GWETX vs. FSSNX

Last updated Jun 6, 2026

GWETX (AMG GW&K Small Cap Core Fund) and FSSNX (Fidelity Small Cap Index Fund) are both Small Cap Blend Equities funds. Over the past 10 years, GWETX returned 9.67%/yr vs 11.11%/yr for FSSNX. With a 0.96 correlation, they move nearly in lockstep. GWETX charges 1.30%/yr vs 0.03%/yr for FSSNX.

Performance

GWETX vs. FSSNX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG GW&K Small Cap Core Fund (GWETX) and Fidelity Small Cap Index Fund (FSSNX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, GWETX achieves a 12.10% return, which is significantly lower than FSSNX's 18.88% return. Over the past 10 years, GWETX has underperformed FSSNX with an annualized return of 9.67%, while FSSNX has yielded a comparatively higher 11.11% annualized return.

GWETX

• 1D: 1.33%
• 1M: -0.31%
• YTD: 12.10%
• 6M: 1.64%
• 1Y: 17.50%
• 3Y*: 11.66%
• 5Y*: 3.63%
• 10Y*: 9.67%

FSSNX

• 1D: 1.46%
• 1M: 1.83%
• YTD: 18.88%
• 6M: 17.16%
• 1Y: 41.90%
• 3Y*: 19.33%
• 5Y*: 6.69%
• 10Y*: 11.11%

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

GWETX vs. FSSNX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
GWETX AMG GW&K Small Cap Core Fund	12.10%	-0.62%	13.60%	8.03%	-16.60%	21.09%	17.72%	38.10%	-14.03%	20.32%
FSSNX Fidelity Small Cap Index Fund	18.88%	12.94%	11.71%	17.11%	-20.28%	14.70%	19.99%	25.70%	-11.24%	14.54%

Correlation

The correlation between GWETX and FSSNX is 0.93, 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	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.96
Correlation (All Time) Calculated using the full available price history since Sep 12, 2011	0.96

The correlation between GWETX and FSSNX has been stable across timeframes, ranging from 0.93 to 0.96 - a consistent structural relationship.

Return for Risk

GWETX vs. FSSNX — Risk / Return Rank

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

GWETX

GWETX Risk / Return Rank: 13
GWETX Sharpe Ratio Rank: 12
GWETX Sortino Ratio Rank: 12
GWETX Omega Ratio Rank: 13
GWETX Calmar Ratio Rank: 16
GWETX Martin Ratio Rank: 14

FSSNX

FSSNX Risk / Return Rank: 64
FSSNX Sharpe Ratio Rank: 59
FSSNX Sortino Ratio Rank: 56
FSSNX Omega Ratio Rank: 47
FSSNX Calmar Ratio Rank: 84
FSSNX Martin Ratio Rank: 75

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.

GWETX vs. FSSNX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG GW&K Small Cap Core Fund (GWETX) and Fidelity Small Cap Index Fund (FSSNX). 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.

	GWETX	FSSNX	Difference
Sharpe ratio: Return per unit of total volatility	0.90	2.19	-1.29
Sortino ratio: Return per unit of downside risk	1.29	3.02	-1.74
Omega ratio: Gain probability vs. loss probability	1.18	1.36	-0.18
Calmar ratio: Return relative to maximum drawdown	1.31	3.82	-2.51
Martin ratio: Return relative to average drawdown	3.71	13.57	-9.86
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

GWETX vs. FSSNX - Sharpe Ratio Comparison

The current GWETX Sharpe Ratio is 0.90, which is lower than the FSSNX Sharpe Ratio of 2.19. The chart below compares the historical Sharpe Ratios of GWETX and FSSNX, 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

	GWETX	FSSNX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.90	2.19	-1.29
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.17	0.30	-0.13
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.44	0.48	-0.04
Sharpe Ratio (All Time) Calculated using the full available price history	0.24	0.54	-0.30

Drawdowns

GWETX vs. FSSNX - Drawdown Comparison

The maximum GWETX drawdown since its inception was -67.27%, which is greater than FSSNX's maximum drawdown of -41.72%. Use the drawdown chart below to compare losses from any high point for GWETX and FSSNX.

Drawdown Indicators

	GWETX	FSSNX	Difference
Max Drawdown Largest peak-to-trough decline	-67.27%	-41.72%	-25.55%
Max Drawdown (1Y) Largest decline over 1 year	-13.26%	-11.00%	-2.26%
Max Drawdown (3Y) Largest decline over 3 years	-24.48%	-27.45%	+2.97%
Max Drawdown (5Y) Largest decline over 5 years	-30.50%	-31.87%	+1.37%
Max Drawdown (10Y) Largest decline over 10 years	-41.37%	-41.72%	+0.35%
Current Drawdown Current decline from peak	-0.31%	0.00%	-0.31%
Average Drawdown Average peak-to-trough decline	-19.30%	-8.29%	-11.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.67%	3.09%	+1.58%

Volatility

GWETX vs. FSSNX - Volatility Comparison

The current volatility for AMG GW&K Small Cap Core Fund (GWETX) is 4.87%, while Fidelity Small Cap Index Fund (FSSNX) has a volatility of 5.67%. This indicates that GWETX experiences smaller price fluctuations and is considered to be less risky than FSSNX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GWETX	FSSNX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.87%	5.67%	-0.80%
Volatility (6M) Calculated over the trailing 6-month period	15.45%	13.66%	+1.79%
Volatility (1Y) Calculated over the trailing 1-year period	19.40%	19.18%	+0.22%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.33%	22.60%	-1.27%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.21%	23.45%	-1.24%

GWETX vs. FSSNX - Expense Ratio Comparison

GWETX has a 1.30% expense ratio, which is higher than FSSNX's 0.03% expense ratio.

Dividends

GWETX vs. FSSNX - Dividend Comparison

GWETX has not paid dividends to shareholders, while FSSNX's dividend yield for the trailing twelve months is around 0.91%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSSNX Fidelity Small Cap Index Fund	0.91%	1.08%	1.04%	1.43%	1.26%	3.92%	0.94%	2.96%	4.94%	3.37%	2.27%	2.66%
GWETX AMG GW&K Small Cap Core Fund	0.00%	0.00%	4.04%	0.70%	0.75%	9.16%	2.43%	10.50%	14.38%	5.46%	4.24%	4.10%

Frequently Asked Questions

Can I hold both GWETX and FSSNX in my portfolio?

With a correlation of 0.93, GWETX and FSSNX 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, GWETX or FSSNX?

FSSNX has higher volatility (5.67%) compared to GWETX (4.87%). In terms of maximum drawdown, GWETX dropped -67.27% vs FSSNX's -41.72%.

Which has better risk-adjusted returns?

FSSNX currently has the higher Sharpe Ratio (2.19 vs 0.90), 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.