100% of the total overlap.
What does IWO own that OIH doesn't?
1095 positions (98.9% of IWO) are unique to IWO, led by BE, FN and CRDO. In the other direction, 19 positions (86.3% of OIH) are unique to OIH.