IYZ vs VOO: Holdings Overlap
IYZiShares U.S. Telecommunications ETF
iShares · 21 holdings · $1.3B · as of 2026-03-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
How similar are IYZ and VOO?
iShares U.S. Telecommunications ETF (IYZ, by iShares) holds 21 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 10 holdings in common, and by portfolio weight the two funds are 2.2% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 2.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 10IYZ holds 21 · VOO holds 504
- Weight in Shared Holdings
- IYZ 73%·VOO 2%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
11 of 21 positions (27.2% of the fund) are not held by VOO.
Sector Breakdown
| Sector | IYZ | VOO |
|---|---|---|
| Communication Services | 61.4% | 10.5% |
| Information Technology | 38.4% | 32.7% |
| Financials | 0.0% | 12.4% |
| Consumer Discretionary | 0.0% | 9.9% |
| Health Care | 0.0% | 9.5% |
| Other Sectors | 0.0% | 24.9% |
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.
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% |
| VOO | +3.4% | +14.0% | +23.7% | +21.3% | +13.4% | +15.4% | 1.03% |
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 VOO →
Shared Holdings(10)
The top 10 shared positions account for 100% of the overlap, led by CSCO, VZ and T.
 CSCOCisco Systems, Inc. COM | 19.13% | 0.55% | 0.55% |
|---|---|---|---|
 VZVerizon Communications Inc. COM | 13.44% | 0.38% | 0.38% |
 TAT&T Inc COM | 12.84% | 0.36% | 0.36% |
 ANETArista Networks Inc COM SHS | 3.98% | 0.23% | 0.23% |
 CMCSAComcast Corporation CL A | 3.97% | 0.18% | 0.18% |
 TMUST-Mobile US Inc COM | 4.10% | 0.18% | 0.18% |
 MSIMotorola Solutions Inc COM NEW | 3.71% | 0.13% | 0.13% |
 CIENCiena Corporation COM NEW | 4.25% | 0.10% | 0.10% |
 LITELumentum Holdings Inc. COM | 3.88% | 0.09% | 0.09% |
 CHTRCharter Communications, Inc., Class A | 3.35% | 0.03% | 0.03% |
Frequently Asked Questions
How much do IYZ and VOO overlap?
IYZ and VOO overlap by 2.2% of portfolio weight. They share 10 holdings (IYZ holds 21 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IYZ and VOO?
The two portfolios are 2.2% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IYZ and VOO?
The largest positions held by both funds are CSCO, VZ, T, ANET and CMCSA. Together the top 10 shared positions account for 100% of the total overlap.
What does IYZ own that VOO doesn't?
11 positions (27.2% of IYZ) are unique to IYZ, led by IRDM, TIGO and UI. In the other direction, 494 positions (97.5% of VOO) are unique to VOO.