SPFFX vs. PRBLX

Last updated Apr 1, 2026

Compare and contrast key facts about Sphere 500 Fossil Free Fund (SPFFX) and Parnassus Core Equity Fund (PRBLX).

SPFFX is managed by Reflection Asset Management. It was launched on Oct 3, 2021. PRBLX is managed by Parnassus. It was launched on Aug 31, 1992.

Performance

SPFFX vs. PRBLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Sphere 500 Fossil Free Fund (SPFFX) and Parnassus Core Equity Fund (PRBLX). The values are adjusted to include any dividend payments, if applicable.

SPFFX vs. PRBLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
SPFFX Sphere 500 Fossil Free Fund	-9.28%	18.12%	25.13%	29.48%	-20.03%	9.04%
PRBLX Parnassus Core Equity Fund	-8.62%	11.67%	18.58%	24.97%	-18.64%	10.27%

Returns By Period

In the year-to-date period, SPFFX achieves a -9.28% return, which is significantly lower than PRBLX's -8.62% return.

SPFFX

• 1D: -0.33%
• 1M: -8.34%
• YTD: -9.28%
• 6M: -7.06%
• 1Y: 13.01%
• 3Y*: 17.09%
• 5Y*: —
• 10Y*: —

PRBLX

• 1D: 0.02%
• 1M: -8.59%
• YTD: -8.62%
• 6M: -7.14%
• 1Y: 4.60%
• 3Y*: 12.03%
• 5Y*: 7.94%
• 10Y*: 11.97%

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

SPFFX vs. PRBLX - Expense Ratio Comparison

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

PRBLX

Parnassus Core Equity Fund

SPFFX

Sphere 500 Fossil Free Fund

Return for Risk

SPFFX vs. PRBLX — Risk / Return Rank

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

SPFFX

SPFFX Risk / Return Rank: 34
SPFFX Sharpe Ratio Rank: 32
SPFFX Sortino Ratio Rank: 34
SPFFX Omega Ratio Rank: 36
SPFFX Calmar Ratio Rank: 33
SPFFX Martin Ratio Rank: 37

PRBLX

PRBLX Risk / Return Rank: 12
PRBLX Sharpe Ratio Rank: 13
PRBLX Sortino Ratio Rank: 13
PRBLX Omega Ratio Rank: 13
PRBLX Calmar Ratio Rank: 11
PRBLX Martin Ratio Rank: 11

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.

SPFFX vs. PRBLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Sphere 500 Fossil Free Fund (SPFFX) 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.

	SPFFX	PRBLX	Difference
Sharpe ratio Return per unit of total volatility	0.71	0.30	+0.41
Sortino ratio Return per unit of downside risk	1.14	0.55	+0.58
Omega ratio Gain probability vs. loss probability	1.17	1.08	+0.09
Calmar ratio Return relative to maximum drawdown	0.91	0.24	+0.68
Martin ratio Return relative to average drawdown	3.88	0.86	+3.01
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SPFFX vs. PRBLX - Sharpe Ratio Comparison

The current SPFFX Sharpe Ratio is 0.71, which is higher than the PRBLX Sharpe Ratio of 0.30. The chart below compares the historical Sharpe Ratios of SPFFX and PRBLX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	SPFFX	PRBLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.71	0.30	+0.41
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.49	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.70	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.57	0.69	-0.12

Correlation

The correlation between SPFFX and PRBLX is 0.95, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

SPFFX vs. PRBLX - Dividend Comparison

SPFFX's dividend yield for the trailing twelve months is around 7.50%, less than PRBLX's 20.83% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPFFX Sphere 500 Fossil Free Fund	7.50%	6.80%	1.06%	1.32%	0.73%	0.14%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
PRBLX Parnassus Core Equity Fund	20.83%	19.08%	10.00%	6.01%	10.13%	7.77%	5.87%	8.02%	9.64%	7.16%	3.80%	9.62%

Drawdowns

SPFFX vs. PRBLX - Drawdown Comparison

The maximum SPFFX drawdown since its inception was -25.11%, smaller than the maximum PRBLX drawdown of -42.20%. Use the drawdown chart below to compare losses from any high point for SPFFX and PRBLX.

Drawdown Indicators

	SPFFX	PRBLX	Difference
Max Drawdown Largest peak-to-trough decline	-25.11%	-42.20%	+17.09%
Max Drawdown (1Y) Largest decline over 1 year	-12.14%	-11.63%	-0.51%
Max Drawdown (5Y) Largest decline over 5 years	—	-26.31%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-30.09%	—
Current Drawdown Current decline from peak	-10.75%	-11.61%	+0.86%
Average Drawdown Average peak-to-trough decline	-6.60%	-4.06%	-2.54%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.86%	3.17%	-0.31%

Volatility

SPFFX vs. PRBLX - Volatility Comparison

Sphere 500 Fossil Free Fund (SPFFX) has a higher volatility of 4.70% compared to Parnassus Core Equity Fund (PRBLX) at 4.09%. This indicates that SPFFX'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

	SPFFX	PRBLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.70%	4.09%	+0.61%
Volatility (6M) Calculated over the trailing 6-month period	10.07%	8.57%	+1.50%
Volatility (1Y) Calculated over the trailing 1-year period	19.14%	16.68%	+2.46%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.24%	16.19%	+1.05%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.24%	17.22%	+0.02%