FIDEX vs. TANDX

Last updated Jun 24, 2026

FIDEX (Fidelity SAI Sustainable U.S. Equity Fund) and TANDX (Castle Tandem Fund) are both Large Cap Blend Equities funds. Over the past 3 years, FIDEX returned 20.73%/yr vs 0.56%/yr for TANDX. A 0.65 correlation means they provide meaningful diversification when combined. FIDEX charges 0.56%/yr vs 1.59%/yr for TANDX.

Performance

FIDEX vs. TANDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity SAI Sustainable U.S. Equity Fund (FIDEX) and Castle Tandem Fund (TANDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FIDEX achieves a 14.33% return, which is significantly higher than TANDX's -13.98% return.

FIDEX

• 1D: 0.12%
• 1M: 3.19%
• YTD: 14.33%
• 6M: 13.41%
• 1Y: 31.27%
• 3Y*: 20.73%
• 5Y*: —
• 10Y*: —

TANDX

• 1D: -0.79%
• 1M: -2.77%
• YTD: -13.98%
• 6M: -14.52%
• 1Y: -15.47%
• 3Y*: 0.56%
• 5Y*: 1.33%
• 10Y*: —

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

FIDEX vs. TANDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
FIDEX Fidelity SAI Sustainable U.S. Equity Fund	14.33%	15.80%	21.44%	24.99%	-8.88%
TANDX Castle Tandem Fund	-13.98%	3.67%	7.66%	8.42%	-0.89%

Correlation

The correlation between FIDEX and TANDX is 0.36, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.36
Correlation (3Y) Calculated over the trailing 3-year period	0.52
Correlation (All Time) Calculated using the full available price history since Apr 25, 2022	0.65

Over the past year, the correlation between FIDEX and TANDX has dropped to 0.36 - well below their long-term average of 0.65, suggesting their price drivers have been diverging.

Return for Risk

FIDEX vs. TANDX — Risk / Return Rank

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

FIDEX

FIDEX Risk / Return Rank: 72
FIDEX Sharpe Ratio Rank: 71
FIDEX Sortino Ratio Rank: 65
FIDEX Omega Ratio Rank: 63
FIDEX Calmar Ratio Rank: 75
FIDEX Martin Ratio Rank: 86

TANDX

TANDX Risk / Return Rank: 0
TANDX Sharpe Ratio Rank: 0
TANDX Sortino Ratio Rank: 0
TANDX Omega Ratio Rank: 0
TANDX Calmar Ratio Rank: 0
TANDX Martin Ratio Rank: 0

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.

FIDEX vs. TANDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI Sustainable U.S. Equity Fund (FIDEX) and Castle Tandem Fund (TANDX). 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.

	FIDEX	TANDX	Difference
Sharpe ratio: Return per unit of total volatility	2.26	-1.54	+3.80
Sortino ratio: Return per unit of downside risk	3.07	-2.07	+5.15
Omega ratio: Gain probability vs. loss probability	1.40	0.77	+0.64
Calmar ratio: Return relative to maximum drawdown	3.24	-0.88	+4.11
Martin ratio: Return relative to average drawdown	15.25	-1.91	+17.17

FIDEX vs. TANDX - Sharpe Ratio Comparison

The current FIDEX Sharpe Ratio is 2.26, which is higher than the TANDX Sharpe Ratio of -1.54. The chart below compares the historical Sharpe Ratios of FIDEX and TANDX, 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

FIDEX vs. TANDX - Drawdown Comparison

The maximum FIDEX drawdown since its inception was -21.90%, smaller than the maximum TANDX drawdown of -93.98%. Use the drawdown chart below to compare losses from any high point for FIDEX and TANDX.

Drawdown Indicators

	FIDEX	TANDX	Difference
Max Drawdown Largest peak-to-trough decline	-21.90%	-93.98%	+72.08%
Max Drawdown (1Y) Largest decline over 1 year	-10.13%	-16.90%	+6.77%
Max Drawdown (3Y) Largest decline over 3 years	-21.90%	-93.98%	+72.08%
Max Drawdown (5Y) Largest decline over 5 years	—	-93.98%	—
Current Drawdown Current decline from peak	0.00%	-93.98%	+93.98%
Average Drawdown Average peak-to-trough decline	-3.67%	-20.77%	+17.10%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.14%	7.72%	-5.58%

Volatility

FIDEX vs. TANDX - Volatility Comparison

Fidelity SAI Sustainable U.S. Equity Fund (FIDEX) has a higher volatility of 5.21% compared to Castle Tandem Fund (TANDX) at 3.23%. This indicates that FIDEX's price experiences larger fluctuations and is considered to be riskier than TANDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FIDEX	TANDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.21%	3.23%	+1.98%
Volatility (6M) Calculated over the trailing 6-month period	11.71%	7.55%	+4.16%
Volatility (1Y) Calculated over the trailing 1-year period	14.54%	9.62%	+4.92%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.50%	596.04%	-577.54%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.50%	494.77%	-476.27%

FIDEX vs. TANDX - Expense Ratio Comparison

FIDEX has a 0.56% expense ratio, which is lower than TANDX's 1.59% expense ratio.

Dividends

FIDEX vs. TANDX - Dividend Comparison

FIDEX's dividend yield for the trailing twelve months is around 1.37%, less than TANDX's 7.17% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
FIDEX Fidelity SAI Sustainable U.S. Equity Fund	1.37%	1.64%	1.87%	0.46%	0.63%	0.00%	0.00%	0.00%
TANDX Castle Tandem Fund	7.17%	6.17%	3.71%	2.10%	1.48%	4.57%	0.33%	0.37%

Frequently Asked Questions

Can I hold both FIDEX and TANDX in my portfolio?

FIDEX and TANDX have a correlation of 0.36, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FIDEX or TANDX?

FIDEX has higher volatility (5.21%) compared to TANDX (3.23%). In terms of maximum drawdown, FIDEX dropped -21.90% vs TANDX's -93.98%.

Which has better risk-adjusted returns?

FIDEX currently has the higher Sharpe Ratio (2.26 vs -1.54), 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.