MLAAX vs. COST

Last updated Jul 14, 2026

MLAAX (MainStay Winslow Large Cap Growth Fund) is Large Cap Growth Equities fund managed by New York Life, while COST (Costco Wholesale Corporation) is a stock. Over the past 10 years, MLAAX returned 16.73%/yr vs 20.76%/yr for COST. At a 0.48 correlation, their price movements are largely independent.

Performance

MLAAX vs. COST - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MainStay Winslow Large Cap Growth Fund (MLAAX) and Costco Wholesale Corporation (COST). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MLAAX achieves a 5.35% return, which is significantly lower than COST's 7.73% return. Over the past 10 years, MLAAX has underperformed COST with an annualized return of 16.73%, while COST has yielded a comparatively higher 20.76% annualized return.

MLAAX

• 1D: 0.54%
• 1M: 3.12%
• 6M: 4.51%
• YTD: 5.35%
• 1Y: 9.63%
• 3Y*: 21.28%
• 5Y*: 10.39%
• 10Y*: 16.73%

COST

• 1D: 1.11%
• 1M: -5.69%
• 6M: -1.49%
• YTD: 7.73%
• 1Y: -3.99%
• 3Y*: 20.82%
• 5Y*: 18.99%
• 10Y*: 20.76%

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

MLAAX vs. COST - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MLAAX MainStay Winslow Large Cap Growth Fund	5.35%	14.20%	28.95%	43.10%	-31.51%	25.00%	36.95%	33.18%	3.81%	32.19%
COST Costco Wholesale Corporation	7.73%	-5.39%	39.62%	49.00%	-19.05%	51.82%	32.67%	45.70%	10.60%	22.37%

Correlation

The correlation between MLAAX and COST is -0.17, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.17
Correlation (3Y) Calculated over the trailing 3-year period	0.29
Correlation (5Y) Calculated over the trailing 5-year period	0.45
Correlation (10Y) Calculated over the trailing 10-year period	0.46
Correlation (All Time) Calculated using the full available price history since Jul 7, 1995	0.48

The correlation between MLAAX and COST shifts across timeframes, from -0.17 (1 year) to 0.48 (all time), reflecting how their relationship changes across market environments.

Return for Risk

MLAAX vs. COST — Risk / Return Rank

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

MLAAX

MLAAX Risk / Return Rank: 8
MLAAX Sharpe Ratio Rank: 9
MLAAX Sortino Ratio Rank: 9
MLAAX Omega Ratio Rank: 9
MLAAX Calmar Ratio Rank: 7
MLAAX Martin Ratio Rank: 7

COST

COST Risk / Return Rank: 34
COST Sharpe Ratio Rank: 36
COST Sortino Ratio Rank: 30
COST Omega Ratio Rank: 31
COST Calmar Ratio Rank: 37
COST Martin Ratio Rank: 35

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.

MLAAX vs. COST - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MainStay Winslow Large Cap Growth Fund (MLAAX) and Costco Wholesale Corporation (COST). 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.

	MLAAX	COST	Difference
Sharpe ratio: Return per unit of total volatility	0.51	-0.20	+0.71
Sortino ratio: Return per unit of downside risk	0.81	-0.15	+0.96
Omega ratio: Gain probability vs. loss probability	1.10	0.98	+0.12
Calmar ratio: Return relative to maximum drawdown	0.46	-0.24	+0.70
Martin ratio: Return relative to average drawdown	1.32	-0.56	+1.88

MLAAX vs. COST - Sharpe Ratio Comparison

The current MLAAX Sharpe Ratio is 0.51, which is higher than the COST Sharpe Ratio of -0.20. The chart below compares the historical Sharpe Ratios of MLAAX and COST, 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

MLAAX vs. COST - Drawdown Comparison

The maximum MLAAX drawdown since its inception was -83.01%, which is greater than COST's maximum drawdown of -53.39%. Use the drawdown chart below to compare losses from any high point for MLAAX and COST.

Drawdown Indicators

	MLAAX	COST	Difference
Max Drawdown Largest peak-to-trough decline	-83.01%	-53.39%	-29.62%
Max Drawdown (1Y) Largest decline over 1 year	-20.28%	-16.57%	-3.71%
Max Drawdown (3Y) Largest decline over 3 years	-35.43%	-20.74%	-14.69%
Max Drawdown (5Y) Largest decline over 5 years	-39.36%	-31.40%	-7.96%
Max Drawdown (10Y) Largest decline over 10 years	-39.36%	-31.40%	-7.96%
Current Drawdown Current decline from peak	-4.89%	-15.34%	+10.45%
Average Drawdown Average peak-to-trough decline	-38.69%	-13.36%	-25.33%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.01%	7.14%	-0.13%

Volatility

MLAAX vs. COST - Volatility Comparison

MainStay Winslow Large Cap Growth Fund (MLAAX) has a higher volatility of 8.20% compared to Costco Wholesale Corporation (COST) at 6.82%. This indicates that MLAAX's price experiences larger fluctuations and is considered to be riskier than COST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MLAAX	COST	Difference
Volatility (1M) Calculated over the trailing 1-month period	8.20%	6.82%	+1.38%
Volatility (6M) Calculated over the trailing 6-month period	14.84%	14.82%	+0.02%
Volatility (1Y) Calculated over the trailing 1-year period	18.35%	19.61%	-1.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	25.84%	22.86%	+2.98%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	25.80%	21.99%	+3.81%

Dividends

MLAAX vs. COST - Dividend Comparison

MLAAX's dividend yield for the trailing twelve months is around 23.13%, more than COST's 0.58% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COST Costco Wholesale Corporation	0.58%	0.59%	0.49%	2.87%	0.76%	0.54%	3.38%	0.86%	1.08%	4.81%	1.09%	4.06%
MLAAX MainStay Winslow Large Cap Growth Fund	23.13%	24.37%	22.54%	10.59%	14.95%	26.64%	5.40%	11.55%	23.59%	17.20%	13.18%	13.61%

Frequently Asked Questions

Can I hold both MLAAX and COST in my portfolio?

MLAAX and COST have a correlation of -0.17, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MLAAX or COST?

MLAAX has higher volatility (8.20%) compared to COST (6.82%). In terms of maximum drawdown, MLAAX dropped -83.01% vs COST's -53.39%.

Which has better risk-adjusted returns?

MLAAX currently has the higher Sharpe Ratio (0.51 vs -0.20), 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.