MLMIX vs. PREIX

Last updated Jun 23, 2026

MLMIX (Morgan Stanley Institutional Fund, Inc. Global Core Portfolio) and PREIX (T. Rowe Price Equity Index 500 Fund) are both mutual funds - MLMIX is a Global Equities fund managed by T. Rowe Price, while PREIX is a Large Cap Blend Equities fund tracking the S&P 500 Index. Over the past 5 years, MLMIX returned 9.24%/yr vs 13.90%/yr for PREIX. Their correlation of 0.92 suggests significant overlap in exposure. MLMIX charges 0.99%/yr vs 0.15%/yr for PREIX.

Performance

MLMIX vs. PREIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Morgan Stanley Institutional Fund, Inc. Global Core Portfolio (MLMIX) and T. Rowe Price Equity Index 500 Fund (PREIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MLMIX achieves a 5.83% return, which is significantly lower than PREIX's 10.08% return.

MLMIX

• 1D: 1.15%
• 1M: 1.27%
• YTD: 5.83%
• 6M: 5.35%
• 1Y: 18.31%
• 3Y*: 16.99%
• 5Y*: 9.24%
• 10Y*: —

PREIX

• 1D: 1.08%
• 1M: 0.45%
• YTD: 10.08%
• 6M: 9.58%
• 1Y: 26.95%
• 3Y*: 20.76%
• 5Y*: 13.90%
• 10Y*: 15.34%

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

MLMIX vs. PREIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MLMIX Morgan Stanley Institutional Fund, Inc. Global Core Portfolio	5.83%	15.25%	23.98%	17.96%	-19.37%	17.56%	21.23%	30.97%	-16.17%	20.83%
PREIX T. Rowe Price Equity Index 500 Fund	10.08%	17.66%	24.78%	26.07%	-18.27%	28.48%	18.17%	31.47%	-4.59%	21.01%

Correlation

The correlation between MLMIX and PREIX is 0.92, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (All Time) Calculated using the full available price history since Jan 3, 2017	0.92

The correlation between MLMIX and PREIX has been stable across timeframes, ranging from 0.91 to 0.92 - a consistent structural relationship.

Return for Risk

MLMIX vs. PREIX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

MLMIX

MLMIX Risk / Return Rank: 20
MLMIX Sharpe Ratio Rank: 19
MLMIX Sortino Ratio Rank: 19
MLMIX Omega Ratio Rank: 20
MLMIX Calmar Ratio Rank: 17
MLMIX Martin Ratio Rank: 23

PREIX

PREIX Risk / Return Rank: 65
PREIX Sharpe Ratio Rank: 63
PREIX Sortino Ratio Rank: 57
PREIX Omega Ratio Rank: 60
PREIX Calmar Ratio Rank: 67
PREIX Martin Ratio Rank: 78

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

MLMIX vs. PREIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Morgan Stanley Institutional Fund, Inc. Global Core Portfolio (MLMIX) and T. Rowe Price Equity Index 500 Fund (PREIX). 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.

	MLMIX	PREIX	Difference
Sharpe ratio: Return per unit of total volatility	1.18	2.15	-0.97
Sortino ratio: Return per unit of downside risk	1.70	2.90	-1.21
Omega ratio: Gain probability vs. loss probability	1.22	1.39	-0.17
Calmar ratio: Return relative to maximum drawdown	1.37	3.00	-1.63
Martin ratio: Return relative to average drawdown	5.27	13.55	-8.28

MLMIX vs. PREIX - Sharpe Ratio Comparison

The current MLMIX Sharpe Ratio is 1.18, which is lower than the PREIX Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of MLMIX and PREIX, 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

MLMIX vs. PREIX - Drawdown Comparison

The maximum MLMIX drawdown since its inception was -35.66%, smaller than the maximum PREIX drawdown of -55.32%. Use the drawdown chart below to compare losses from any high point for MLMIX and PREIX.

Drawdown Indicators

	MLMIX	PREIX	Difference
Max Drawdown Largest peak-to-trough decline	-35.66%	-55.32%	+19.66%
Max Drawdown (1Y) Largest decline over 1 year	-13.31%	-8.93%	-4.38%
Max Drawdown (3Y) Largest decline over 3 years	-19.56%	-18.78%	-0.78%
Max Drawdown (5Y) Largest decline over 5 years	-28.79%	-24.60%	-4.19%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.81%	—
Current Drawdown Current decline from peak	-0.16%	-1.37%	+1.21%
Average Drawdown Average peak-to-trough decline	-7.41%	-8.72%	+1.31%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.44%	1.97%	+1.47%

Volatility

MLMIX vs. PREIX - Volatility Comparison

Morgan Stanley Institutional Fund, Inc. Global Core Portfolio (MLMIX) has a higher volatility of 5.07% compared to T. Rowe Price Equity Index 500 Fund (PREIX) at 4.77%. This indicates that MLMIX's price experiences larger fluctuations and is considered to be riskier than PREIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MLMIX	PREIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.07%	4.77%	+0.30%
Volatility (6M) Calculated over the trailing 6-month period	13.03%	9.91%	+3.12%
Volatility (1Y) Calculated over the trailing 1-year period	15.45%	12.48%	+2.97%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.57%	17.09%	+1.48%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.56%	18.15%	+1.41%

MLMIX vs. PREIX - Expense Ratio Comparison

MLMIX has a 0.99% expense ratio, which is higher than PREIX's 0.15% expense ratio.

Dividends

MLMIX vs. PREIX - Dividend Comparison

MLMIX has not paid dividends to shareholders, while PREIX's dividend yield for the trailing twelve months is around 2.13%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MLMIX Morgan Stanley Institutional Fund, Inc. Global Core Portfolio	0.00%	0.00%	0.17%	0.70%	0.36%	4.28%	0.00%	0.77%	0.79%	0.51%	0.00%	0.00%
PREIX T. Rowe Price Equity Index 500 Fund	2.13%	2.32%	1.17%	1.32%	1.50%	1.56%	1.97%	2.13%	2.60%	1.30%	2.03%	2.02%

Frequently Asked Questions

Can I hold both MLMIX and PREIX in my portfolio?

With a correlation of 0.92, MLMIX and PREIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, MLMIX or PREIX?

MLMIX has higher volatility (5.07%) compared to PREIX (4.77%). In terms of maximum drawdown, MLMIX dropped -35.66% vs PREIX's -55.32%.

Which has better risk-adjusted returns?

PREIX currently has the higher Sharpe Ratio (2.15 vs 1.18), 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.