MOPIX vs. DFSTX

Last updated Jun 3, 2026

MOPIX (MainStay WMC Small Companies Fund) and DFSTX (DFA U.S. Small Cap Portfolio) are both Small Cap Blend Equities funds. Over the past 10 years, MOPIX returned 9.27%/yr vs 10.85%/yr for DFSTX. Their correlation of 0.94 suggests significant overlap in exposure. MOPIX charges 0.97%/yr vs 0.27%/yr for DFSTX.

Performance

MOPIX vs. DFSTX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MainStay WMC Small Companies Fund (MOPIX) and DFA U.S. Small Cap Portfolio (DFSTX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MOPIX achieves a 26.74% return, which is significantly higher than DFSTX's 13.83% return. Over the past 10 years, MOPIX has underperformed DFSTX with an annualized return of 9.27%, while DFSTX has yielded a comparatively higher 10.85% annualized return.

MOPIX

• 1D: 0.71%
• 1M: 8.90%
• YTD: 26.74%
• 6M: 28.73%
• 1Y: 57.99%
• 3Y*: 22.88%
• 5Y*: 8.77%
• 10Y*: 9.27%

DFSTX

• 1D: 0.08%
• 1M: 1.80%
• YTD: 13.83%
• 6M: 14.64%
• 1Y: 30.03%
• 3Y*: 15.95%
• 5Y*: 7.88%
• 10Y*: 10.85%

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

MOPIX vs. DFSTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MOPIX MainStay WMC Small Companies Fund	26.74%	12.69%	16.07%	10.97%	-19.00%	17.55%	10.04%	17.70%	-16.42%	15.68%
DFSTX DFA U.S. Small Cap Portfolio	13.83%	8.07%	11.50%	17.66%	-13.50%	30.50%	11.19%	21.78%	-13.20%	11.19%

Correlation

The correlation between MOPIX and DFSTX 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	0.94
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Mar 20, 1992	0.94

The correlation between MOPIX and DFSTX has been stable across timeframes, ranging from 0.92 to 0.95 - a consistent structural relationship.

Return for Risk

MOPIX vs. DFSTX — Risk / Return Rank

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

MOPIX

MOPIX Risk / Return Rank: 90
MOPIX Sharpe Ratio Rank: 93
MOPIX Sortino Ratio Rank: 89
MOPIX Omega Ratio Rank: 79
MOPIX Calmar Ratio Rank: 95
MOPIX Martin Ratio Rank: 95

DFSTX

DFSTX Risk / Return Rank: 47
DFSTX Sharpe Ratio Rank: 38
DFSTX Sortino Ratio Rank: 40
DFSTX Omega Ratio Rank: 34
DFSTX Calmar Ratio Rank: 70
DFSTX Martin Ratio Rank: 54

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.

MOPIX vs. DFSTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MainStay WMC Small Companies Fund (MOPIX) and DFA U.S. Small Cap Portfolio (DFSTX). 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.

	MOPIX	DFSTX	Difference
Sharpe ratio Return per unit of total volatility	3.15	1.79	+1.36
Sortino ratio Return per unit of downside risk	4.31	2.63	+1.68
Omega ratio Gain probability vs. loss probability	1.52	1.31	+0.21
Calmar ratio Return relative to maximum drawdown	5.92	3.24	+2.69
Martin ratio Return relative to average drawdown	22.44	11.01	+11.43
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MOPIX vs. DFSTX - Sharpe Ratio Comparison

The current MOPIX Sharpe Ratio is 3.15, which is higher than the DFSTX Sharpe Ratio of 1.79. The chart below compares the historical Sharpe Ratios of MOPIX and DFSTX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	MOPIX	DFSTX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.15	1.79	+1.36
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.39	0.39	0.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.40	0.49	-0.10
Sharpe Ratio (All Time) Calculated using the full available price history	0.49	0.50	-0.01

Drawdowns

MOPIX vs. DFSTX - Drawdown Comparison

The maximum MOPIX drawdown since its inception was -68.08%, which is greater than DFSTX's maximum drawdown of -60.99%. Use the drawdown chart below to compare losses from any high point for MOPIX and DFSTX.

Drawdown Indicators

	MOPIX	DFSTX	Difference
Max Drawdown Largest peak-to-trough decline	-68.08%	-60.99%	-7.09%
Max Drawdown (1Y) Largest decline over 1 year	-9.84%	-9.16%	-0.68%
Max Drawdown (3Y) Largest decline over 3 years	-26.99%	-25.91%	-1.08%
Max Drawdown (5Y) Largest decline over 5 years	-32.60%	-25.91%	-6.69%
Max Drawdown (10Y) Largest decline over 10 years	-48.01%	-44.78%	-3.23%
Current Drawdown Current decline from peak	0.00%	-0.47%	+0.47%
Average Drawdown Average peak-to-trough decline	-9.11%	-8.77%	-0.34%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.60%	2.69%	-0.09%

Volatility

MOPIX vs. DFSTX - Volatility Comparison

MainStay WMC Small Companies Fund (MOPIX) has a higher volatility of 5.92% compared to DFA U.S. Small Cap Portfolio (DFSTX) at 4.40%. This indicates that MOPIX's price experiences larger fluctuations and is considered to be riskier than DFSTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MOPIX	DFSTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.92%	4.40%	+1.52%
Volatility (6M) Calculated over the trailing 6-month period	13.71%	11.55%	+2.16%
Volatility (1Y) Calculated over the trailing 1-year period	18.71%	16.78%	+1.93%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.81%	20.56%	+2.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.38%	22.08%	+1.30%

MOPIX vs. DFSTX - Expense Ratio Comparison

MOPIX has a 0.97% expense ratio, which is higher than DFSTX's 0.27% expense ratio.

Dividends

MOPIX vs. DFSTX - Dividend Comparison

MOPIX's dividend yield for the trailing twelve months is around 0.12%, less than DFSTX's 0.95% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
DFSTX DFA U.S. Small Cap Portfolio	0.95%	1.08%	1.05%	2.45%	5.18%	6.39%	1.08%	3.30%	5.16%	4.56%	3.10%	5.90%
MOPIX MainStay WMC Small Companies Fund	0.12%	0.15%	0.39%	0.33%	2.34%	29.42%	0.00%	0.50%	18.09%	8.32%	0.59%	0.37%

Frequently Asked Questions

Can I hold both MOPIX and DFSTX in my portfolio?

With a correlation of 0.92, MOPIX and DFSTX 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, MOPIX or DFSTX?

MOPIX has higher volatility (5.92%) compared to DFSTX (4.40%). In terms of maximum drawdown, MOPIX dropped -68.08% vs DFSTX's -60.99%.

Which has better risk-adjusted returns?

MOPIX currently has the higher Sharpe Ratio (3.15 vs 1.79), 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.