IWO vs VIOG: Holdings Overlap
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
VIOGVanguard S&P Small-cap 600 Growth Index Fund
Vanguard · 342 holdings · $1.1B · as of 2026-05-31
Holdings snapshots are 61 days apart (IWO: 2026-03-31, VIOG: 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 VIOG?
iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101 positions; Vanguard S&P Small-cap 600 Growth Index Fund (VIOG, by Vanguard) holds 342. They have 228 holdings in common, and by portfolio weight the two funds are 35.7% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 35.7%Sum of the smaller weight of each shared holding
- Shared Holdings
- 228IWO holds 1101 · VIOG holds 342
- Weight in Shared Holdings
- IWO 36%·VIOG 71%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
873 of 1101 positions (63.7% of the fund) are not held by VIOG. Showing the top 30 by weight.
Only in VIOG
114 of 342 positions (28.8% of the fund) are not held by IWO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWO | VIOG |
|---|---|---|
| Industrials | 23.7% | 21.8% |
| Health Care | 23.1% | 14.7% |
| Information Technology | 19.0% | 18.4% |
| Financials | 8.6% | 14.2% |
| Consumer Discretionary | 7.3% | 10.8% |
| Other Sectors | 14.1% | 19.9% |
| 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 VIOG).
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% |
| VIOG | +1.1% | +25.9% | +33.8% | +15.2% | +6.8% | +11.2% | 0.75% |
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 VIOG →
Shared Holdings(228)
The top 10 shared positions account for 13% of the overlap, led by VIAV, ESE and AGX.
 VIAVViavi Solutions Inc COM | 0.51% | 1.33% | 0.51% |
|---|---|---|---|
 ESEESCO Technologies Inc. COM | 0.49% | 0.89% | 0.49% |
 AGXArgan Inc COM | 0.49% | 1.10% | 0.49% |
 PRIMPrimoris Services Corp. COM | 0.49% | 0.80% | 0.49% |
 SMTCSemtech Corporation COM | 0.48% | 1.17% | 0.48% |
 ZWSZurn Elkay Water Solutions Corporation COM | 0.45% | 0.83% | 0.45% |
 FSSFederal Signal Corp. COM | 0.44% | 0.77% | 0.44% |
 KRYSKrystal Biotech Inc COM | 0.43% | 0.94% | 0.43% |
 EATBrinker International, Inc. COM | 0.42% | 0.73% | 0.42% |
 IBPInstalled Building Products Inc COM | 0.41% | 0.56% | 0.41% |
 PTGXProtagonist Therapeutics Inc COM | 0.41% | 0.69% | 0.41% |
 GKOSGlaukos Corp. COM | 0.40% | 0.48% | 0.40% |
 AROCArchrock Inc COM | 0.40% | 0.70% | 0.40% |
 SNEXStoneX Group Inc COM | 0.40% | 0.94% | 0.40% |
 LUMNLumen Technologies Inc COM | 0.39% | 0.55% | 0.39% |
 RHPRyman Hospitality Properties Inc COM | 0.38% | 0.86% | 0.38% |
 FORMFormfactor Inc COM | 0.38% | 1.14% | 0.38% |
 BTSGBrightSpring Health Services Inc. COM | 0.37% | 0.97% | 0.37% |
 BCPCBalchem Corp COM | 0.37% | 0.35% | 0.35% |
 POWLPowell Industries Inc. COM | 0.35% | 0.96% | 0.35% |
 PIPRPiper Sandler Companies COM NEW | 0.36% | 0.34% | 0.34% |
 PLXSPlexus Corp COM | 0.34% | 0.37% | 0.34% |
 CWSTCasella Waste Systems, Inc., Class A | 0.34% | 0.61% | 0.34% |
 KGSKodiak Gas Services Inc. COM | 0.33% | 0.74% | 0.33% |
 TGTXTG Therapeutics Inc COM | 0.32% | 0.61% | 0.32% |
Frequently Asked Questions
How much do IWO and VIOG overlap?
IWO and VIOG overlap by 35.7% of portfolio weight. They share 228 holdings (IWO holds 1101 positions and VIOG holds 342), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWO and VIOG?
The two portfolios are 35.7% identical by weight. Owning both is defensible: they share a meaningful core, but each fund adds exposure the other lacks.
What are the biggest shared holdings of IWO and VIOG?
The largest positions held by both funds are VIAV, ESE, AGX, PRIM and SMTC. Together the top 10 shared positions account for 13% of the total overlap.
What does IWO own that VIOG doesn't?
873 positions (63.7% of IWO) are unique to IWO, led by BE, FN and CRDO. In the other direction, 114 positions (28.8% of VIOG) are unique to VIOG.