COII vs. MRNY

Last updated Jul 16, 2026

COII (REX COIN Growth & Income ETF) and MRNY (YieldMax MRNA Option Income Strategy ETF) are both Derivative Income funds. Both are actively managed. Over the past year, COII returned -68.31% vs 67.18% for MRNY. At a 0.30 correlation, their price movements are largely independent. Both charge a 0.99% expense ratio.

Performance

COII vs. MRNY - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in REX COIN Growth & Income ETF (COII) and YieldMax MRNA Option Income Strategy ETF (MRNY). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, COII achieves a -40.76% return, which is significantly lower than MRNY's 93.46% return.

COII

• 1D: 0.00%
• 1M: 0.00%
• 6M: -47.26%
• YTD: -40.76%
• 1Y: -68.31%
• 3Y*: —
• 5Y*: —
• 10Y*: —

MRNY

• 1D: 1.05%
• 1M: 23.55%
• 6M: 49.76%
• YTD: 93.46%
• 1Y: 67.18%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

COII vs. MRNY - Yearly Performance Comparison

	2026 (YTD)	2025
COII REX COIN Growth & Income ETF	-40.76%	-26.88%
MRNY YieldMax MRNA Option Income Strategy ETF	93.46%	-2.73%

Correlation

The correlation between COII and MRNY is 0.30, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.30
Correlation (All Time) Calculated using the full available price history since Jun 4, 2025	0.30

Return for Risk

COII vs. MRNY — Risk / Return Rank

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

COII

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

MRNY

MRNY Risk / Return Rank: 45
MRNY Sharpe Ratio Rank: 44
MRNY Sortino Ratio Rank: 50
MRNY Omega Ratio Rank: 46
MRNY Calmar Ratio Rank: 52
MRNY Martin Ratio Rank: 34

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.

COII vs. MRNY - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for REX COIN Growth & Income ETF (COII) and YieldMax MRNA Option Income Strategy ETF (MRNY). 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.

	COII	MRNY	Difference
Sharpe ratio: Return per unit of total volatility	-0.98	1.28	-2.26
Sortino ratio: Return per unit of downside risk	-1.62	2.02	-3.64
Omega ratio: Gain probability vs. loss probability	0.80	1.24	-0.44
Calmar ratio: Return relative to maximum drawdown	-0.90	2.14	-3.04
Martin ratio: Return relative to average drawdown	-1.33	4.12	-5.45

COII vs. MRNY - Sharpe Ratio Comparison

The current COII Sharpe Ratio is -0.98, which is lower than the MRNY Sharpe Ratio of 1.28. The chart below compares the historical Sharpe Ratios of COII and MRNY, 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

COII vs. MRNY - Drawdown Comparison

The maximum COII drawdown since its inception was -72.22%, smaller than the maximum MRNY drawdown of -82.15%. Use the drawdown chart below to compare losses from any high point for COII and MRNY.

Drawdown Indicators

	COII	MRNY	Difference
Max Drawdown Largest peak-to-trough decline	-72.22%	-82.15%	+9.93%
Max Drawdown (1Y) Largest decline over 1 year	-72.22%	-31.53%	-40.69%
Current Drawdown Current decline from peak	-70.51%	-59.27%	-11.24%
Average Drawdown Average peak-to-trough decline	-41.08%	-52.98%	+11.90%
Ulcer Index Depth and duration of drawdowns from previous peaks	48.77%	16.34%	+32.43%

Volatility

COII vs. MRNY - Volatility Comparison

The current volatility for REX COIN Growth & Income ETF (COII) is 14.58%, while YieldMax MRNA Option Income Strategy ETF (MRNY) has a volatility of 20.13%. This indicates that COII experiences smaller price fluctuations and is considered to be less risky than MRNY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COII	MRNY	Difference
Volatility (1M) Calculated over the trailing 1-month period	14.58%	20.13%	-5.55%
Volatility (6M) Calculated over the trailing 6-month period	51.81%	39.63%	+12.18%
Volatility (1Y) Calculated over the trailing 1-year period	66.59%	52.91%	+13.68%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	66.93%	51.49%	+15.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	66.93%	51.49%	+15.44%

COII vs. MRNY - Expense Ratio Comparison

Both COII and MRNY have an expense ratio of 0.99%.

Dividends

COII vs. MRNY - Dividend Comparison

COII has not paid dividends to shareholders, while MRNY's dividend yield for the trailing twelve months is around 86.35%.

Position	TTM	2025	2024	2023
COII REX COIN Growth & Income ETF	75.93%	41.52%	0.00%	0.00%
MRNY YieldMax MRNA Option Income Strategy ETF	86.35%	145.98%	178.49%	1.75%

Frequently Asked Questions

Can I hold both COII and MRNY in my portfolio?

COII and MRNY have a correlation of 0.30, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, COII or MRNY?

MRNY has higher volatility (20.13%) compared to COII (14.58%). In terms of maximum drawdown, COII dropped -72.22% vs MRNY's -82.15%.

Which ETF is better, COII or MRNY?

On 1-year performance, MRNY leads with 67.18% vs -68.31% for COII. Both ETFs have the same 0.99% expense ratio. On volatility, COII has been the lower-risk option at 14.58%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, COII or MRNY?

Over the 1-year period, MRNY has performed better with a 67.18% return vs -68.31%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, COII or MRNY?

COII and MRNY have the same expense ratio: 0.99% per year.

Which ETF pays a higher dividend yield, COII or MRNY?

MRNY has the higher dividend yield at 86.35%, compared with 75.93% for COII.

What is the main difference between COII and MRNY?

They also come from different issuers: REX Shares and YieldMax.

Which has better risk-adjusted returns?

MRNY currently has the higher Sharpe Ratio (1.28 vs -0.98), 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.