NEFOX vs. TMMAX

Last updated Jun 23, 2026

NEFOX (Natixis Funds Trust II Oakmark Fund) and TMMAX (SEI Institutional Managed Trust Tax-Managed Managed Volatility Fund) are both Large Cap Value Equities funds. Over the past 10 years, NEFOX returned 13.37%/yr vs 9.77%/yr for TMMAX. A 0.79 correlation means they provide meaningful diversification when combined. NEFOX charges 1.05%/yr vs 1.00%/yr for TMMAX.

Performance

NEFOX vs. TMMAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Natixis Funds Trust II Oakmark Fund (NEFOX) and SEI Institutional Managed Trust Tax-Managed Managed Volatility Fund (TMMAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NEFOX achieves a -1.80% return, which is significantly lower than TMMAX's 2.14% return. Over the past 10 years, NEFOX has outperformed TMMAX with an annualized return of 13.37%, while TMMAX has yielded a comparatively lower 9.77% annualized return.

NEFOX

• 1D: -0.44%
• 1M: -1.07%
• YTD: -1.80%
• 6M: -2.47%
• 1Y: 9.39%
• 3Y*: 13.59%
• 5Y*: 10.36%
• 10Y*: 13.37%

TMMAX

• 1D: -0.78%
• 1M: -3.10%
• YTD: 2.14%
• 6M: 1.46%
• 1Y: 8.49%
• 3Y*: 11.24%
• 5Y*: 9.55%
• 10Y*: 9.77%

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

NEFOX vs. TMMAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NEFOX Natixis Funds Trust II Oakmark Fund	-1.80%	14.77%	15.71%	30.96%	-13.02%	33.94%	13.08%	26.76%	-13.01%	20.76%
TMMAX SEI Institutional Managed Trust Tax-Managed Managed Volatility Fund	2.14%	11.03%	17.07%	7.32%	-3.11%	24.10%	1.32%	24.00%	-2.84%	15.19%

Correlation

The correlation between NEFOX and TMMAX is 0.60, 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	0.60
Correlation (3Y) Calculated over the trailing 3-year period	0.59
Correlation (5Y) Calculated over the trailing 5-year period	0.67
Correlation (10Y) Calculated over the trailing 10-year period	0.70
Correlation (All Time) Calculated using the full available price history since Dec 21, 2007	0.79

The correlation between NEFOX and TMMAX shifts across timeframes, from 0.59 (3 years) to 0.79 (all time), reflecting how their relationship changes across market environments.

Return for Risk

NEFOX vs. TMMAX — Risk / Return Rank

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

NEFOX

NEFOX Risk / Return Rank: 14
NEFOX Sharpe Ratio Rank: 11
NEFOX Sortino Ratio Rank: 11
NEFOX Omega Ratio Rank: 10
NEFOX Calmar Ratio Rank: 22
NEFOX Martin Ratio Rank: 15

TMMAX

TMMAX Risk / Return Rank: 17
TMMAX Sharpe Ratio Rank: 15
TMMAX Sortino Ratio Rank: 15
TMMAX Omega Ratio Rank: 14
TMMAX Calmar Ratio Rank: 20
TMMAX Martin Ratio Rank: 23

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.

NEFOX vs. TMMAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Natixis Funds Trust II Oakmark Fund (NEFOX) and SEI Institutional Managed Trust Tax-Managed Managed Volatility Fund (TMMAX). 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.

	NEFOX	TMMAX	Difference
Sharpe ratio: Return per unit of total volatility	0.81	1.04	-0.23
Sortino ratio: Return per unit of downside risk	1.26	1.52	-0.25
Omega ratio: Gain probability vs. loss probability	1.15	1.18	-0.04
Calmar ratio: Return relative to maximum drawdown	1.59	1.50	+0.09
Martin ratio: Return relative to average drawdown	3.93	5.16	-1.24

NEFOX vs. TMMAX - Sharpe Ratio Comparison

The current NEFOX Sharpe Ratio is 0.81, which is comparable to the TMMAX Sharpe Ratio of 1.04. The chart below compares the historical Sharpe Ratios of NEFOX and TMMAX, 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

NEFOX vs. TMMAX - Drawdown Comparison

The maximum NEFOX drawdown since its inception was -62.35%, which is greater than TMMAX's maximum drawdown of -41.50%. Use the drawdown chart below to compare losses from any high point for NEFOX and TMMAX.

Drawdown Indicators

	NEFOX	TMMAX	Difference
Max Drawdown Largest peak-to-trough decline	-62.35%	-41.50%	-20.85%
Max Drawdown (1Y) Largest decline over 1 year	-7.07%	-5.78%	-1.29%
Max Drawdown (3Y) Largest decline over 3 years	-17.25%	-23.00%	+5.75%
Max Drawdown (5Y) Largest decline over 5 years	-23.56%	-23.00%	-0.56%
Max Drawdown (10Y) Largest decline over 10 years	-41.01%	-33.41%	-7.60%
Current Drawdown Current decline from peak	-4.40%	-8.90%	+4.50%
Average Drawdown Average peak-to-trough decline	-12.48%	-5.57%	-6.91%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.69%	1.67%	+1.02%

Volatility

NEFOX vs. TMMAX - Volatility Comparison

Natixis Funds Trust II Oakmark Fund (NEFOX) has a higher volatility of 3.98% compared to SEI Institutional Managed Trust Tax-Managed Managed Volatility Fund (TMMAX) at 2.58%. This indicates that NEFOX's price experiences larger fluctuations and is considered to be riskier than TMMAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NEFOX	TMMAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.98%	2.58%	+1.40%
Volatility (6M) Calculated over the trailing 6-month period	10.40%	6.10%	+4.30%
Volatility (1Y) Calculated over the trailing 1-year period	13.89%	8.34%	+5.55%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.23%	19.07%	+0.16%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.86%	17.81%	+3.05%

NEFOX vs. TMMAX - Expense Ratio Comparison

NEFOX has a 1.05% expense ratio, which is higher than TMMAX's 1.00% expense ratio.

Dividends

NEFOX vs. TMMAX - Dividend Comparison

NEFOX's dividend yield for the trailing twelve months is around 10.33%, less than TMMAX's 24.76% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NEFOX Natixis Funds Trust II Oakmark Fund	10.33%	7.14%	6.85%	3.62%	17.00%	7.02%	9.21%	9.34%	10.83%	4.19%	3.66%	4.01%
TMMAX SEI Institutional Managed Trust Tax-Managed Managed Volatility Fund	24.76%	25.19%	23.39%	15.23%	6.54%	4.73%	2.15%	3.67%	4.91%	4.10%	4.17%	5.57%

Frequently Asked Questions

Can I hold both NEFOX and TMMAX in my portfolio?

NEFOX and TMMAX have a correlation of 0.60, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NEFOX or TMMAX?

NEFOX has higher volatility (3.98%) compared to TMMAX (2.58%). In terms of maximum drawdown, NEFOX dropped -62.35% vs TMMAX's -41.50%.

Which has better risk-adjusted returns?

TMMAX currently has the higher Sharpe Ratio (1.04 vs 0.81), 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.