NEFSX vs. ONERX

Last updated Jun 4, 2026

NEFSX (Natixis Funds Trust I U.S. Equity Opportunities Fund) and ONERX (One Rock Fund) are both Large Cap Growth Equities funds. Over the past 5 years, NEFSX returned 10.95%/yr vs 34.52%/yr for ONERX. A 0.71 correlation means they provide meaningful diversification when combined. NEFSX charges 1.14%/yr vs 1.75%/yr for ONERX.

Performance

NEFSX vs. ONERX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Natixis Funds Trust I U.S. Equity Opportunities Fund (NEFSX) and One Rock Fund (ONERX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NEFSX achieves a 0.81% return, which is significantly lower than ONERX's 66.81% return.

NEFSX

• 1D: -1.13%
• 1M: 2.39%
• YTD: 0.81%
• 6M: 2.20%
• 1Y: 14.35%
• 3Y*: 19.30%
• 5Y*: 10.95%
• 10Y*: 15.08%

ONERX

• 1D: 3.19%
• 1M: 23.36%
• YTD: 66.81%
• 6M: 66.34%
• 1Y: 129.67%
• 3Y*: 57.09%
• 5Y*: 34.52%
• 10Y*: —

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

NEFSX vs. ONERX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
NEFSX Natixis Funds Trust I U.S. Equity Opportunities Fund	0.81%	17.23%	25.79%	37.13%	-21.15%	23.21%	46.56%
ONERX One Rock Fund	66.81%	49.37%	21.76%	72.41%	-42.06%	45.70%	104.46%

Correlation

The correlation between NEFSX and ONERX is 0.40, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.40
Correlation (3Y) Calculated over the trailing 3-year period	0.59
Correlation (5Y) Calculated over the trailing 5-year period	0.72
Correlation (All Time) Calculated using the full available price history since Mar 16, 2020	0.71

Over the past year, the correlation between NEFSX and ONERX has dropped to 0.40 - well below their long-term average of 0.71, suggesting their price drivers have been diverging.

Return for Risk

NEFSX vs. ONERX — Risk / Return Rank

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

NEFSX

NEFSX Risk / Return Rank: 22
NEFSX Sharpe Ratio Rank: 24
NEFSX Sortino Ratio Rank: 23
NEFSX Omega Ratio Rank: 23
NEFSX Calmar Ratio Rank: 20
NEFSX Martin Ratio Rank: 19

ONERX

ONERX Risk / Return Rank: 88
ONERX Sharpe Ratio Rank: 97
ONERX Sortino Ratio Rank: 73
ONERX Omega Ratio Rank: 77
ONERX Calmar Ratio Rank: 98
ONERX Martin Ratio Rank: 97

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.

NEFSX vs. ONERX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Natixis Funds Trust I U.S. Equity Opportunities Fund (NEFSX) and One Rock Fund (ONERX). 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.

	NEFSX	ONERX	Difference
Sharpe ratio: Return per unit of total volatility	1.40	3.59	-2.18
Sortino ratio: Return per unit of downside risk	2.00	3.57	-1.57
Omega ratio: Gain probability vs. loss probability	1.25	1.50	-0.25
Calmar ratio: Return relative to maximum drawdown	1.63	7.71	-6.08
Martin ratio: Return relative to average drawdown	5.12	27.26	-22.14
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

NEFSX vs. ONERX - Sharpe Ratio Comparison

The current NEFSX Sharpe Ratio is 1.40, which is lower than the ONERX Sharpe Ratio of 3.59. The chart below compares the historical Sharpe Ratios of NEFSX and ONERX, 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

	NEFSX	ONERX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.40	3.59	-2.18
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.58	0.89	-0.30
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.78	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.60	1.11	-0.52

Drawdowns

NEFSX vs. ONERX - Drawdown Comparison

The maximum NEFSX drawdown since its inception was -55.83%, which is greater than ONERX's maximum drawdown of -47.44%. Use the drawdown chart below to compare losses from any high point for NEFSX and ONERX.

Drawdown Indicators

	NEFSX	ONERX	Difference
Max Drawdown Largest peak-to-trough decline	-55.83%	-47.44%	-8.39%
Max Drawdown (1Y) Largest decline over 1 year	-11.20%	-17.63%	+6.43%
Max Drawdown (3Y) Largest decline over 3 years	-19.58%	-47.44%	+27.86%
Max Drawdown (5Y) Largest decline over 5 years	-30.08%	-47.44%	+17.36%
Max Drawdown (10Y) Largest decline over 10 years	-32.27%	—	—
Current Drawdown Current decline from peak	-1.13%	0.00%	-1.13%
Average Drawdown Average peak-to-trough decline	-11.75%	-13.80%	+2.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.86%	4.98%	-1.12%

Volatility

NEFSX vs. ONERX - Volatility Comparison

The current volatility for Natixis Funds Trust I U.S. Equity Opportunities Fund (NEFSX) is 2.86%, while One Rock Fund (ONERX) has a volatility of 11.93%. This indicates that NEFSX experiences smaller price fluctuations and is considered to be less risky than ONERX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NEFSX	ONERX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.86%	11.93%	-9.07%
Volatility (6M) Calculated over the trailing 6-month period	10.28%	29.84%	-19.56%
Volatility (1Y) Calculated over the trailing 1-year period	12.99%	37.90%	-24.91%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.59%	39.12%	-19.53%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.71%	38.21%	-18.50%

NEFSX vs. ONERX - Expense Ratio Comparison

NEFSX has a 1.14% expense ratio, which is lower than ONERX's 1.75% expense ratio.

Dividends

NEFSX vs. ONERX - Dividend Comparison

NEFSX's dividend yield for the trailing twelve months is around 9.23%, less than ONERX's 14.46% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NEFSX Natixis Funds Trust I U.S. Equity Opportunities Fund	9.23%	5.92%	6.38%	8.13%	18.10%	11.12%	13.07%	10.85%	11.18%	3.55%	1.88%	5.09%
ONERX One Rock Fund	14.46%	24.12%	0.00%	0.00%	10.57%	28.88%	18.66%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both NEFSX and ONERX in my portfolio?

NEFSX and ONERX have a correlation of 0.40, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NEFSX or ONERX?

ONERX has higher volatility (11.93%) compared to NEFSX (2.86%). In terms of maximum drawdown, NEFSX dropped -55.83% vs ONERX's -47.44%.

Which has better risk-adjusted returns?

ONERX currently has the higher Sharpe Ratio (3.59 vs 1.40), 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.