MDPIX vs. SPY

Last updated Aug 1, 2026

MDPIX (ProFunds Mid Cap Fund) and SPY (State Street SPDR S&P 500 ETF) are both funds - MDPIX is a Mid Cap Blend Equities fund managed by ProFunds, while SPY is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, MDPIX returned 8.73%/yr vs 15.07%/yr for SPY. Their correlation of 0.88 means they have usually moved in the same direction. MDPIX charges 1.82%/yr vs 0.09%/yr for SPY.

Performance

MDPIX vs. SPY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in ProFunds Mid Cap Fund (MDPIX) and State Street SPDR S&P 500 ETF (SPY). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MDPIX achieves a 13.30% return, which is significantly higher than SPY's 10.13% return. Over the past 10 years, MDPIX has underperformed SPY with an annualized return of 8.73%, while SPY has yielded a comparatively higher 15.07% annualized return.

MDPIX

• 1D: 0.81%
• 1M: -1.12%
• 6M: 9.08%
• YTD: 13.30%
• 1Y: 20.80%
• 3Y*: 10.81%
• 5Y*: 6.28%
• 10Y*: 8.73%
• ALL TIME*: 7.69%

SPY

• 1D: 0.72%
• 1M: 0.30%
• 6M: 8.53%
• YTD: 10.13%
• 1Y: 21.49%
• 3Y*: 19.32%
• 5Y*: 12.76%
• 10Y*: 15.07%
• ALL TIME*: 10.79%

*Multi-year figures are annualized to reflect compound growth (CAGR)

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
MDPIX ProFunds Mid Cap Fund	$0.00	$0.00	$0.00
SPY State Street SPDR S&P 500 ETF	$37.27B	$35.99B	$39.23B

MDPIX vs. SPY - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MDPIX ProFunds Mid Cap Fund	13.30%	5.68%	11.55%	14.16%	-14.81%	21.89%	11.24%	23.46%	-12.78%	14.18%
SPY State Street SPDR S&P 500 ETF	10.13%	17.72%	24.89%	26.18%	-18.18%	28.73%	18.33%	31.22%	-4.57%	21.71%

Correlation

The correlation between MDPIX and SPY is 0.76, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.76
Correlation (3Y) Balances recent behavior with more history.	0.78
Correlation (5Y) Shows whether the relationship held over a longer period.	0.83
Correlation (10Y) Provides a long-term view across more market conditions.	0.83
Correlation (All Time) Calculated using the full available price history since Aug 31, 2001	0.88

The correlation between MDPIX and SPY shifts across timeframes, from 0.76 (1 year) to 0.88 (all time), reflecting how their relationship changes across market environments.

Return for Risk

MDPIX vs. SPY — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

MDPIX

MDPIX Risk / Return Rank: 42
MDPIX Sharpe Ratio Rank: 35
MDPIX Sortino Ratio Rank: 37
MDPIX Omega Ratio Rank: 34
MDPIX Calmar Ratio Rank: 53
MDPIX Martin Ratio Rank: 50

SPY

SPY Risk / Return Rank: 67
SPY Sharpe Ratio Rank: 67
SPY Sortino Ratio Rank: 64
SPY Omega Ratio Rank: 65
SPY Calmar Ratio Rank: 64
SPY Martin Ratio Rank: 76

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

MDPIX vs. SPY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for ProFunds Mid Cap Fund (MDPIX) and State Street SPDR S&P 500 ETF (SPY). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	MDPIX	SPY	Difference
Sharpe ratio: Return per unit of total volatility	1.14	1.52	-0.38
Sortino ratio: Return per unit of downside risk	1.72	2.11	-0.39
Omega ratio: Gain probability vs. loss probability	1.20	1.27	-0.07
Calmar ratio: Return relative to maximum drawdown	1.97	2.20	-0.23
Martin ratio: Return relative to average drawdown	7.04	9.40	-2.36

MDPIX vs. SPY - Sharpe Ratio Comparison

The current MDPIX Sharpe Ratio is 1.14, which is comparable to the SPY Sharpe Ratio of 1.52. The chart below compares the historical Sharpe Ratios of MDPIX and SPY, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

MDPIX vs. SPY - Drawdown Comparison

The maximum MDPIX drawdown since its inception was -57.32%, roughly equal to the maximum SPY drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for MDPIX and SPY.

Drawdown Indicators

	MDPIX	SPY	Difference
Max Drawdown Largest peak-to-trough decline	-57.32%	-55.19%	-2.13%
Max Drawdown (1Y) Largest decline over 1 year	-9.02%	-8.88%	-0.14%
Max Drawdown (3Y) Largest decline over 3 years	-24.59%	-18.76%	-5.83%
Max Drawdown (5Y) Largest decline over 5 years	-24.86%	-24.50%	-0.36%
Max Drawdown (10Y) Largest decline over 10 years	-42.07%	-33.72%	-8.35%
Current Drawdown Current decline from peak	-2.40%	-1.40%	-1.00%
Average Drawdown Average peak-to-trough decline	-8.64%	-9.01%	+0.37%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.54%	2.08%	+0.46%

Volatility

MDPIX vs. SPY - Volatility Comparison

ProFunds Mid Cap Fund (MDPIX) and State Street SPDR S&P 500 ETF (SPY) have volatilities of 3.48% and 3.58%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MDPIX	SPY	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.48%	3.58%	-0.10%
Volatility (6M) Calculated over the trailing 6-month period	11.55%	10.14%	+1.41%
Volatility (1Y) Calculated over the trailing 1-year period	15.65%	12.89%	+2.76%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.66%	17.18%	+2.48%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.68%	17.95%	+2.73%

MDPIX vs. SPY - Expense Ratio Comparison

MDPIX has a 1.82% expense ratio, which is higher than SPY's 0.09% expense ratio.

Dividends

MDPIX vs. SPY - Dividend Comparison

MDPIX's dividend yield for the trailing twelve months is around 0.36%, less than SPY's 1.01% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MDPIX ProFunds Mid Cap Fund	0.36%	0.41%	1.26%	0.00%	0.00%	1.79%	0.24%	5.00%	3.00%	7.60%	0.00%	0.05%
SPY State Street SPDR S&P 500 ETF	1.01%	1.07%	1.21%	1.40%	1.65%	1.20%	1.52%	1.75%	2.04%	1.80%	2.03%	2.06%

Frequently Asked Questions

Can I hold both MDPIX and SPY in my portfolio?

MDPIX and SPY have a correlation of 0.76, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MDPIX or SPY?

SPY has higher volatility (3.58%) compared to MDPIX (3.48%). In terms of maximum drawdown, MDPIX dropped -57.32% vs SPY's -55.19%.

Which has better risk-adjusted returns?

SPY currently has the higher Sharpe Ratio (1.52 vs 1.14), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.