MDY vs MDYG: Holdings Overlap
MDYState Street® SPDR® S&P MIDCAP 400® ETF Trust
State Street (SPDR) · 399 holdings · $27.1B · as of 2026-08-06
MDYGState Street® SPDR® S&P 400™ Mid Cap Growth ETF
State Street (SPDR) · 245 holdings · $2.9B · as of 2026-08-06
How similar are MDY and MDYG?
State Street® SPDR® S&P MIDCAP 400® ETF Trust (MDY, by State Street (SPDR)) holds 399 positions; State Street® SPDR® S&P 400™ Mid Cap Growth ETF (MDYG, by State Street (SPDR)) holds 245. They have 244 holdings in common, and by portfolio weight the two funds are 66.2% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 66.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 244MDY holds 399 · MDYG holds 245
- Weight in Shared Holdings
- MDY 70%·MDYG 99%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 MDY
155 of 399 positions (35.3% of the fund) are not held by MDYG. Showing the top 30 by weight.
Only in MDYG
1 of 245 positions (0.5% of the fund) are not held by MDY.
LAMRLamar Advertising Company Class A0.45%
Sector Breakdown
| Sector | MDY | MDYG |
|---|---|---|
| Industrials | 25.9% | 29.8% |
| Information Technology | 15.6% | 20.2% |
| Financials | 16.0% | 8.0% |
| Health Care | 10.3% | 15.5% |
| Consumer Discretionary | 11.6% | 9.0% |
| Other Sectors | 25.7% | 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 |
|---|---|---|---|---|---|---|---|
| MDY | +3.1% | +18.1% | +25.6% | +14.2% | +8.8% | +10.9% | 0.99% |
| 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 MDY vs MDYG →
Shared Holdings(244)
The top 10 shared positions account for 11% of the overlap, led by ATI, TWLO and ILMN.
 ATIATI Inc COM | 0.83% | 1.63% | 0.83% |
|---|---|---|---|
 TWLOTwilio, Inc., Class A | 0.80% | 1.56% | 0.80% |
 ILMNIllumina Inc COM | 0.80% | 0.84% | 0.80% |
 FTITechnipFMC PLC USD1 | 0.76% | 1.48% | 0.76% |
 CRSCarpenter Technology Corporation COM | 0.76% | 1.48% | 0.76% |
 PEverpure, Inc., Class A | 0.75% | 1.47% | 0.75% |
 NVTNVent Electric PLC COM USD0.01 | 0.72% | 1.41% | 0.72% |
 CWCurtiss-Wright Corporation | 0.72% | 1.41% | 0.72% |
 FIVEFive Below Inc COM | 0.68% | 0.68% | 0.68% |
 OKTAOkta Inc. Class A | 0.66% | 1.28% | 0.66% |
 DYDycom Industries, Inc. COM | 0.67% | 0.64% | 0.64% |
 BURLBurlington Stores Inc. COM | 0.64% | 0.76% | 0.64% |
 XPOXPO Inc COM | 0.63% | 1.23% | 0.63% |
 MOG-AMoog, Inc., Class A | 0.64% | 0.62% | 0.62% |
 UTHRUnited Therapeutics Corporation COM | 0.62% | 1.21% | 0.62% |
 THCTenet Healthcare Corporation COM NEW | 0.60% | 1.18% | 0.60% |
 WWDWoodward Inc. COM | 0.60% | 1.16% | 0.60% |
 NYTNew York Times Co. (The), Class A | 0.62% | 0.56% | 0.56% |
 MTSIMACOM Technology Solutions Holdings Inc. COM | 0.54% | 1.06% | 0.54% |
 ROKURoku, Inc., Class A | 0.54% | 1.05% | 0.54% |
 MKSIMKS Inc. COM | 0.54% | 0.74% | 0.54% |
 FNFabrinet COM USD0.01 | 0.53% | 1.04% | 0.53% |
 ITTITT Inc COM | 0.52% | 1.02% | 0.52% |
 EWBCEast West Bancorp Inc COM | 0.49% | 0.49% | 0.49% |
 RBCRBC Bearings Incorporated | 0.49% | 0.95% | 0.49% |
Frequently Asked Questions
How much do MDY and MDYG overlap?
MDY and MDYG overlap by 66.2% of portfolio weight. They share 244 holdings (MDY holds 399 positions and MDYG holds 245), based on each fund's latest SEC-reported holdings.
Is it redundant to own both MDY and MDYG?
The two portfolios are 66.2% identical by weight. Owning both mostly doubles down on the shared core rather than diversifying: the same large positions drive both funds.
What are the biggest shared holdings of MDY and MDYG?
The largest positions held by both funds are ATI, TWLO, ILMN, FTI and CRS. Together the top 10 shared positions account for 11% of the total overlap.
What does MDY own that MDYG doesn't?
155 positions (35.3% of MDY) are unique to MDY, led by AA, BJ and SN. In the other direction, 1 positions (0.5% of MDYG) are unique to MDYG.