MMKT vs. SPAXX

Last updated Jun 4, 2026

MMKT (Texas Capital Government Money Market ETF) and SPAXX (Fidelity Government Money Market Fund) are both Money Market funds. Both are actively managed. Over the past year, MMKT returned 3.81% vs 3.66% for SPAXX. At a 0.19 correlation, their price movements are largely independent. MMKT charges 0.20%/yr vs 0.42%/yr for SPAXX.

Performance

MMKT vs. SPAXX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Texas Capital Government Money Market ETF (MMKT) and Fidelity Government Money Market Fund (SPAXX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with MMKT having a 1.44% return and SPAXX slightly lower at 1.37%.

MMKT

• 1D: 0.01%
• 1M: 0.28%
• YTD: 1.44%
• 6M: 1.76%
• 1Y: 3.81%
• 3Y*: —
• 5Y*: —
• 10Y*: —

SPAXX

• 1D: 0.00%
• 1M: 0.28%
• YTD: 1.37%
• 6M: 1.67%
• 1Y: 3.66%
• 3Y*: 2.42%
• 5Y*: 1.45%
• 10Y*: —

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

MMKT vs. SPAXX - Yearly Performance Comparison

	2026 (YTD)	2025	2024
MMKT Texas Capital Government Money Market ETF	1.44%	4.13%	1.21%
SPAXX Fidelity Government Money Market Fund	1.37%	3.96%	1.11%

Correlation

The correlation between MMKT and SPAXX is 0.19, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.19
Correlation (All Time) Calculated using the full available price history since Sep 26, 2024	0.19

Return for Risk

MMKT vs. SPAXX — Risk / Return Rank

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

MMKT

MMKT Risk / Return Rank: 100
MMKT Sharpe Ratio Rank: 100
MMKT Sortino Ratio Rank: 100
MMKT Omega Ratio Rank: 100
MMKT Calmar Ratio Rank: 100
MMKT Martin Ratio Rank: 100

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.

MMKT vs. SPAXX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Texas Capital Government Money Market ETF (MMKT) and Fidelity Government Money Market Fund (SPAXX). 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.

	MMKT	SPAXX	Difference
Sharpe ratio: Return per unit of total volatility	16.49	3.65	+12.84
Sortino ratio: Return per unit of downside risk	62.61	—	—
Omega ratio: Gain probability vs. loss probability	15.14	—	—
Calmar ratio: Return relative to maximum drawdown	153.44	—	—
Martin ratio: Return relative to average drawdown	910.67	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MMKT vs. SPAXX - Sharpe Ratio Comparison

The current MMKT Sharpe Ratio is 16.49, which is higher than the SPAXX Sharpe Ratio of 3.65. The chart below compares the historical Sharpe Ratios of MMKT and SPAXX, 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

	MMKT	SPAXX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	16.49	3.65	+12.84
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	2.13	—
Sharpe Ratio (All Time) Calculated using the full available price history	17.60	2.13	+15.48

Drawdowns

MMKT vs. SPAXX - Drawdown Comparison

The maximum MMKT drawdown since its inception was -0.04%, which is greater than SPAXX's maximum drawdown of 0.00%. Use the drawdown chart below to compare losses from any high point for MMKT and SPAXX.

Drawdown Indicators

	MMKT	SPAXX	Difference
Max Drawdown Largest peak-to-trough decline	-0.04%	0.00%	-0.04%
Max Drawdown (1Y) Largest decline over 1 year	-0.02%	0.00%	-0.02%
Max Drawdown (3Y) Largest decline over 3 years	—	0.00%	—
Max Drawdown (5Y) Largest decline over 5 years	—	0.00%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.00%	0.00%	0.00%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.00%	0.00%	0.00%

Volatility

MMKT vs. SPAXX - Volatility Comparison

The current volatility for Texas Capital Government Money Market ETF (MMKT) is 0.05%, while Fidelity Government Money Market Fund (SPAXX) has a volatility of 0.28%. This indicates that MMKT experiences smaller price fluctuations and is considered to be less risky than SPAXX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MMKT	SPAXX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.05%	0.28%	-0.23%
Volatility (6M) Calculated over the trailing 6-month period	0.13%	0.72%	-0.59%
Volatility (1Y) Calculated over the trailing 1-year period	0.23%	1.03%	-0.80%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.23%	0.69%	-0.46%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.23%	0.69%	-0.46%

MMKT vs. SPAXX - Expense Ratio Comparison

MMKT has a 0.20% expense ratio, which is lower than SPAXX's 0.42% expense ratio.

Dividends

MMKT vs. SPAXX - Dividend Comparison

MMKT's dividend yield for the trailing twelve months is around 3.73%, more than SPAXX's 3.59% yield.

Position	TTM	2025	2024	2023
MMKT Texas Capital Government Money Market ETF	3.73%	3.98%	1.07%	0.00%
SPAXX Fidelity Government Money Market Fund	3.59%	3.88%	1.53%	0.41%

Frequently Asked Questions

Can I hold both MMKT and SPAXX in my portfolio?

MMKT and SPAXX have a correlation of 0.19, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MMKT or SPAXX?

SPAXX has higher volatility (0.28%) compared to MMKT (0.05%). In terms of maximum drawdown, MMKT dropped -0.04% vs SPAXX's 0.00%.

Which has better risk-adjusted returns?

MMKT currently has the higher Sharpe Ratio (16.49 vs 3.65), 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.