IWD vs MDY: Holdings Overlap
IWDiShares Russell 1000 Value ETF
iShares · 866 holdings · $83.6B · as of 2026-03-31
MDYState Street® SPDR® S&P MIDCAP 400® ETF Trust
State Street (SPDR) · 399 holdings · $27.1B · as of 2026-08-06
Holdings snapshots are 128 days apart (IWD: 2026-03-31, MDY: 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 IWD and MDY?
iShares Russell 1000 Value ETF (IWD, by iShares) holds 866 positions; State Street® SPDR® S&P MIDCAP 400® ETF Trust (MDY, by State Street (SPDR)) holds 399. They have 270 holdings in common, and by portfolio weight the two funds are 7.1% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 7.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 270IWD holds 866 · MDY holds 399
- Weight in Shared Holdings
- IWD 7%·MDY 78%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 IWD
596 of 866 positions (92.7% of the fund) are not held by MDY. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWD | MDY |
|---|---|---|
| Industrials | 13.4% | 25.9% |
| Financials | 20.0% | 16.0% |
| Information Technology | 11.7% | 15.6% |
| Health Care | 11.7% | 10.3% |
| Consumer Discretionary | 7.0% | 11.6% |
| Other Sectors | 36.1% | 25.7% |
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 |
|---|---|---|---|---|---|---|---|
| IWD | +4.0% | +23.3% | +34.5% | +19.0% | +11.9% | +11.7% | 1.36% |
| MDY | +3.1% | +18.1% | +25.6% | +14.2% | +8.8% | +10.9% | 0.99% |
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 IWD vs MDY →
Shared Holdings(270)
The top 10 shared positions account for 10% of the overlap, led by FTI, UTHR and CW.
 FTITechnipFMC PLC USD1 | 0.09% | 0.76% | 0.09% |
|---|---|---|---|
 UTHRUnited Therapeutics Corporation COM | 0.08% | 0.62% | 0.08% |
 CWCurtiss-Wright Corporation | 0.08% | 0.72% | 0.08% |
 WWDWoodward Inc. COM | 0.07% | 0.60% | 0.07% |
 RGLDRoyal Gold, Inc. COM | 0.07% | 0.49% | 0.07% |
 USFDUS Foods Holding Corp COM | 0.07% | 0.64% | 0.07% |
 ATIATI Inc COM | 0.06% | 0.83% | 0.06% |
 ILMNIllumina Inc COM | 0.06% | 0.80% | 0.06% |
 NVTNVent Electric PLC COM USD0.01 | 0.06% | 0.72% | 0.06% |
 XPOXPO Inc COM | 0.06% | 0.63% | 0.06% |
 AAAlcoa Corporation COM | 0.06% | 0.68% | 0.06% |
 OVVOvintiv Inc COM | 0.06% | 0.45% | 0.06% |
 RBARB Global Inc COM | 0.05% | 0.47% | 0.05% |
 THCTenet Healthcare Corporation COM NEW | 0.05% | 0.60% | 0.05% |
 ITTITT Inc COM | 0.05% | 0.52% | 0.05% |
 MTZMastec, Inc. COM | 0.05% | 0.44% | 0.05% |
 RSReliance Inc COM | 0.05% | 0.58% | 0.05% |
 CRSCarpenter Technology Corporation COM | 0.05% | 0.76% | 0.05% |
 MKSIMKS Inc. COM | 0.05% | 0.54% | 0.05% |
 BWXTBWX Technologies Inc. COM | 0.05% | 0.42% | 0.05% |
 NLYAnnaly Capital Management, Inc. COM NEW | 0.05% | 0.45% | 0.05% |
 TWLOTwilio, Inc., Class A | 0.05% | 0.80% | 0.05% |
 ENTGEntegris Inc COM | 0.05% | 0.59% | 0.05% |
 WPCW. P. Carey Inc COM | 0.05% | 0.44% | 0.05% |
 EWBCEast West Bancorp Inc COM | 0.05% | 0.49% | 0.05% |
Showing the top 250 of 270 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWD and MDY overlap?
IWD and MDY overlap by 7.1% of portfolio weight. They share 270 holdings (IWD holds 866 positions and MDY holds 399), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWD and MDY?
The two portfolios are 7.1% 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 IWD and MDY?
The largest positions held by both funds are FTI, UTHR, CW, WWD and RGLD. Together the top 10 shared positions account for 10% of the total overlap.
What does IWD own that MDY doesn't?
596 positions (92.7% of IWD) are unique to IWD, led by BRK-B, JPM and XOM. In the other direction, 129 positions (27.3% of MDY) are unique to MDY.