FIDJX vs. RCKSX

Last updated Jun 4, 2026

FIDJX (Fidelity SAI Sustainable Sector Fund) and RCKSX (Rock Oak Core Growth Fund) are both Large Cap Blend Equities funds. Over the past 3 years, FIDJX returned 24.19%/yr vs 19.62%/yr for RCKSX. A 0.77 correlation means they provide meaningful diversification when combined. FIDJX charges 0.44%/yr vs 1.25%/yr for RCKSX.

Performance

FIDJX vs. RCKSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity SAI Sustainable Sector Fund (FIDJX) and Rock Oak Core Growth Fund (RCKSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FIDJX achieves a 16.07% return, which is significantly higher than RCKSX's 14.10% return.

FIDJX

• 1D: 0.38%
• 1M: 6.01%
• YTD: 16.07%
• 6M: 16.22%
• 1Y: 35.75%
• 3Y*: 24.19%
• 5Y*: —
• 10Y*: —

RCKSX

• 1D: -0.13%
• 1M: 1.87%
• YTD: 14.10%
• 6M: 14.42%
• 1Y: 20.18%
• 3Y*: 19.62%
• 5Y*: 7.42%
• 10Y*: 10.85%

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

FIDJX vs. RCKSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
FIDJX Fidelity SAI Sustainable Sector Fund	16.07%	17.55%	23.85%	31.66%	-10.52%
RCKSX Rock Oak Core Growth Fund	14.10%	12.99%	15.12%	15.57%	-10.66%

Correlation

The correlation between FIDJX and RCKSX 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	0.69
Correlation (All Time) Calculated using the full available price history since Apr 26, 2022	0.77

The correlation between FIDJX and RCKSX shifts across timeframes, from 0.60 (1 year) to 0.77 (all time), reflecting how their relationship changes across market environments.

Return for Risk

FIDJX vs. RCKSX — Risk / Return Rank

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

FIDJX

FIDJX Risk / Return Rank: 86
FIDJX Sharpe Ratio Rank: 88
FIDJX Sortino Ratio Rank: 82
FIDJX Omega Ratio Rank: 78
FIDJX Calmar Ratio Rank: 87
FIDJX Martin Ratio Rank: 94

RCKSX

RCKSX Risk / Return Rank: 56
RCKSX Sharpe Ratio Rank: 39
RCKSX Sortino Ratio Rank: 40
RCKSX Omega Ratio Rank: 34
RCKSX Calmar Ratio Rank: 93
RCKSX 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.

FIDJX vs. RCKSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI Sustainable Sector Fund (FIDJX) and Rock Oak Core Growth Fund (RCKSX). 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.

	FIDJX	RCKSX	Difference
Sharpe ratio: Return per unit of total volatility	2.88	1.83	+1.05
Sortino ratio: Return per unit of downside risk	3.86	2.66	+1.21
Omega ratio: Gain probability vs. loss probability	1.51	1.31	+0.21
Calmar ratio: Return relative to maximum drawdown	4.27	5.11	-0.83
Martin ratio: Return relative to average drawdown	20.60	14.18	+6.41
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FIDJX vs. RCKSX - Sharpe Ratio Comparison

The current FIDJX Sharpe Ratio is 2.88, which is higher than the RCKSX Sharpe Ratio of 1.83. The chart below compares the historical Sharpe Ratios of FIDJX and RCKSX, 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

	FIDJX	RCKSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.88	1.83	+1.05
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.48	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.62	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.01	0.38	+0.64

Drawdowns

FIDJX vs. RCKSX - Drawdown Comparison

The maximum FIDJX drawdown since its inception was -20.43%, smaller than the maximum RCKSX drawdown of -57.88%. Use the drawdown chart below to compare losses from any high point for FIDJX and RCKSX.

Drawdown Indicators

	FIDJX	RCKSX	Difference
Max Drawdown Largest peak-to-trough decline	-20.43%	-57.88%	+37.45%
Max Drawdown (1Y) Largest decline over 1 year	-8.63%	-4.14%	-4.49%
Max Drawdown (3Y) Largest decline over 3 years	-20.43%	-18.22%	-2.21%
Max Drawdown (5Y) Largest decline over 5 years	—	-22.54%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-33.10%	—
Current Drawdown Current decline from peak	0.00%	-0.60%	+0.60%
Average Drawdown Average peak-to-trough decline	-3.55%	-9.51%	+5.96%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.78%	1.49%	+0.29%

Volatility

FIDJX vs. RCKSX - Volatility Comparison

Fidelity SAI Sustainable Sector Fund (FIDJX) has a higher volatility of 3.44% compared to Rock Oak Core Growth Fund (RCKSX) at 2.94%. This indicates that FIDJX's price experiences larger fluctuations and is considered to be riskier than RCKSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FIDJX	RCKSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.44%	2.94%	+0.50%
Volatility (6M) Calculated over the trailing 6-month period	9.90%	8.06%	+1.84%
Volatility (1Y) Calculated over the trailing 1-year period	12.82%	11.56%	+1.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.15%	15.66%	+2.49%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.15%	17.55%	+0.60%

FIDJX vs. RCKSX - Expense Ratio Comparison

FIDJX has a 0.44% expense ratio, which is lower than RCKSX's 1.25% expense ratio.

Dividends

FIDJX vs. RCKSX - Dividend Comparison

FIDJX's dividend yield for the trailing twelve months is around 0.52%, less than RCKSX's 5.48% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FIDJX Fidelity SAI Sustainable Sector Fund	0.52%	0.60%	1.74%	0.52%	0.44%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
RCKSX Rock Oak Core Growth Fund	5.48%	6.26%	0.47%	0.71%	1.00%	4.31%	16.56%	3.18%	0.59%	5.91%	0.70%	3.21%

Frequently Asked Questions

Can I hold both FIDJX and RCKSX in my portfolio?

FIDJX and RCKSX 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, FIDJX or RCKSX?

FIDJX has higher volatility (3.44%) compared to RCKSX (2.94%). In terms of maximum drawdown, FIDJX dropped -20.43% vs RCKSX's -57.88%.

Which has better risk-adjusted returns?

FIDJX currently has the higher Sharpe Ratio (2.88 vs 1.83), 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.