FITLX vs. PRBLX

Last updated Jun 4, 2026

FITLX (Fidelity US Sustainability Index Fund) and PRBLX (Parnassus Core Equity Fund) are both Large Cap Blend Equities funds. Over the past 5 years, FITLX returned 14.20%/yr vs 10.33%/yr for PRBLX. With a 0.95 correlation, they move nearly in lockstep. FITLX charges 0.11%/yr vs 0.82%/yr for PRBLX.

Performance

FITLX vs. PRBLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity US Sustainability Index Fund (FITLX) and Parnassus Core Equity Fund (PRBLX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FITLX achieves a 10.47% return, which is significantly higher than PRBLX's 6.73% return.

FITLX

• 1D: -0.44%
• 1M: 5.58%
• YTD: 10.47%
• 6M: 11.11%
• 1Y: 28.82%
• 3Y*: 22.72%
• 5Y*: 14.20%
• 10Y*: —

PRBLX

• 1D: 0.10%
• 1M: 4.10%
• YTD: 6.73%
• 6M: 5.90%
• 1Y: 15.02%
• 3Y*: 16.56%
• 5Y*: 10.33%
• 10Y*: 13.62%

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

FITLX vs. PRBLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FITLX Fidelity US Sustainability Index Fund	10.47%	18.77%	23.59%	29.04%	-20.28%	31.55%	18.69%	31.54%	-3.32%	13.07%
PRBLX Parnassus Core Equity Fund	6.73%	11.67%	18.58%	24.97%	-18.64%	27.59%	21.21%	30.68%	-0.30%	10.20%

Correlation

The correlation between FITLX and PRBLX is 0.91, 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	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.94
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (All Time) Calculated using the full available price history since May 10, 2017	0.95

The correlation between FITLX and PRBLX has been stable across timeframes, ranging from 0.91 to 0.96 - a consistent structural relationship.

Return for Risk

FITLX vs. PRBLX — Risk / Return Rank

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

FITLX

FITLX Risk / Return Rank: 57
FITLX Sharpe Ratio Rank: 63
FITLX Sortino Ratio Rank: 59
FITLX Omega Ratio Rank: 57
FITLX Calmar Ratio Rank: 49
FITLX Martin Ratio Rank: 58

PRBLX

PRBLX Risk / Return Rank: 20
PRBLX Sharpe Ratio Rank: 23
PRBLX Sortino Ratio Rank: 22
PRBLX Omega Ratio Rank: 21
PRBLX Calmar Ratio Rank: 15
PRBLX Martin Ratio Rank: 20

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.

FITLX vs. PRBLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity US Sustainability Index Fund (FITLX) and Parnassus Core Equity Fund (PRBLX). 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.

	FITLX	PRBLX	Difference
Sharpe ratio: Return per unit of total volatility	2.33	1.36	+0.98
Sortino ratio: Return per unit of downside risk	3.23	1.94	+1.29
Omega ratio: Gain probability vs. loss probability	1.42	1.24	+0.18
Calmar ratio: Return relative to maximum drawdown	2.67	1.37	+1.30
Martin ratio: Return relative to average drawdown	11.60	5.35	+6.25
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FITLX vs. PRBLX - Sharpe Ratio Comparison

The current FITLX Sharpe Ratio is 2.33, which is higher than the PRBLX Sharpe Ratio of 1.36. The chart below compares the historical Sharpe Ratios of FITLX and PRBLX, 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

	FITLX	PRBLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.33	1.36	+0.98
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.81	0.64	+0.17
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.79	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.82	0.71	+0.11

Drawdowns

FITLX vs. PRBLX - Drawdown Comparison

The maximum FITLX drawdown since its inception was -34.35%, smaller than the maximum PRBLX drawdown of -42.20%. Use the drawdown chart below to compare losses from any high point for FITLX and PRBLX.

Drawdown Indicators

	FITLX	PRBLX	Difference
Max Drawdown Largest peak-to-trough decline	-34.35%	-42.20%	+7.85%
Max Drawdown (1Y) Largest decline over 1 year	-11.15%	-11.63%	+0.48%
Max Drawdown (3Y) Largest decline over 3 years	-19.99%	-16.31%	-3.68%
Max Drawdown (5Y) Largest decline over 5 years	-26.91%	-26.31%	-0.60%
Max Drawdown (10Y) Largest decline over 10 years	—	-30.09%	—
Current Drawdown Current decline from peak	-0.44%	0.00%	-0.44%
Average Drawdown Average peak-to-trough decline	-5.07%	-4.05%	-1.02%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.56%	2.97%	-0.41%

Volatility

FITLX vs. PRBLX - Volatility Comparison

Fidelity US Sustainability Index Fund (FITLX) has a higher volatility of 3.56% compared to Parnassus Core Equity Fund (PRBLX) at 3.03%. This indicates that FITLX's price experiences larger fluctuations and is considered to be riskier than PRBLX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FITLX	PRBLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.56%	3.03%	+0.53%
Volatility (6M) Calculated over the trailing 6-month period	9.77%	9.12%	+0.65%
Volatility (1Y) Calculated over the trailing 1-year period	12.76%	11.78%	+0.98%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.58%	16.25%	+1.33%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.10%	17.27%	+1.83%

FITLX vs. PRBLX - Expense Ratio Comparison

FITLX has a 0.11% expense ratio, which is lower than PRBLX's 0.82% expense ratio.

Dividends

FITLX vs. PRBLX - Dividend Comparison

FITLX's dividend yield for the trailing twelve months is around 1.00%, less than PRBLX's 17.83% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FITLX Fidelity US Sustainability Index Fund	1.00%	1.11%	1.29%	1.12%	1.49%	0.99%	1.01%	1.41%	1.58%	0.76%	0.00%	0.00%
PRBLX Parnassus Core Equity Fund	17.83%	19.08%	10.00%	6.01%	10.13%	7.77%	5.87%	8.02%	9.64%	7.16%	3.80%	9.62%

Frequently Asked Questions

Can I hold both FITLX and PRBLX in my portfolio?

With a correlation of 0.91, FITLX and PRBLX 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, FITLX or PRBLX?

FITLX has higher volatility (3.56%) compared to PRBLX (3.03%). In terms of maximum drawdown, FITLX dropped -34.35% vs PRBLX's -42.20%.

Which has better risk-adjusted returns?

FITLX currently has the higher Sharpe Ratio (2.33 vs 1.36), 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.