IWO vs SLYG: Holdings Overlap
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
SLYGState Street® SPDR® S&P 600™ Small Cap Growth ETF
State Street (SPDR) · 349 holdings · $5.3B · as of 2026-08-06
Holdings snapshots are 128 days apart (IWO: 2026-03-31, SLYG: 2026-08-06). 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 SLYG?
iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101 positions; State Street® SPDR® S&P 600™ Small Cap Growth ETF (SLYG, by State Street (SPDR)) holds 349. They have 232 holdings in common, and by portfolio weight the two funds are 34.8% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 34.8%Sum of the smaller weight of each shared holding
- Shared Holdings
- 232IWO holds 1101 · SLYG holds 349
- Weight in Shared Holdings
- IWO 36%·SLYG 70%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
869 of 1101 positions (64.3% of the fund) are not held by SLYG. Showing the top 30 by weight.
Only in SLYG
117 of 349 positions (29.9% of the fund) are not held by IWO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWO | SLYG |
|---|---|---|
| Industrials | 23.7% | 21.9% |
| Health Care | 23.1% | 15.0% |
| Information Technology | 19.0% | 13.8% |
| Financials | 8.6% | 15.7% |
| Consumer Discretionary | 7.3% | 12.0% |
| Other Sectors | 14.1% | 20.6% |
| Unclassified | 4.0% | 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 (4% of IWO, 1% of SLYG).
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% |
| SLYG | +1.2% | +25.9% | +33.5% | +15.2% | +6.7% | +11.2% | 0.64% |
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 SLYG →
Shared Holdings(232)
The top 10 shared positions account for 13% of the overlap, led by ESE, AGX and PRIM.
 ESEESCO Technologies Inc. COM | 0.49% | 0.95% | 0.49% |
|---|---|---|---|
 AGXArgan Inc COM | 0.49% | 0.92% | 0.49% |
 PRIMPrimoris Services Corp. COM | 0.49% | 0.49% | 0.49% |
 ZWSZurn Elkay Water Solutions Corporation COM | 0.45% | 0.86% | 0.45% |
 FSSFederal Signal Corp. COM | 0.44% | 0.87% | 0.44% |
 EATBrinker International, Inc. COM | 0.42% | 1.09% | 0.42% |
 IBPInstalled Building Products Inc COM | 0.41% | 0.60% | 0.41% |
 PTGXProtagonist Therapeutics Inc COM | 0.41% | 0.99% | 0.41% |
 GKOSGlaukos Corp. COM | 0.40% | 0.77% | 0.40% |
 AROCArchrock Inc COM | 0.40% | 0.65% | 0.40% |
 SNEXStoneX Group Inc COM | 0.40% | 0.79% | 0.40% |
 RHPRyman Hospitality Properties Inc COM | 0.38% | 0.88% | 0.38% |
 FORMFormfactor Inc COM | 0.38% | 1.00% | 0.38% |
 BCPCBalchem Corp COM | 0.37% | 0.38% | 0.37% |
 ROADConstruction Partners, Inc., Class A | 0.36% | 0.54% | 0.36% |
 POWLPowell Industries Inc. COM | 0.35% | 0.66% | 0.35% |
 PLXSPlexus Corp COM | 0.34% | 0.35% | 0.34% |
 CWSTCasella Waste Systems, Inc., Class A | 0.34% | 0.63% | 0.34% |
 KGSKodiak Gas Services Inc. COM | 0.33% | 0.62% | 0.33% |
 TGTXTG Therapeutics Inc COM | 0.32% | 0.73% | 0.32% |
 PIPRPiper Sandler Companies COM NEW | 0.36% | 0.30% | 0.30% |
 GVAGranite Construction Inc COM | 0.30% | 0.59% | 0.30% |
 BMIBadger Meter Inc COM | 0.30% | 0.44% | 0.30% |
 BOOTBoot Barn Holdings Inc COM | 0.30% | 0.55% | 0.30% |
 MIRMirion Technologies, Inc., Class A | 0.30% | 0.41% | 0.30% |
Frequently Asked Questions
How much do IWO and SLYG overlap?
IWO and SLYG overlap by 34.8% of portfolio weight. They share 232 holdings (IWO holds 1101 positions and SLYG holds 349), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWO and SLYG?
The two portfolios are 34.8% 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 SLYG?
The largest positions held by both funds are ESE, AGX, PRIM, ZWS and FSS. Together the top 10 shared positions account for 13% of the total overlap.
What does IWO own that SLYG doesn't?
869 positions (64.3% of IWO) are unique to IWO, led by BE, FN and CRDO. In the other direction, 117 positions (29.9% of SLYG) are unique to SLYG.