IWR vs MDYG: Holdings Overlap
IWRiShares Russell Mid-Cap ETF
iShares · 806 holdings · $57.6B · as of 2026-03-31
MDYGState Street® SPDR® S&P 400™ Mid Cap Growth ETF
State Street (SPDR) · 245 holdings · $2.9B · as of 2026-08-06
Holdings snapshots are 128 days apart (IWR: 2026-03-31, MDYG: 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 MDYG?
iShares Russell Mid-Cap ETF (IWR, by iShares) holds 806 positions; State Street® SPDR® S&P 400™ Mid Cap Growth ETF (MDYG, by State Street (SPDR)) holds 245. They have 177 holdings in common, and by portfolio weight the two funds are 13.2% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 13.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 177IWR holds 806 · MDYG holds 245
- Weight in Shared Holdings
- IWR 13%·MDYG 76%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
629 of 806 positions (86.5% of the fund) are not held by MDYG. Showing the top 30 by weight.
Only in MDYG
68 of 245 positions (23.9% of the fund) are not held by IWR. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWR | MDYG |
|---|---|---|
| Industrials | 18.7% | 29.8% |
| Information Technology | 13.0% | 20.2% |
| Health Care | 9.2% | 15.5% |
| Financials | 13.6% | 8.0% |
| Consumer Discretionary | 10.8% | 9.0% |
| Other Sectors | 34.3% | 17.3% |
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 |
|---|---|---|---|---|---|---|---|
| IWR | +2.9% | +18.1% | +23.0% | +16.4% | +8.5% | +11.6% | 1.12% |
| MDYG | +3.3% | +21.6% | +28.0% | +16.0% | +8.5% | +11.3% | 0.56% |
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 MDYG →
Shared Holdings(177)
The top 10 shared positions account for 13% of the overlap, led by FTI, UTHR and CW.
 FTITechnipFMC PLC USD1 | 0.22% | 1.48% | 0.22% |
|---|---|---|---|
 UTHRUnited Therapeutics Corporation COM | 0.20% | 1.21% | 0.20% |
 CWCurtiss-Wright Corporation | 0.20% | 1.41% | 0.20% |
 XPOXPO Inc COM | 0.18% | 1.23% | 0.18% |
 RGLDRoyal Gold, Inc. COM | 0.17% | 0.95% | 0.17% |
 WWDWoodward Inc. COM | 0.17% | 1.16% | 0.17% |
 BURLBurlington Stores Inc. COM | 0.16% | 0.76% | 0.16% |
 MTZMastec, Inc. COM | 0.16% | 0.85% | 0.16% |
 ATIATI Inc COM | 0.16% | 1.63% | 0.16% |
 CRSCarpenter Technology Corporation COM | 0.15% | 1.48% | 0.15% |
 ILMNIllumina Inc COM | 0.15% | 0.84% | 0.15% |
 NVTNVent Electric PLC COM USD0.01 | 0.15% | 1.41% | 0.15% |
 BWXTBWX Technologies Inc. COM | 0.15% | 0.81% | 0.15% |
 PEverpure, Inc., Class A | 0.15% | 1.47% | 0.15% |
 TWLOTwilio, Inc., Class A | 0.14% | 1.56% | 0.14% |
 RBARB Global Inc COM | 0.14% | 0.92% | 0.14% |
 ENTGEntegris Inc COM | 0.14% | 0.46% | 0.14% |
 RBCRBC Bearings Incorporated | 0.13% | 0.95% | 0.13% |
 THCTenet Healthcare Corporation COM NEW | 0.13% | 1.18% | 0.13% |
 ITTITT Inc COM | 0.13% | 1.02% | 0.13% |
 MKSIMKS Inc. COM | 0.12% | 0.74% | 0.12% |
 SGISomnigroup International Inc. COM | 0.12% | 0.73% | 0.12% |
 MTSIMACOM Technology Solutions Holdings Inc. COM | 0.12% | 1.06% | 0.12% |
 WPCW. P. Carey Inc COM | 0.12% | 0.45% | 0.12% |
 EWBCEast West Bancorp Inc COM | 0.12% | 0.49% | 0.12% |
Frequently Asked Questions
How much do IWR and MDYG overlap?
IWR and MDYG overlap by 13.2% of portfolio weight. They share 177 holdings (IWR holds 806 positions and MDYG holds 245), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWR and MDYG?
The two portfolios are 13.2% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of IWR and MDYG?
The largest positions held by both funds are FTI, UTHR, CW, XPO and RGLD. Together the top 10 shared positions account for 13% of the total overlap.
What does IWR own that MDYG doesn't?
629 positions (86.5% of IWR) are unique to IWR, led by GLW, VRT and HWM. In the other direction, 68 positions (23.9% of MDYG) are unique to MDYG.