IWM vs MDYG: Holdings Overlap
iShares · 1941 holdings · $82.2B · 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 (IWM: 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 IWM and MDYG?
iShares Russell 2000 ETF (IWM, by iShares) holds 1941 positions; State Street® SPDR® S&P 400™ Mid Cap Growth ETF (MDYG, by State Street (SPDR)) holds 245. They have 63 holdings in common, and by portfolio weight the two funds are 13.8% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 13.8%Sum of the smaller weight of each shared holding
- Shared Holdings
- 63IWM holds 1941 · MDYG holds 245
- Weight in Shared Holdings
- IWM 15%·MDYG 23%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 IWM
1878 of 1941 positions (85.1% of the fund) are not held by MDYG. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWM | MDYG |
|---|---|---|
| Industrials | 17.9% | 29.8% |
| Information Technology | 13.6% | 20.2% |
| Health Care | 16.6% | 15.5% |
| Financials | 15.3% | 8.0% |
| Consumer Discretionary | 8.0% | 9.0% |
| Other Sectors | 22.7% | 17.3% |
| Unclassified | 5.5% | 0.0% |
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 (5% of IWM, 0% of MDYG).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWM | +1.8% | +23.0% | +38.6% | +17.1% | +7.5% | +10.8% | 0.88% |
| 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 IWM vs MDYG →
Shared Holdings(63)
The top 10 shared positions account for 33% of the overlap, led by CDE, FN and NXT.
 CDECoeur Mining Inc COM NEW | 0.65% | 0.86% | 0.65% |
|---|---|---|---|
 FNFabrinet COM USD0.01 | 0.64% | 1.04% | 0.64% |
 NXTNextpower Inc. CLASS A COM | 0.60% | 0.51% | 0.51% |
 KTOSKratos Defense & Security Solutions, Inc. COM NEW | 0.43% | 0.57% | 0.43% |
 AEISAdvanced Energy Industries, Inc. COM | 0.41% | 0.66% | 0.41% |
 STRLSterling Infrastructure Inc COM | 0.41% | 0.88% | 0.41% |
 HLHecla Mining Company COM | 0.40% | 0.57% | 0.40% |
 ENSGEnsign Group, Inc. (The) | 0.38% | 0.56% | 0.38% |
 TTMITTM Technologies Inc COM | 0.34% | 0.76% | 0.34% |
 DYDycom Industries, Inc. COM | 0.34% | 0.64% | 0.34% |
 SPXCSPX Technologies, Inc. COM | 0.33% | 0.57% | 0.33% |
 RMBSRambus Inc. COM | 0.32% | 0.56% | 0.32% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.29% | 0.64% | 0.29% |
 AHRAmerican Healthcare REIT Inc. COM SHS | 0.29% | 0.34% | 0.29% |
 MOG-AMoog, Inc., Class A | 0.28% | 0.62% | 0.28% |
 CTRECaretrust Reit Inc COM | 0.28% | 0.52% | 0.28% |
 WTSWatts Water Technologies, Inc., Class A | 0.27% | 0.55% | 0.27% |
 CYTKCytokinetics Incorporated | 0.27% | 0.32% | 0.27% |
 IDCCInterDigital, Inc. COM | 0.27% | 0.45% | 0.27% |
 SITMSitime Corporation COM | 0.26% | 0.81% | 0.26% |
 VIAVViavi Solutions Inc COM | 0.26% | 0.51% | 0.26% |
 FCFSFirstcash Holdings Inc COM | 0.25% | 0.42% | 0.25% |
 SMTCSemtech Corporation COM | 0.24% | 0.47% | 0.24% |
 HQYHealthequity Inc COM | 0.24% | 0.47% | 0.24% |
 AVAVAeroVironment, Inc. COM | 0.24% | 0.29% | 0.24% |
Frequently Asked Questions
How much do IWM and MDYG overlap?
IWM and MDYG overlap by 13.8% of portfolio weight. They share 63 holdings (IWM holds 1941 positions and MDYG holds 245), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWM and MDYG?
The two portfolios are 13.8% 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 IWM and MDYG?
The largest positions held by both funds are CDE, FN, NXT, KTOS and AEIS. Together the top 10 shared positions account for 33% of the total overlap.
What does IWM own that MDYG doesn't?
1878 positions (85.1% of IWM) are unique to IWM, led by BE, ECHO and CRDO. In the other direction, 182 positions (77.2% of MDYG) are unique to MDYG.