SPFFX vs. DFSIX

Last updated Jun 24, 2026

SPFFX (Sphere 500 Fossil Free Fund) and DFSIX (DFA U.S. Sustainability Core 1 Portfolio) are both Large Cap Blend Equities funds. Over the past 3 years, SPFFX returned 21.91%/yr vs 19.56%/yr for DFSIX. With a 0.96 correlation, they move nearly in lockstep. SPFFX charges 0.11%/yr vs 0.18%/yr for DFSIX.

Performance

SPFFX vs. DFSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Sphere 500 Fossil Free Fund (SPFFX) and DFA U.S. Sustainability Core 1 Portfolio (DFSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SPFFX achieves a 9.97% return, which is significantly higher than DFSIX's 6.55% return.

SPFFX

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

DFSIX

• 1D: -0.43%
• 1M: 0.43%
• YTD: 6.55%
• 6M: 5.28%
• 1Y: 22.09%
• 3Y*: 19.56%
• 5Y*: 11.76%
• 10Y*: 15.19%

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

SPFFX vs. DFSIX - 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%
DFSIX DFA U.S. Sustainability Core 1 Portfolio	6.55%	15.92%	23.19%	25.70%	-17.85%	9.74%

Correlation

The correlation between SPFFX and DFSIX is 0.92, 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	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (All Time) Calculated using the full available price history since Oct 5, 2021	0.96

The correlation between SPFFX and DFSIX has been stable across timeframes, ranging from 0.92 to 0.96 - a consistent structural relationship.

Return for Risk

SPFFX vs. DFSIX — 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

DFSIX

DFSIX Risk / Return Rank: 44
DFSIX Sharpe Ratio Rank: 44
DFSIX Sortino Ratio Rank: 43
DFSIX Omega Ratio Rank: 41
DFSIX Calmar Ratio Rank: 40
DFSIX Martin Ratio Rank: 50

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. DFSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Sphere 500 Fossil Free Fund (SPFFX) and DFA U.S. Sustainability Core 1 Portfolio (DFSIX). 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	DFSIX	Difference
Sharpe ratio: Return per unit of total volatility	1.98	1.80	+0.18
Sortino ratio: Return per unit of downside risk	2.66	2.54	+0.12
Omega ratio: Gain probability vs. loss probability	1.35	1.32	+0.04
Calmar ratio: Return relative to maximum drawdown	2.56	2.27	+0.29
Martin ratio: Return relative to average drawdown	10.82	9.74	+1.08

SPFFX vs. DFSIX - Sharpe Ratio Comparison

The current SPFFX Sharpe Ratio is 1.98, which is comparable to the DFSIX Sharpe Ratio of 1.80. The chart below compares the historical Sharpe Ratios of SPFFX and DFSIX, 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. DFSIX - Drawdown Comparison

The maximum SPFFX drawdown since its inception was -25.11%, smaller than the maximum DFSIX drawdown of -53.77%. Use the drawdown chart below to compare losses from any high point for SPFFX and DFSIX.

Drawdown Indicators

	SPFFX	DFSIX	Difference
Max Drawdown Largest peak-to-trough decline	-25.11%	-53.77%	+28.66%
Max Drawdown (1Y) Largest decline over 1 year	-10.75%	-10.36%	-0.39%
Max Drawdown (3Y) Largest decline over 3 years	-19.97%	-20.13%	+0.16%
Max Drawdown (5Y) Largest decline over 5 years	—	-25.16%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-35.68%	—
Current Drawdown Current decline from peak	-1.97%	-1.24%	-0.73%
Average Drawdown Average peak-to-trough decline	-6.35%	-6.88%	+0.53%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.54%	2.40%	+0.14%

Volatility

SPFFX vs. DFSIX - Volatility Comparison

Sphere 500 Fossil Free Fund (SPFFX) has a higher volatility of 5.35% compared to DFA U.S. Sustainability Core 1 Portfolio (DFSIX) at 4.32%. This indicates that SPFFX's price experiences larger fluctuations and is considered to be riskier than DFSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPFFX	DFSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.35%	4.32%	+1.03%
Volatility (6M) Calculated over the trailing 6-month period	11.15%	10.35%	+0.80%
Volatility (1Y) Calculated over the trailing 1-year period	13.95%	13.11%	+0.84%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.23%	17.64%	-0.41%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.23%	18.31%	-1.08%

SPFFX vs. DFSIX - Expense Ratio Comparison

SPFFX has a 0.11% expense ratio, which is lower than DFSIX's 0.18% 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

SPFFX vs. DFSIX - Dividend Comparison

SPFFX's dividend yield for the trailing twelve months is around 6.18%, more than DFSIX's 0.84% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
DFSIX DFA U.S. Sustainability Core 1 Portfolio	0.84%	0.88%	0.99%	1.21%	1.35%	2.13%	1.19%	2.02%	2.31%	1.92%	1.85%	2.13%
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%

Frequently Asked Questions

Can I hold both SPFFX and DFSIX in my portfolio?

With a correlation of 0.92, SPFFX and DFSIX 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 DFSIX?

SPFFX has higher volatility (5.35%) compared to DFSIX (4.32%). In terms of maximum drawdown, SPFFX dropped -25.11% vs DFSIX's -53.77%.

Which has better risk-adjusted returns?

SPFFX currently has the higher Sharpe Ratio (1.98 vs 1.80), 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.