IWP vs SPY: Holdings Overlap
IWPiShares Russell Mid-Cap Growth ETF
iShares · 277 holdings · $20.5B · as of 2026-03-31
SPYState Street® SPDR® S&P 500® ETF Trust
State Street (SPDR) · 504 holdings · $812.0B · as of 2026-08-06
Holdings snapshots are 128 days apart (IWP: 2026-03-31, SPY: 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 IWP and SPY?
iShares Russell Mid-Cap Growth ETF (IWP, by iShares) holds 277 positions; State Street® SPDR® S&P 500® ETF Trust (SPY, by State Street (SPDR)) holds 504. They have 87 holdings in common, and by portfolio weight the two funds are 4.9% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 4.9%Sum of the smaller weight of each shared holding
- Shared Holdings
- 87IWP holds 277 · SPY holds 504
- Weight in Shared Holdings
- IWP 61%·SPY 5%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 IWP
190 of 277 positions (39.3% of the fund) are not held by SPY. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWP | SPY |
|---|---|---|
| Information Technology | 15.6% | 37.6% |
| Industrials | 24.4% | 8.8% |
| Consumer Discretionary | 21.2% | 9.3% |
| Health Care | 14.9% | 8.9% |
| Financials | 8.5% | 12.3% |
| Other Sectors | 15.3% | 23.1% |
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.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWP | +1.5% | +5.4% | +3.1% | +14.6% | +5.1% | +12.1% | 0.34% |
| SPY | +3.4% | +14.0% | +23.7% | +21.2% | +13.3% | +15.3% | 0.97% |
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 IWP vs SPY →
Shared Holdings(87)
The top 10 shared positions account for 28% of the overlap, led by HWM, BNY and VRT.
 HWMHowmet Aerospace Inc COM | 3.32% | 0.17% | 0.17% |
|---|---|---|---|
 BNYThe Bank of New York Mellon Corp. COM | 0.21% | 0.16% | 0.16% |
 VRTVertiv Holdings Co., Class A | 3.43% | 0.16% | 0.16% |
 PWRQuanta Services, Inc. COM | 2.25% | 0.15% | 0.15% |
 PSXPhillips 66 COM | 0.19% | 0.12% | 0.12% |
 ROSTRoss Stores Inc COM | 0.50% | 0.12% | 0.12% |
 RCLRoyal Caribbean Group COM USD0.01 | 2.51% | 0.12% | 0.12% |
 DDOGDatadog, Inc., Class A | 1.33% | 0.11% | 0.11% |
 HLTHilton Worldwide Holdings Inc COM | 2.49% | 0.11% | 0.11% |
 SPGSimon Property Group Inc COM | 0.48% | 0.11% | 0.11% |
 HOODRobinhood Markets, Inc., Class A | 0.25% | 0.11% | 0.11% |
 MPWRMonolithic Power Systems Inc. COM | 1.82% | 0.10% | 0.10% |
 LITELumentum Holdings Inc. COM | 0.13% | 0.10% | 0.10% |
 CORCencora Inc COM | 2.07% | 0.10% | 0.10% |
 FIXComfort Systems USA Inc. COM | 1.73% | 0.09% | 0.09% |
 FASTFastenal Co. COM | 1.57% | 0.09% | 0.09% |
 TRGPTarga Resources Corp. COM | 1.92% | 0.09% | 0.09% |
 GWWW.w. Grainger Inc. COM | 1.46% | 0.08% | 0.08% |
 CAHCardinal Health, Inc. COM | 0.91% | 0.08% | 0.08% |
 AMPAmeriprise Financial, Inc. COM | 1.32% | 0.08% | 0.08% |
 ROKRockwell Automation, Inc. COM | 0.12% | 0.07% | 0.07% |
 CVNACarvana Co., Class A | 1.53% | 0.07% | 0.07% |
 FERGFerguson Enterprises Inc COMMON STOCK NEW | 0.09% | 0.07% | 0.07% |
 IDXXIDEXX Laboratories Inc. COM | 1.61% | 0.07% | 0.07% |
 VSTVistra Corp. COMMON STOCK | 1.83% | 0.07% | 0.07% |
Frequently Asked Questions
How much do IWP and SPY overlap?
IWP and SPY overlap by 4.9% of portfolio weight. They share 87 holdings (IWP holds 277 positions and SPY holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWP and SPY?
The two portfolios are 4.9% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of IWP and SPY?
The largest positions held by both funds are HWM, BNY, VRT, PWR and PSX. Together the top 10 shared positions account for 28% of the total overlap.
What does IWP own that SPY doesn't?
190 positions (39.3% of IWP) are unique to IWP, led by NET, ALNY and RBLX. In the other direction, 417 positions (95.0% of SPY) are unique to SPY.