FSOPX vs. FSSNX

Last updated Aug 1, 2026

FSOPX (Fidelity Series Small Cap Opportunities Fund) and FSSNX (Fidelity Small Cap Index Fund) are both Small Cap Blend Equities funds from Fidelity. Over the past 10 years, FSOPX returned 12.83%/yr vs 10.75%/yr for FSSNX. Their 0.98 correlation means they have historically moved very closely together. FSOPX charges 0.00%/yr vs 0.03%/yr for FSSNX.

Performance

FSOPX vs. FSSNX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Series Small Cap Opportunities Fund (FSOPX) 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, FSOPX achieves a 21.27% return, which is significantly higher than FSSNX's 19.50% return. Over the past 10 years, FSOPX has outperformed FSSNX with an annualized return of 12.83%, while FSSNX has yielded a comparatively lower 10.75% annualized return.

FSOPX

• 1D: 1.81%
• 1M: -0.30%
• 6M: 14.63%
• YTD: 21.27%
• 1Y: 39.87%
• 3Y*: 19.09%
• 5Y*: 11.88%
• 10Y*: 12.83%
• ALL TIME*: 9.29%

FSSNX

• 1D: 1.37%
• 1M: -1.63%
• 6M: 13.42%
• YTD: 19.50%
• 1Y: 37.75%
• 3Y*: 15.41%
• 5Y*: 7.34%
• 10Y*: 10.75%
• ALL TIME*: 11.80%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
FSOPX Fidelity Series Small Cap Opportunities Fund	$0.00	$0.00	$0.00
FSSNX Fidelity Small Cap Index Fund	$0.00	$0.00	$0.00

FSOPX vs. FSSNX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FSOPX Fidelity Series Small Cap Opportunities Fund	21.27%	15.81%	15.31%	20.38%	-17.82%	23.39%	17.03%	29.92%	-8.12%	11.10%
FSSNX Fidelity Small Cap Index Fund	19.50%	12.94%	11.71%	17.11%	-20.28%	14.70%	19.99%	25.70%	-11.24%	14.54%

Correlation

The correlation between FSOPX and FSSNX is 0.93, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.93
Correlation (3Y) Balances recent behavior with more history.	0.96
Correlation (5Y) Shows whether the relationship held over a longer period.	0.97
Correlation (10Y) Provides a long-term view across more market conditions.	0.97
Correlation (All Time) Calculated using the full available price history since Sep 9, 2011	0.98

The correlation between FSOPX and FSSNX has been stable across timeframes, ranging from 0.93 to 0.98 - a consistent structural relationship.

Return for Risk

FSOPX vs. FSSNX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

FSOPX

FSOPX Risk / Return Rank: 85
FSOPX Sharpe Ratio Rank: 82
FSOPX Sortino Ratio Rank: 81
FSOPX Omega Ratio Rank: 75
FSOPX Calmar Ratio Rank: 92
FSOPX Martin Ratio Rank: 93

FSSNX

FSSNX Risk / Return Rank: 79
FSSNX Sharpe Ratio Rank: 77
FSSNX Sortino Ratio Rank: 75
FSSNX Omega Ratio Rank: 69
FSSNX Calmar Ratio Rank: 88
FSSNX Martin Ratio Rank: 87

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

FSOPX vs. FSSNX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Series Small Cap Opportunities Fund (FSOPX) 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.

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.

	FSOPX	FSSNX	Difference
Sharpe ratio: Return per unit of total volatility	1.95	1.74	+0.20
Sortino ratio: Return per unit of downside risk	2.82	2.49	+0.34
Omega ratio: Gain probability vs. loss probability	1.33	1.29	+0.04
Calmar ratio: Return relative to maximum drawdown	3.64	3.08	+0.56
Martin ratio: Return relative to average drawdown	13.81	10.93	+2.88

FSOPX vs. FSSNX - Sharpe Ratio Comparison

The current FSOPX Sharpe Ratio is 1.95, which is comparable to the FSSNX Sharpe Ratio of 1.74. The chart below compares the historical Sharpe Ratios of FSOPX 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.

Drawdowns

FSOPX vs. FSSNX - Drawdown Comparison

The maximum FSOPX drawdown since its inception was -61.75%, which is greater than FSSNX's maximum drawdown of -41.72%. Use the drawdown chart below to compare losses from any high point for FSOPX and FSSNX.

Drawdown Indicators

	FSOPX	FSSNX	Difference
Max Drawdown Largest peak-to-trough decline	-61.75%	-41.72%	-20.03%
Max Drawdown (1Y) Largest decline over 1 year	-9.99%	-11.00%	+1.01%
Max Drawdown (3Y) Largest decline over 3 years	-27.17%	-27.45%	+0.28%
Max Drawdown (5Y) Largest decline over 5 years	-30.06%	-31.87%	+1.81%
Max Drawdown (10Y) Largest decline over 10 years	-39.15%	-41.72%	+2.57%
Current Drawdown Current decline from peak	-2.67%	-2.53%	-0.14%
Average Drawdown Average peak-to-trough decline	-10.30%	-8.22%	-2.08%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.63%	3.10%	-0.47%

Volatility

FSOPX vs. FSSNX - Volatility Comparison

Fidelity Series Small Cap Opportunities Fund (FSOPX) has a higher volatility of 4.54% compared to Fidelity Small Cap Index Fund (FSSNX) at 3.81%. This indicates that FSOPX's price experiences larger fluctuations and is considered to be riskier than FSSNX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FSOPX	FSSNX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.54%	3.81%	+0.73%
Volatility (6M) Calculated over the trailing 6-month period	14.38%	14.14%	+0.24%
Volatility (1Y) Calculated over the trailing 1-year period	18.67%	19.42%	-0.75%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.74%	22.55%	-0.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.99%	23.42%	-1.43%

FSOPX vs. FSSNX - Expense Ratio Comparison

FSOPX has a 0.00% expense ratio, which is lower than FSSNX's 0.03% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

FSOPX vs. FSSNX - Dividend Comparison

FSOPX's dividend yield for the trailing twelve months is around 3.64%, more than FSSNX's 1.05% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSOPX Fidelity Series Small Cap Opportunities Fund	3.64%	4.41%	9.41%	0.98%	5.16%	30.85%	2.01%	6.67%	13.99%	10.31%	0.69%	5.93%
FSSNX Fidelity Small Cap Index Fund	1.05%	1.08%	1.04%	1.43%	1.26%	3.92%	0.94%	2.96%	4.94%	3.37%	2.27%	2.66%

Frequently Asked Questions

Can I hold both FSOPX and FSSNX in my portfolio?

With a correlation of 0.93, FSOPX 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, FSOPX or FSSNX?

FSOPX has higher volatility (4.54%) compared to FSSNX (3.81%). In terms of maximum drawdown, FSOPX dropped -61.75% vs FSSNX's -41.72%.

Which has better risk-adjusted returns?

FSOPX currently has the higher Sharpe Ratio (1.95 vs 1.74), 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.