IWO vs VOX: Holdings Overlap
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
VOXVanguard Communication Services Index Fund
Vanguard · 114 holdings · $5.9B · as of 2026-05-31
Holdings snapshots are 61 days apart (IWO: 2026-03-31, VOX: 2026-05-31). 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 IWO and VOX?
iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101 positions; Vanguard Communication Services Index Fund (VOX, by Vanguard) holds 114. They have 34 holdings in common, and by portfolio weight the two funds are 2.1% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 2.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 34IWO holds 1101 · VOX holds 114
- Weight in Shared Holdings
- IWO 2%·VOX 3%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
1067 of 1101 positions (97.6% of the fund) are not held by VOX. Showing the top 30 by weight.
Only in VOX
80 of 114 positions (96.9% of the fund) are not held by IWO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWO | VOX |
|---|---|---|
| Communication Services | 2.3% | 99.7% |
| Industrials | 23.7% | 0.0% |
| Health Care | 23.1% | 0.0% |
| Information Technology | 19.0% | 0.0% |
| Financials | 8.6% | 0.0% |
| Other Sectors | 19.2% | 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 VOX).
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% |
| VOX | -1.3% | -2.7% | +8.9% | +20.4% | +6.4% | +8.3% | 1.05% |
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 VOX →
Shared Holdings(34)
The top 10 shared positions account for 76% of the overlap, led by LUMN, GSAT and CNK.
 LUMNLumen Technologies Inc COM | 0.39% | 0.64% | 0.39% |
|---|---|---|---|
 GSATGlobalstar Inc COM NEW | 0.22% | 0.26% | 0.22% |
 CNKCinemark Holdings Inc. COM | 0.20% | 0.18% | 0.18% |
 MSGEMadison Square Garden Entertainment Corp New COM CL A | 0.16% | 0.16% | 0.16% |
 CARGCargurus, Inc., Class A | 0.18% | 0.15% | 0.15% |
 BATRKAtlanta Braves Holdings, Inc., Class C | 0.13% | 0.14% | 0.13% |
 MGNIMagnite Inc COM | 0.11% | 0.12% | 0.11% |
 IMAXIMAX Corporation COM | 0.11% | 0.11% | 0.11% |
 WLYJohn Wiley & Sons, Inc., Class A | 0.10% | 0.10% | 0.10% |
 YELPYelp Inc CL A | 0.10% | 0.08% | 0.08% |
 TDAYUSA Today Co. Inc. COM | 0.06% | 0.07% | 0.06% |
 CCOICogent Communications Holdings, Inc. COM NEW | 0.06% | 0.05% | 0.05% |
| Stagwell, Inc., Class A | 0.05% | 0.05% | 0.05% |
 IDTIDT Corp., Class B | 0.04% | 0.07% | 0.04% |
 QNSTQuinStreet Inc. COM | 0.04% | 0.04% | 0.04% |
 TRIPTripadvisor Inc COM | 0.04% | 0.07% | 0.04% |
 EVEREverQuote, Inc., Class A | 0.03% | 0.03% | 0.03% |
| Anterix Inc. COM | 0.03% | 0.04% | 0.03% |
 GRNDGrindr Inc COM | 0.03% | 0.03% | 0.03% |
| Ibotta Inc. CLASS A COM SHS | 0.02% | 0.03% | 0.02% |
| Atlanta Braves Holdings, Inc., Class A | 0.02% | 0.02% | 0.02% |
| Gogo Inc COM | 0.02% | 0.02% | 0.02% |
| Fubotv Inc. COM NEW CL A | 0.02% | 0.02% | 0.02% |
 MAXMediaAlpha, Inc., Class A | 0.02% | 0.02% | 0.02% |
 RUMRumble, Inc., Class A | 0.01% | 0.04% | 0.01% |
Frequently Asked Questions
How much do IWO and VOX overlap?
IWO and VOX overlap by 2.1% of portfolio weight. They share 34 holdings (IWO holds 1101 positions and VOX holds 114), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWO and VOX?
The two portfolios are 2.1% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IWO and VOX?
The largest positions held by both funds are LUMN, GSAT, CNK, MSGE and CARG. Together the top 10 shared positions account for 76% of the total overlap.
What does IWO own that VOX doesn't?
1067 positions (97.6% of IWO) are unique to IWO, led by BE, FN and CRDO. In the other direction, 80 positions (96.9% of VOX) are unique to VOX.