MSTU vs. FXAIX

Last updated Aug 4, 2026

MSTU (T-Rex 2X Long MSTR Daily Target ETF) and FXAIX (Fidelity 500 Index Fund) are both funds - MSTU is a Leveraged Equities fund actively managed by T-Rex, while FXAIX is a S&P 500 fund tracking the S&P 500 Index. MSTU is actively managed, while FXAIX is passively managed. Over the past year, MSTU returned -97.30% vs 21.49% for FXAIX. Their 0.45 correlation means their historical movements had little consistent relationship. MSTU charges 1.05%/yr vs 0.02%/yr for FXAIX.

Performance

MSTU vs. FXAIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T-Rex 2X Long MSTR Daily Target ETF (MSTU) and Fidelity 500 Index Fund (FXAIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MSTU achieves a -78.22% return, which is significantly lower than FXAIX's 10.13% return.

MSTU

• 1D: 2.84%
• 1M: -15.81%
• 6M: -72.32%
• YTD: -78.22%
• 1Y: -97.30%
• 3Y*: —
• 5Y*: —
• 10Y*: —
• ALL TIME*: -75.33%

FXAIX

• 1D: 0.71%
• 1M: 0.15%
• 6M: 7.97%
• YTD: 10.13%
• 1Y: 21.49%
• 3Y*: 19.42%
• 5Y*: 12.84%
• 10Y*: 15.16%
• ALL TIME*: 13.94%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
FXAIX Fidelity 500 Index Fund	$0.00	$0.00	$0.00
MSTU T-Rex 2X Long MSTR Daily Target ETF	$200.96M	$178.85M	$198.52M

MSTU vs. FXAIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024
MSTU T-Rex 2X Long MSTR Daily Target ETF	-78.22%	-89.07%	205.47%
FXAIX Fidelity 500 Index Fund	10.13%	17.84%	4.77%

Correlation

The correlation between MSTU and FXAIX is 0.49, which is low. Their historical price movements had little consistent relationship.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.49
Correlation (All Time) Calculated using the full available price history since Sep 18, 2024	0.45

Return for Risk

MSTU vs. FXAIX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

MSTU

MSTU Risk / Return Rank: 2
MSTU Sharpe Ratio Rank: 4
MSTU Sortino Ratio Rank: 0
MSTU Omega Ratio Rank: 0
MSTU Calmar Ratio Rank: 0
MSTU Martin Ratio Rank: 3

FXAIX

FXAIX Risk / Return Rank: 59
FXAIX Sharpe Ratio Rank: 56
FXAIX Sortino Ratio Rank: 52
FXAIX Omega Ratio Rank: 53
FXAIX Calmar Ratio Rank: 61
FXAIX Martin Ratio Rank: 74

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

MSTU vs. FXAIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T-Rex 2X Long MSTR Daily Target ETF (MSTU) and Fidelity 500 Index Fund (FXAIX). 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.

	MSTU	FXAIX	Difference
Sharpe ratio: Return per unit of total volatility	-0.66	1.53	-2.19
Sortino ratio: Return per unit of downside risk	-2.36	2.12	-4.48
Omega ratio: Gain probability vs. loss probability	0.76	1.27	-0.51
Calmar ratio: Return relative to maximum drawdown	-0.99	2.21	-3.20
Martin ratio: Return relative to average drawdown	-1.20	9.48	-10.68

MSTU vs. FXAIX - Sharpe Ratio Comparison

The current MSTU Sharpe Ratio is -0.66, which is lower than the FXAIX Sharpe Ratio of 1.53. The chart below compares the historical Sharpe Ratios of MSTU and FXAIX, 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

MSTU vs. FXAIX - Drawdown Comparison

The maximum MSTU drawdown since its inception was -99.43%, which is greater than FXAIX's maximum drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for MSTU and FXAIX.

Drawdown Indicators

	MSTU	FXAIX	Difference
Max Drawdown Largest peak-to-trough decline	-99.43%	-33.79%	-65.64%
Max Drawdown (1Y) Largest decline over 1 year	-98.15%	-8.89%	-89.26%
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	-99.29%	-1.41%	-97.88%
Average Drawdown Average peak-to-trough decline	-74.16%	-3.77%	-70.39%
Ulcer Index Depth and duration of drawdowns from previous peaks	80.83%	2.07%	+78.76%

Volatility

MSTU vs. FXAIX - Volatility Comparison

T-Rex 2X Long MSTR Daily Target ETF (MSTU) has a higher volatility of 32.84% compared to Fidelity 500 Index Fund (FXAIX) at 3.52%. This indicates that MSTU's price experiences larger fluctuations and is considered to be riskier than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MSTU	FXAIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	32.84%	3.52%	+29.32%
Volatility (6M) Calculated over the trailing 6-month period	119.27%	10.11%	+109.16%
Volatility (1Y) Calculated over the trailing 1-year period	147.80%	12.87%	+134.93%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	168.37%	17.02%	+151.35%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	168.37%	18.07%	+150.30%

MSTU vs. FXAIX - Expense Ratio Comparison

MSTU has a 1.05% expense ratio, which is higher than FXAIX's 0.02% expense ratio.

Dividends

MSTU vs. FXAIX - Dividend Comparison

MSTU has not paid dividends to shareholders, while FXAIX's dividend yield for the trailing twelve months is around 1.06%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FXAIX Fidelity 500 Index Fund	1.06%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%
MSTU T-Rex 2X Long MSTR Daily Target ETF	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MSTU and FXAIX in my portfolio?

MSTU and FXAIX have a correlation of 0.49, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MSTU or FXAIX?

MSTU has higher volatility (32.84%) compared to FXAIX (3.52%). In terms of maximum drawdown, MSTU dropped -99.43% vs FXAIX's -33.79%.

Which has better risk-adjusted returns?

FXAIX currently has the higher Sharpe Ratio (1.53 vs -0.66), 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.