FXAIX vs. SPAX

Last updated Jun 4, 2026

FXAIX (Fidelity 500 Index Fund) and SPAX (Robinson Alternative Yield Pre-merger SPAC ETF) are both funds - FXAIX is a S&P 500 fund tracking the S&P 500 Index, while SPAX is a Event Driven fund actively managed by Toroso Investments. FXAIX is passively managed, while SPAX is actively managed. At a 0.03 correlation, their price movements are largely independent. FXAIX charges 0.02%/yr vs 0.85%/yr for SPAX.

Performance

FXAIX vs. SPAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity 500 Index Fund (FXAIX) and Robinson Alternative Yield Pre-merger SPAC ETF (SPAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

FXAIX

• 1D: 0.13%
• 1M: 5.80%
• YTD: 11.71%
• 6M: 11.74%
• 1Y: 28.99%
• 3Y*: 22.75%
• 5Y*: 14.28%
• 10Y*: 15.66%

SPAX

• 1D: —
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

FXAIX vs. SPAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
FXAIX Fidelity 500 Index Fund	11.71%	17.84%	25.01%	26.29%	-18.14%	13.16%
SPAX Robinson Alternative Yield Pre-merger SPAC ETF	0.00%	0.02%	5.11%	6.63%	1.25%	2.19%

Correlation

The correlation between FXAIX and SPAX is 0.03, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (3Y) Calculated over the trailing 3-year period	0.06
Correlation (All Time) Calculated using the full available price history since Jun 24, 2021	0.03

Return for Risk

FXAIX vs. SPAX — Risk / Return Rank

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

FXAIX

FXAIX Risk / Return Rank: 73
FXAIX Sharpe Ratio Rank: 76
FXAIX Sortino Ratio Rank: 67
FXAIX Omega Ratio Rank: 67
FXAIX Calmar Ratio Rank: 74
FXAIX Martin Ratio Rank: 83

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.

FXAIX vs. SPAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity 500 Index Fund (FXAIX) and Robinson Alternative Yield Pre-merger SPAC ETF (SPAX). 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.

	FXAIX	SPAX	Difference
Sharpe ratio Return per unit of total volatility	2.52	—	—
Sortino ratio Return per unit of downside risk	3.42	—	—
Omega ratio Gain probability vs. loss probability	1.46	—	—
Calmar ratio Return relative to maximum drawdown	3.36	—	—
Martin ratio Return relative to average drawdown	15.70	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	FXAIX	SPAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.52	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.85	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.87	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.82	—	—

Drawdowns

Drawdown Indicators

	FXAIX	SPAX	Difference
Max Drawdown Largest peak-to-trough decline	-33.79%	—	—
Max Drawdown (1Y) Largest decline over 1 year	-8.89%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-24.50%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-33.79%	—	—
Current Drawdown Current decline from peak	0.00%	—	—
Average Drawdown Average peak-to-trough decline	-3.79%	—	—
Ulcer Index Depth and duration of drawdowns from previous peaks	1.90%	—	—

Volatility

Volatility by Period

	FXAIX	SPAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.83%	—	—
Volatility (6M) Calculated over the trailing 6-month period	8.97%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	11.86%	—	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.91%	—	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.07%	—	—

FXAIX vs. SPAX - Expense Ratio Comparison

FXAIX has a 0.02% expense ratio, which is lower than SPAX's 0.85% expense ratio.

Dividends

FXAIX vs. SPAX - Dividend Comparison

FXAIX's dividend yield for the trailing twelve months is around 1.03%, while SPAX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FXAIX Fidelity 500 Index Fund	1.03%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%
SPAX Robinson Alternative Yield Pre-merger SPAC ETF	0.00%	0.00%	5.50%	7.54%	0.97%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FXAIX and SPAX in my portfolio?

FXAIX and SPAX have a correlation of 0.03, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.