NEFSX vs. FXAIX

Last updated Jun 23, 2026

NEFSX (Natixis Funds Trust I U.S. Equity Opportunities Fund) and FXAIX (Fidelity 500 Index Fund) are both mutual funds - NEFSX is a Large Cap Growth Equities fund managed by Natixis, while FXAIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, NEFSX returned 14.91%/yr vs 15.58%/yr for FXAIX. Their correlation of 0.92 suggests significant overlap in exposure. NEFSX charges 1.14%/yr vs 0.02%/yr for FXAIX.

Performance

NEFSX vs. FXAIX - 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 Fidelity 500 Index Fund (FXAIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NEFSX achieves a -1.97% return, which is significantly lower than FXAIX's 10.19% return. Both investments have delivered pretty close results over the past 10 years, with NEFSX having a 14.91% annualized return and FXAIX not far ahead at 15.58%.

NEFSX

• 1D: 0.23%
• 1M: -1.73%
• YTD: -1.97%
• 6M: -2.72%
• 1Y: 9.54%
• 3Y*: 16.79%
• 5Y*: 10.87%
• 10Y*: 14.91%

FXAIX

• 1D: 1.09%
• 1M: 0.47%
• YTD: 10.19%
• 6M: 9.68%
• 1Y: 27.18%
• 3Y*: 20.98%
• 5Y*: 14.10%
• 10Y*: 15.58%

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

NEFSX vs. FXAIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NEFSX Natixis Funds Trust I U.S. Equity Opportunities Fund	-1.97%	17.23%	25.79%	37.13%	-21.15%	23.21%	22.12%	31.08%	-6.67%	26.28%
FXAIX Fidelity 500 Index Fund	10.19%	17.84%	25.01%	26.29%	-18.14%	28.71%	18.42%	31.48%	-4.43%	21.82%

Correlation

The correlation between NEFSX and FXAIX is 0.69, 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	0.69
Correlation (3Y) Calculated over the trailing 3-year period	0.75
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (10Y) Calculated over the trailing 10-year period	0.90
Correlation (All Time) Calculated using the full available price history since May 4, 2011	0.92

Over the past year, the correlation between NEFSX and FXAIX has dropped to 0.69 - well below their long-term average of 0.92, suggesting their price drivers have been diverging.

Return for Risk

NEFSX vs. FXAIX — Risk / Return Rank

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

NEFSX

NEFSX Risk / Return Rank: 11
NEFSX Sharpe Ratio Rank: 11
NEFSX Sortino Ratio Rank: 11
NEFSX Omega Ratio Rank: 11
NEFSX Calmar Ratio Rank: 11
NEFSX Martin Ratio Rank: 12

FXAIX

FXAIX Risk / Return Rank: 66
FXAIX Sharpe Ratio Rank: 64
FXAIX Sortino Ratio Rank: 59
FXAIX Omega Ratio Rank: 61
FXAIX Calmar Ratio Rank: 68
FXAIX Martin Ratio Rank: 79

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. FXAIX - 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 Fidelity 500 Index Fund (FXAIX). 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.

	NEFSX	FXAIX	Difference
Sharpe ratio: Return per unit of total volatility	0.86	2.17	-1.31
Sortino ratio: Return per unit of downside risk	1.26	2.93	-1.67
Omega ratio: Gain probability vs. loss probability	1.15	1.39	-0.24
Calmar ratio: Return relative to maximum drawdown	1.02	3.04	-2.02
Martin ratio: Return relative to average drawdown	3.16	13.75	-10.59

NEFSX vs. FXAIX - Sharpe Ratio Comparison

The current NEFSX Sharpe Ratio is 0.86, which is lower than the FXAIX Sharpe Ratio of 2.17. The chart below compares the historical Sharpe Ratios of NEFSX and FXAIX, 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

NEFSX vs. FXAIX - Drawdown Comparison

The maximum NEFSX drawdown since its inception was -55.83%, which is greater than FXAIX's maximum drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for NEFSX and FXAIX.

Drawdown Indicators

	NEFSX	FXAIX	Difference
Max Drawdown Largest peak-to-trough decline	-55.83%	-33.79%	-22.04%
Max Drawdown (1Y) Largest decline over 1 year	-11.20%	-8.89%	-2.31%
Max Drawdown (3Y) Largest decline over 3 years	-19.58%	-18.76%	-0.82%
Max Drawdown (5Y) Largest decline over 5 years	-30.08%	-24.50%	-5.58%
Max Drawdown (10Y) Largest decline over 10 years	-32.27%	-33.79%	+1.52%
Current Drawdown Current decline from peak	-3.85%	-1.36%	-2.49%
Average Drawdown Average peak-to-trough decline	-11.73%	-3.79%	-7.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.34%	1.96%	+1.38%

Volatility

NEFSX vs. FXAIX - Volatility Comparison

The current volatility for Natixis Funds Trust I U.S. Equity Opportunities Fund (NEFSX) is 4.43%, while Fidelity 500 Index Fund (FXAIX) has a volatility of 4.77%. This indicates that NEFSX experiences smaller price fluctuations and is considered to be less risky than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NEFSX	FXAIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.43%	4.77%	-0.34%
Volatility (6M) Calculated over the trailing 6-month period	10.37%	9.91%	+0.46%
Volatility (1Y) Calculated over the trailing 1-year period	13.33%	12.47%	+0.86%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.64%	17.01%	+2.63%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.73%	18.11%	+1.62%

NEFSX vs. FXAIX - Expense Ratio Comparison

NEFSX has a 1.14% expense ratio, which is higher than FXAIX's 0.02% expense ratio.

Dividends

NEFSX vs. FXAIX - Dividend Comparison

NEFSX's dividend yield for the trailing twelve months is around 9.49%, more than FXAIX's 1.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FXAIX Fidelity 500 Index Fund	1.04%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%
NEFSX Natixis Funds Trust I U.S. Equity Opportunities Fund	9.49%	5.92%	6.38%	8.13%	18.10%	11.12%	13.07%	10.85%	11.18%	3.55%	1.88%	5.09%

Frequently Asked Questions

Can I hold both NEFSX and FXAIX in my portfolio?

NEFSX and FXAIX have a correlation of 0.69, 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 FXAIX?

FXAIX has higher volatility (4.77%) compared to NEFSX (4.43%). In terms of maximum drawdown, NEFSX dropped -55.83% vs FXAIX's -33.79%.

Which has better risk-adjusted returns?

FXAIX currently has the higher Sharpe Ratio (2.17 vs 0.86), 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.