SPFFX vs. SSSYX

Last updated Jun 24, 2026

SPFFX (Sphere 500 Fossil Free Fund) and SSSYX (State Street Equity 500 Index Fund Class K) are both mutual funds - SPFFX is a Large Cap Blend Equities fund managed by Reflection Asset Management, while SSSYX is a S&P 500 fund tracking the S&P 500 Index. Over the past 3 years, SPFFX returned 21.91%/yr vs 21.36%/yr for SSSYX. With a 0.99 correlation, they move nearly in lockstep. SPFFX charges 0.11%/yr vs 0.02%/yr for SSSYX.

Performance

SPFFX vs. SSSYX - Performance Comparison

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

Returns By Period

The year-to-date returns for both stocks are quite close, with SPFFX having a 9.97% return and SSSYX slightly lower at 9.78%.

SPFFX

• 1D: -0.48%
• 1M: 0.33%
• YTD: 9.97%
• 6M: 8.89%
• 1Y: 25.99%
• 3Y*: 21.91%
• 5Y*: —
• 10Y*: —

SSSYX

• 1D: -0.36%
• 1M: 0.10%
• YTD: 9.78%
• 6M: 8.78%
• 1Y: 25.47%
• 3Y*: 21.36%
• 5Y*: 13.57%
• 10Y*: 45.70%

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

SPFFX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
SPFFX Sphere 500 Fossil Free Fund	9.97%	18.12%	25.13%	29.48%	-20.03%	9.04%
SSSYX State Street Equity 500 Index Fund Class K	9.78%	17.81%	24.99%	26.27%	-18.16%	11.15%

Correlation

The correlation between SPFFX and SSSYX is 0.99 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.99
Correlation (3Y) Calculated over the trailing 3-year period	0.99
Correlation (All Time) Calculated using the full available price history since Oct 5, 2021	0.99

The correlation between SPFFX and SSSYX has been stable across timeframes, ranging from 0.99 to 0.99 - a consistent structural relationship.

Return for Risk

SPFFX vs. SSSYX — Risk / Return Rank

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

SPFFX

SPFFX Risk / Return Rank: 51
SPFFX Sharpe Ratio Rank: 52
SPFFX Sortino Ratio Rank: 47
SPFFX Omega Ratio Rank: 50
SPFFX Calmar Ratio Rank: 49
SPFFX Martin Ratio Rank: 57

SSSYX

SSSYX Risk / Return Rank: 65
SSSYX Sharpe Ratio Rank: 63
SSSYX Sortino Ratio Rank: 57
SSSYX Omega Ratio Rank: 59
SSSYX Calmar Ratio Rank: 68
SSSYX Martin Ratio Rank: 78

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. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Sphere 500 Fossil Free Fund (SPFFX) and State Street Equity 500 Index Fund Class K (SSSYX). 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.

	SPFFX	SSSYX	Difference
Sharpe ratio: Return per unit of total volatility	1.98	2.15	-0.17
Sortino ratio: Return per unit of downside risk	2.66	2.91	-0.24
Omega ratio: Gain probability vs. loss probability	1.35	1.39	-0.04
Calmar ratio: Return relative to maximum drawdown	2.56	3.02	-0.46
Martin ratio: Return relative to average drawdown	10.82	13.62	-2.80

SPFFX vs. SSSYX - Sharpe Ratio Comparison

The current SPFFX Sharpe Ratio is 1.98, which is comparable to the SSSYX Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of SPFFX and SSSYX, 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

SPFFX vs. SSSYX - Drawdown Comparison

The maximum SPFFX drawdown since its inception was -25.11%, smaller than the maximum SSSYX drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for SPFFX and SSSYX.

Drawdown Indicators

	SPFFX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-25.11%	-33.77%	+8.66%
Max Drawdown (1Y) Largest decline over 1 year	-10.75%	-8.88%	-1.87%
Max Drawdown (3Y) Largest decline over 3 years	-19.97%	-18.74%	-1.23%
Max Drawdown (5Y) Largest decline over 5 years	—	-24.49%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-33.77%	—
Current Drawdown Current decline from peak	-1.97%	-1.72%	-0.25%
Average Drawdown Average peak-to-trough decline	-6.35%	-3.91%	-2.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.54%	1.96%	+0.58%

Volatility

SPFFX vs. SSSYX - Volatility Comparison

Sphere 500 Fossil Free Fund (SPFFX) has a higher volatility of 5.35% compared to State Street Equity 500 Index Fund Class K (SSSYX) at 4.67%. This indicates that SPFFX's price experiences larger fluctuations and is considered to be riskier than SSSYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPFFX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.35%	4.67%	+0.68%
Volatility (6M) Calculated over the trailing 6-month period	11.15%	9.83%	+1.32%
Volatility (1Y) Calculated over the trailing 1-year period	13.95%	12.49%	+1.46%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.23%	16.98%	+0.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.23%	121.18%	-103.95%

SPFFX vs. SSSYX - Expense Ratio Comparison

SPFFX has a 0.11% expense ratio, which is higher than SSSYX's 0.02% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

SPFFX vs. SSSYX - Dividend Comparison

SPFFX's dividend yield for the trailing twelve months is around 6.18%, more than SSSYX's 1.31% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPFFX Sphere 500 Fossil Free Fund	6.18%	6.80%	1.06%	1.32%	0.73%	0.14%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
SSSYX State Street Equity 500 Index Fund Class K	1.31%	1.44%	1.63%	1.78%	2.16%	2.76%	1.86%	4.44%	5.18%	5.94%	2.07%	1.84%

Frequently Asked Questions

Can I hold both SPFFX and SSSYX in my portfolio?

With a correlation of 0.99, SPFFX and SSSYX 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, SPFFX or SSSYX?

SPFFX has higher volatility (5.35%) compared to SSSYX (4.67%). In terms of maximum drawdown, SPFFX dropped -25.11% vs SSSYX's -33.77%.

Which has better risk-adjusted returns?

SSSYX currently has the higher Sharpe Ratio (2.15 vs 1.98), 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.