IWR vs SPSM: Holdings Overlap
IWRiShares Russell Mid-Cap ETF
iShares · 806 holdings · $57.6B · as of 2026-03-31
SPSMState Street® SPDR® Portfolio S&P 600™ Small Cap ETF
State Street (SPDR) · 604 holdings · $17.3B · as of 2026-08-06
Holdings snapshots are 128 days apart (IWR: 2026-03-31, SPSM: 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 IWR and SPSM?
iShares Russell Mid-Cap ETF (IWR, by iShares) holds 806 positions; State Street® SPDR® Portfolio S&P 600™ Small Cap ETF (SPSM, by State Street (SPDR)) holds 604. They have 72 holdings in common, and by portfolio weight the two funds are 2.1% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 2.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 72IWR holds 806 · SPSM holds 604
- Weight in Shared Holdings
- IWR 2%·SPSM 17%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 IWR
734 of 806 positions (97.6% of the fund) are not held by SPSM. Showing the top 30 by weight.
Only in SPSM
532 of 604 positions (82.6% of the fund) are not held by IWR. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWR | SPSM |
|---|---|---|
| Financials | 13.6% | 19.0% |
| Industrials | 18.7% | 17.4% |
| Consumer Discretionary | 10.8% | 13.9% |
| Information Technology | 13.0% | 12.8% |
| Health Care | 9.2% | 10.6% |
| Other Sectors | 34.3% | 25.1% |
| Unclassified | 0.1% | 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 IWR, 1% of SPSM).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWR | +2.9% | +18.1% | +23.0% | +16.4% | +8.5% | +11.6% | 1.12% |
| SPSM | +2.4% | +24.5% | +36.5% | +14.6% | +7.7% | +10.9% | 1.36% |
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 IWR vs SPSM →
Shared Holdings(72)
The top 10 shared positions account for 28% of the overlap, led by EMN, ESI and LKQ.
 EMNEastman Chemical Company COM | 0.07% | 0.46% | 0.07% |
|---|---|---|---|
 ESIElement Solutions Inc COM | 0.06% | 0.48% | 0.06% |
 LKQLKQ Corporation COM | 0.06% | 0.34% | 0.06% |
 CAGConagra Brands Inc COM | 0.06% | 0.39% | 0.06% |
 EPAMEPAM Systems Inc. COM | 0.06% | 0.27% | 0.06% |
 MTCHMatch Group Inc COM | 0.06% | 0.47% | 0.06% |
 CECelanese Corporation COM | 0.06% | 0.26% | 0.06% |
 AWIArmstrong World Industries, Inc. COM | 0.06% | 0.43% | 0.06% |
 POOLPool Corporation COM | 0.05% | 0.35% | 0.05% |
 QRVOQorvo Inc COM | 0.05% | 0.42% | 0.05% |
 PAYCPaycom Software Inc COM | 0.05% | 0.49% | 0.05% |
 ECGEverus Construction Group Inc. COM | 0.05% | 0.39% | 0.05% |
 KMXCarmax Inc COM | 0.05% | 0.45% | 0.05% |
 LWLamb Weston Holdings Inc COM | 0.05% | 0.39% | 0.05% |
 MKTXMarketAxess Holdings Inc. COM | 0.04% | 0.32% | 0.04% |
 CZRCaesars Entertainment Inc. COM | 0.04% | 0.34% | 0.04% |
 TFXTeleflex Incorporated COM | 0.04% | 0.34% | 0.04% |
 RITMRithm Capital Corp. COM NEW | 0.04% | 0.30% | 0.04% |
 MSGSMadison Square Garden Sports Corp. CL A | 0.04% | 0.39% | 0.04% |
 LYFTLyft, Inc., Class A | 0.04% | 0.34% | 0.04% |
 MHKMohawk Industries, Inc. COM | 0.04% | 0.37% | 0.04% |
 ENPHEnphase Energy Inc COM | 0.04% | 0.29% | 0.04% |
 RALRalliant Corp. COM | 0.04% | 0.40% | 0.04% |
 BFAMBright Horizons Family Solutions Inc Del COM | 0.04% | 0.21% | 0.04% |
 ETSYEtsy Inc COM | 0.04% | 0.43% | 0.04% |
Frequently Asked Questions
How much do IWR and SPSM overlap?
IWR and SPSM overlap by 2.1% of portfolio weight. They share 72 holdings (IWR holds 806 positions and SPSM holds 604), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWR and SPSM?
The two portfolios are 2.1% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IWR and SPSM?
The largest positions held by both funds are EMN, ESI, LKQ, CAG and EPAM. Together the top 10 shared positions account for 28% of the total overlap.
What does IWR own that SPSM doesn't?
734 positions (97.6% of IWR) are unique to IWR, led by GLW, VRT and HWM. In the other direction, 532 positions (82.6% of SPSM) are unique to SPSM.