MSPIX vs. MYIIX

Last updated Jun 24, 2026

MSPIX (MainStay S&P 500 Index Fund) and MYIIX (MainStay WMC International Research Equity Fund) are both mutual funds - MSPIX is a Large Cap Blend Equities fund managed by New York Life, while MYIIX is a Foreign Large Cap Equities fund managed by New York Life. Over the past 10 years, MSPIX returned 15.51%/yr vs 8.61%/yr for MYIIX. A 0.69 correlation means they provide meaningful diversification when combined. MSPIX charges 0.25%/yr vs 0.86%/yr for MYIIX.

Performance

MSPIX vs. MYIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MainStay S&P 500 Index Fund (MSPIX) and MainStay WMC International Research Equity Fund (MYIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MSPIX achieves a 9.65% return, which is significantly lower than MYIIX's 15.35% return. Over the past 10 years, MSPIX has outperformed MYIIX with an annualized return of 15.51%, while MYIIX has yielded a comparatively lower 8.61% annualized return.

MSPIX

• 1D: -0.37%
• 1M: 0.09%
• YTD: 9.65%
• 6M: 8.66%
• 1Y: 25.19%
• 3Y*: 21.06%
• 5Y*: 13.33%
• 10Y*: 15.51%

MYIIX

• 1D: 0.34%
• 1M: 3.91%
• YTD: 15.35%
• 6M: 15.57%
• 1Y: 38.43%
• 3Y*: 21.53%
• 5Y*: 10.46%
• 10Y*: 8.61%

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

MSPIX vs. MYIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MSPIX MainStay S&P 500 Index Fund	9.65%	17.55%	24.31%	26.29%	-18.33%	28.46%	18.14%	31.02%	-4.47%	21.38%
MYIIX MainStay WMC International Research Equity Fund	15.35%	39.10%	7.56%	13.56%	-15.94%	10.65%	1.75%	17.15%	-23.31%	23.20%

Correlation

The correlation between MSPIX and MYIIX is 0.59, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.59
Correlation (3Y) Calculated over the trailing 3-year period	0.60
Correlation (5Y) Calculated over the trailing 5-year period	0.67
Correlation (10Y) Calculated over the trailing 10-year period	0.64
Correlation (All Time) Calculated using the full available price history since Sep 28, 2007	0.69

The correlation between MSPIX and MYIIX has been stable across timeframes, ranging from 0.59 to 0.69 - a consistent structural relationship.

Return for Risk

MSPIX vs. MYIIX — Risk / Return Rank

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

MSPIX

MSPIX Risk / Return Rank: 64
MSPIX Sharpe Ratio Rank: 62
MSPIX Sortino Ratio Rank: 56
MSPIX Omega Ratio Rank: 58
MSPIX Calmar Ratio Rank: 66
MSPIX Martin Ratio Rank: 76

MYIIX

MYIIX Risk / Return Rank: 82
MYIIX Sharpe Ratio Rank: 89
MYIIX Sortino Ratio Rank: 81
MYIIX Omega Ratio Rank: 83
MYIIX Calmar Ratio Rank: 80
MYIIX Martin Ratio Rank: 75

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.

MSPIX vs. MYIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MainStay S&P 500 Index Fund (MSPIX) and MainStay WMC International Research Equity Fund (MYIIX). 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.

	MSPIX	MYIIX	Difference
Sharpe ratio: Return per unit of total volatility	2.13	2.71	-0.58
Sortino ratio: Return per unit of downside risk	2.89	3.54	-0.66
Omega ratio: Gain probability vs. loss probability	1.39	1.51	-0.13
Calmar ratio: Return relative to maximum drawdown	2.98	3.46	-0.48
Martin ratio: Return relative to average drawdown	13.42	13.32	+0.10

MSPIX vs. MYIIX - Sharpe Ratio Comparison

The current MSPIX Sharpe Ratio is 2.13, which is comparable to the MYIIX Sharpe Ratio of 2.71. The chart below compares the historical Sharpe Ratios of MSPIX and MYIIX, 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

MSPIX vs. MYIIX - Drawdown Comparison

The maximum MSPIX drawdown since its inception was -55.30%, smaller than the maximum MYIIX drawdown of -62.79%. Use the drawdown chart below to compare losses from any high point for MSPIX and MYIIX.

Drawdown Indicators

	MSPIX	MYIIX	Difference
Max Drawdown Largest peak-to-trough decline	-55.30%	-62.79%	+7.49%
Max Drawdown (1Y) Largest decline over 1 year	-8.93%	-11.17%	+2.24%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-13.81%	-4.95%
Max Drawdown (5Y) Largest decline over 5 years	-24.64%	-30.71%	+6.07%
Max Drawdown (10Y) Largest decline over 10 years	-33.78%	-44.88%	+11.10%
Current Drawdown Current decline from peak	-1.72%	0.00%	-1.72%
Average Drawdown Average peak-to-trough decline	-8.69%	-17.14%	+8.45%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.98%	2.89%	-0.91%

Volatility

MSPIX vs. MYIIX - Volatility Comparison

The current volatility for MainStay S&P 500 Index Fund (MSPIX) is 4.67%, while MainStay WMC International Research Equity Fund (MYIIX) has a volatility of 5.84%. This indicates that MSPIX experiences smaller price fluctuations and is considered to be less risky than MYIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MSPIX	MYIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.67%	5.84%	-1.17%
Volatility (6M) Calculated over the trailing 6-month period	9.90%	12.22%	-2.32%
Volatility (1Y) Calculated over the trailing 1-year period	12.51%	14.29%	-1.78%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.00%	15.34%	+1.66%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.13%	16.03%	+2.10%

MSPIX vs. MYIIX - Expense Ratio Comparison

MSPIX has a 0.25% expense ratio, which is lower than MYIIX's 0.86% expense ratio.

Dividends

MSPIX vs. MYIIX - Dividend Comparison

MSPIX's dividend yield for the trailing twelve months is around 1.14%, less than MYIIX's 2.53% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MSPIX MainStay S&P 500 Index Fund	1.14%	1.25%	5.31%	4.17%	10.37%	4.57%	8.86%	17.41%	14.61%	15.26%	9.79%	5.75%
MYIIX MainStay WMC International Research Equity Fund	2.53%	2.92%	1.88%	2.05%	1.98%	2.74%	2.13%	10.18%	6.35%	1.76%	3.16%	0.90%

Frequently Asked Questions

Can I hold both MSPIX and MYIIX in my portfolio?

MSPIX and MYIIX have a correlation of 0.59, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MSPIX or MYIIX?

MYIIX has higher volatility (5.84%) compared to MSPIX (4.67%). In terms of maximum drawdown, MSPIX dropped -55.30% vs MYIIX's -62.79%.

Which has better risk-adjusted returns?

MYIIX currently has the higher Sharpe Ratio (2.71 vs 2.13), 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.