MDYG vs SPY: Holdings Overlap
MDYGState Street® SPDR® S&P 400™ Mid Cap Growth ETF
State Street (SPDR) · 245 holdings · $2.9B · as of 2026-08-06
SPYState Street® SPDR® S&P 500® ETF Trust
State Street (SPDR) · 504 holdings · $812.0B · as of 2026-08-06
How similar are MDYG and SPY?
State Street® SPDR® S&P 400™ Mid Cap Growth ETF (MDYG, by State Street (SPDR)) holds 245 positions; State Street® SPDR® S&P 500® ETF Trust (SPY, by State Street (SPDR)) holds 504. They have 0 holdings in common, and by portfolio weight the two funds are 0.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 0MDYG holds 245 · SPY holds 504
- Weight in Shared Holdings
- MDYG 0%·SPY 0%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 MDYG
245 of 245 positions (99.8% of the fund) are not held by SPY. Showing the top 30 by weight.
Sector Breakdown
| Sector | MDYG | SPY |
|---|---|---|
| Information Technology | 20.2% | 37.6% |
| Industrials | 29.8% | 8.8% |
| Health Care | 15.5% | 8.9% |
| Financials | 8.0% | 12.3% |
| Communication Services | 2.3% | 9.7% |
| Other Sectors | 24.0% | 22.6% |
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 |
|---|---|---|---|---|---|---|---|
| MDYG | +3.3% | +21.6% | +28.0% | +16.0% | +8.5% | +11.3% | 0.56% |
| 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 MDYG vs SPY →
Shared Holdings(0)
These two funds have no holdings in common.
Frequently Asked Questions
How much do MDYG and SPY overlap?
MDYG and SPY overlap by 0.0% of portfolio weight. They share 0 holdings (MDYG holds 245 positions and SPY holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both MDYG and SPY?
The two portfolios are 0.0% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What does MDYG own that SPY doesn't?
245 positions (99.8% of MDYG) are unique to MDYG, led by ATI, TWLO and FTI. In the other direction, 504 positions (99.9% of SPY) are unique to SPY.