IYZ vs VBK: Holdings Overlap
IYZiShares U.S. Telecommunications ETF
iShares · 21 holdings · $1.3B · as of 2026-03-31
VBKVanguard Small-cap Growth Index Fund
Vanguard · 551 holdings · $24.3B · as of 2026-03-31
How similar are IYZ and VBK?
iShares U.S. Telecommunications ETF (IYZ, by iShares) holds 21 positions; Vanguard Small-cap Growth Index Fund (VBK, by Vanguard) holds 551. They have 7 holdings in common, and by portfolio weight the two funds are 3.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 3.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 7IYZ holds 21 · VBK holds 551
- Weight in Shared Holdings
- IYZ 22%·VBK 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 IYZ
14 of 21 positions (78.1% of the fund) are not held by VBK.
Only in VBK
544 of 551 positions (96.7% of the fund) are not held by IYZ. Showing the top 30 by weight.
Sector Breakdown
| Sector | IYZ | VBK |
|---|---|---|
| Communication Services | 61.4% | 4.2% |
| Information Technology | 38.4% | 21.6% |
| Industrials | 0.0% | 24.6% |
| Health Care | 0.0% | 16.1% |
| Consumer Discretionary | 0.0% | 9.9% |
| Other Sectors | 0.0% | 22.4% |
| Unclassified | 0.0% | 0.9% |
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. “Unclassified” is weight we could not classify (0% of IYZ, 1% of VBK).
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% |
| VBK | +1.8% | +19.6% | +29.4% | +16.6% | +5.3% | +11.4% | 0.42% |
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 VBK →
Shared Holdings(7)
The top 7 shared positions account for 100% of the overlap, led by CIEN, LITE and ASTS.
 CIENCiena Corporation COM NEW | 4.25% | 0.92% | 0.92% |
|---|---|---|---|
 LITELumentum Holdings Inc. COM | 3.88% | 0.84% | 0.84% |
 ASTSAST SpaceMobile, Inc., Class A | 3.27% | 0.72% | 0.72% |
 ROKURoku, Inc., Class A | 3.23% | 0.41% | 0.41% |
 IRDMIridium Communications, Inc. COM | 3.74% | 0.08% | 0.08% |
 GLIBKGCI Liberty, Inc., Class C | 3.03% | 0.02% | 0.02% |
 GLIBAGCI Liberty, Inc., Class A | 0.31% | 0.00% | 0.00% |
Frequently Asked Questions
How much do IYZ and VBK overlap?
IYZ and VBK overlap by 3.0% of portfolio weight. They share 7 holdings (IYZ holds 21 positions and VBK holds 551), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IYZ and VBK?
The two portfolios are 3.0% 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 VBK?
The largest positions held by both funds are CIEN, LITE, ASTS, ROKU and IRDM. Together the top 7 shared positions account for 100% of the total overlap.
What does IYZ own that VBK doesn't?
14 positions (78.1% of IYZ) are unique to IYZ, led by CSCO, VZ and T. In the other direction, 544 positions (96.7% of VBK) are unique to VBK.