IWM vs VOO: Holdings Overlap
iShares · 1941 holdings · $82.2B · as of 2026-03-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
How similar are IWM and VOO?
iShares Russell 2000 ETF (IWM, by iShares) holds 1941 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 1 holdings in common, and by portfolio weight the two funds are 0.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 1IWM holds 1941 · VOO holds 504
- Weight in Shared Holdings
- IWM 1%·VOO 0%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 IWM
1940 of 1941 positions (99.1% of the fund) are not held by VOO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWM | VOO |
|---|---|---|
| Information Technology | 13.6% | 32.7% |
| Industrials | 17.9% | 9.0% |
| Health Care | 16.6% | 9.5% |
| Financials | 15.3% | 12.4% |
| Communication Services | 2.5% | 10.5% |
| Other Sectors | 28.2% | 25.7% |
| Unclassified | 5.5% | 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 (5% of IWM, 0% of VOO).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWM | +1.8% | +23.0% | +38.6% | +17.1% | +7.5% | +10.8% | 0.88% |
| 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 IWM vs VOO →
Shared Holdings(1)
 ECHOEchoStar Corp., Class A | 0.54% | 0.03% | 0.03% |
|---|
Frequently Asked Questions
How much do IWM and VOO overlap?
IWM and VOO overlap by 0.0% of portfolio weight. They share 1 holdings (IWM holds 1941 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWM and VOO?
The two portfolios are 0.0% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IWM and VOO?
The largest positions held by both funds are ECHO. Together the top 1 shared positions account for 94% of the total overlap.
What does IWM own that VOO doesn't?
1940 positions (99.1% of IWM) are unique to IWM, led by BE, CDE and FN. In the other direction, 503 positions (99.7% of VOO) are unique to VOO.