IYZ vs VOX: Holdings Overlap
IYZiShares U.S. Telecommunications ETF
iShares · 21 holdings · $1.3B · 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 (IYZ: 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 IYZ and VOX?
iShares U.S. Telecommunications ETF (IYZ, by iShares) holds 21 positions; Vanguard Communication Services Index Fund (VOX, by Vanguard) holds 114. They have 14 holdings in common, and by portfolio weight the two funds are 16.7% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 16.7%Sum of the smaller weight of each shared holding
- Shared Holdings
- 14IYZ holds 21 · VOX holds 114
- Weight in Shared Holdings
- IYZ 58%·VOX 17%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 IYZ
7 of 21 positions (42.0% of the fund) are not held by VOX.
Only in VOX
100 of 114 positions (83.0% of the fund) are not held by IYZ. Showing the top 30 by weight.
Sector Breakdown
| Sector | IYZ | VOX |
|---|---|---|
| Communication Services | 61.4% | 99.7% |
| Information Technology | 38.4% | 0.0% |
| Other Sectors | 0.0% | 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.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IYZ | +7.6% | +29.6% | +46.8% | +27.9% | +7.6% | +5.2% | 1.61% |
| 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 IYZ vs VOX →
Shared Holdings(14)
The top 10 shared positions account for 99% of the overlap, led by VZ, T and TMUS.
 VZVerizon Communications Inc. COM | 13.44% | 4.16% | 4.16% |
|---|---|---|---|
 TAT&T Inc COM | 12.84% | 3.68% | 3.68% |
 TMUST-Mobile US Inc COM | 4.10% | 2.49% | 2.49% |
 CMCSAComcast Corporation CL A | 3.97% | 2.35% | 2.35% |
 ASTSAST SpaceMobile, Inc., Class A | 3.27% | 1.42% | 1.42% |
 ROKURoku, Inc., Class A | 3.23% | 1.02% | 1.02% |
 CHTRCharter Communications, Inc., Class A | 3.35% | 0.73% | 0.73% |
 IRDMIridium Communications, Inc. COM | 3.74% | 0.29% | 0.29% |
 LBRDKLiberty Broadband Corporation COM SER C | 2.85% | 0.23% | 0.23% |
 LBTYALiberty Global Ltd., Class A | 1.89% | 0.12% | 0.12% |
 LBTYKLiberty Global Ltd., Class C | 1.43% | 0.10% | 0.10% |
 GLIBKGCI Liberty, Inc., Class C | 3.03% | 0.05% | 0.05% |
 LBRDALiberty Broadband Corporation COM SER A | 0.41% | 0.04% | 0.04% |
 GLIBAGCI Liberty, Inc., Class A | 0.31% | 0.00% | 0.00% |
Frequently Asked Questions
How much do IYZ and VOX overlap?
IYZ and VOX overlap by 16.7% of portfolio weight. They share 14 holdings (IYZ holds 21 positions and VOX holds 114), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IYZ and VOX?
The two portfolios are 16.7% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of IYZ and VOX?
The largest positions held by both funds are VZ, T, TMUS, CMCSA and ASTS. Together the top 10 shared positions account for 99% of the total overlap.
What does IYZ own that VOX doesn't?
7 positions (42.0% of IYZ) are unique to IYZ, led by CSCO, CIEN and ANET. In the other direction, 100 positions (83.0% of VOX) are unique to VOX.