DFSIX vs. SPFFX

Last updated Jun 3, 2026

DFSIX (DFA U.S. Sustainability Core 1 Portfolio) and SPFFX (Sphere 500 Fossil Free Fund) are both Large Cap Blend Equities funds. Over the past 3 years, DFSIX returned 20.57%/yr vs 23.39%/yr for SPFFX. With a 0.96 correlation, they move nearly in lockstep. DFSIX charges 0.18%/yr vs 0.11%/yr for SPFFX.

Performance

DFSIX vs. SPFFX - Performance Comparison

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

Returns By Period

In the year-to-date period, DFSIX achieves a 7.46% return, which is significantly lower than SPFFX's 11.99% return.

DFSIX

• 1D: 0.09%
• 1M: 3.54%
• YTD: 7.46%
• 6M: 8.13%
• 1Y: 25.10%
• 3Y*: 20.57%
• 5Y*: 12.01%
• 10Y*: 14.88%

SPFFX

• 1D: 0.36%
• 1M: 6.47%
• YTD: 11.99%
• 6M: 12.32%
• 1Y: 30.33%
• 3Y*: 23.39%
• 5Y*: —
• 10Y*: —

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

DFSIX vs. SPFFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
DFSIX DFA U.S. Sustainability Core 1 Portfolio	7.46%	15.92%	23.19%	25.70%	-17.85%	8.63%
SPFFX Sphere 500 Fossil Free Fund	11.99%	18.12%	25.13%	29.48%	-20.03%	9.04%

Correlation

The correlation between DFSIX and SPFFX 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	0.94
Correlation (All Time) Calculated using the full available price history since Oct 6, 2021	0.96

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

Return for Risk

DFSIX vs. SPFFX — Risk / Return Rank

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

DFSIX

DFSIX Risk / Return Rank: 45
DFSIX Sharpe Ratio Rank: 47
DFSIX Sortino Ratio Rank: 46
DFSIX Omega Ratio Rank: 44
DFSIX Calmar Ratio Rank: 39
DFSIX Martin Ratio Rank: 50

SPFFX

SPFFX Risk / Return Rank: 59
SPFFX Sharpe Ratio Rank: 64
SPFFX Sortino Ratio Rank: 56
SPFFX Omega Ratio Rank: 57
SPFFX Calmar Ratio Rank: 56
SPFFX Martin Ratio Rank: 63

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.

DFSIX vs. SPFFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for DFA U.S. Sustainability Core 1 Portfolio (DFSIX) and Sphere 500 Fossil Free Fund (SPFFX). 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.

	DFSIX	SPFFX	Difference
Sharpe ratio Return per unit of total volatility	2.03	2.36	-0.33
Sortino ratio Return per unit of downside risk	2.87	3.17	-0.30
Omega ratio Gain probability vs. loss probability	1.36	1.42	-0.06
Calmar ratio Return relative to maximum drawdown	2.40	2.87	-0.47
Martin ratio Return relative to average drawdown	10.45	12.52	-2.07
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

DFSIX vs. SPFFX - Sharpe Ratio Comparison

The current DFSIX Sharpe Ratio is 2.03, which is comparable to the SPFFX Sharpe Ratio of 2.36. The chart below compares the historical Sharpe Ratios of DFSIX and SPFFX, 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

	DFSIX	SPFFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.03	2.36	-0.33
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.69	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.82	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.58	0.84	-0.26

Drawdowns

DFSIX vs. SPFFX - Drawdown Comparison

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

Drawdown Indicators

	DFSIX	SPFFX	Difference
Max Drawdown Largest peak-to-trough decline	-53.77%	-25.11%	-28.66%
Max Drawdown (1Y) Largest decline over 1 year	-10.36%	-10.75%	+0.39%
Max Drawdown (3Y) Largest decline over 3 years	-20.13%	-19.97%	-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	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-6.89%	-6.41%	-0.48%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.38%	2.47%	-0.09%

Volatility

DFSIX vs. SPFFX - Volatility Comparison

The current volatility for DFA U.S. Sustainability Core 1 Portfolio (DFSIX) is 3.10%, while Sphere 500 Fossil Free Fund (SPFFX) has a volatility of 3.27%. This indicates that DFSIX experiences smaller price fluctuations and is considered to be less risky than SPFFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	DFSIX	SPFFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.10%	3.27%	-0.17%
Volatility (6M) Calculated over the trailing 6-month period	9.74%	10.13%	-0.39%
Volatility (1Y) Calculated over the trailing 1-year period	12.70%	13.21%	-0.51%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.57%	17.18%	+0.39%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.28%	17.18%	+1.10%

DFSIX vs. SPFFX - Expense Ratio Comparison

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

DFSIX vs. SPFFX - Dividend Comparison

DFSIX's dividend yield for the trailing twelve months is around 0.83%, less than SPFFX's 6.07% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
DFSIX DFA U.S. Sustainability Core 1 Portfolio	0.83%	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	6.07%	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 DFSIX and SPFFX in my portfolio?

With a correlation of 0.92, DFSIX and SPFFX 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, DFSIX or SPFFX?

SPFFX has higher volatility (3.27%) compared to DFSIX (3.10%). In terms of maximum drawdown, DFSIX dropped -53.77% vs SPFFX's -25.11%.

Which has better risk-adjusted returns?

SPFFX currently has the higher Sharpe Ratio (2.36 vs 2.03), 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.