COSW vs. BUYW

Last updated Jul 17, 2026

COSW (Roundhill COST WeeklyPay ETF) and BUYW (Main Buywrite ETF) are both Derivative Income funds. Both are actively managed. At a correlation of -0.04, they often move in opposite directions. COSW charges 0.99%/yr vs 1.29%/yr for BUYW.

Performance

COSW vs. BUYW - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Roundhill COST WeeklyPay ETF (COSW) and Main Buywrite ETF (BUYW). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, COSW achieves a 9.32% return, which is significantly higher than BUYW's 4.85% return.

COSW

• 1D: 3.90%
• 1M: -5.40%
• 6M: -3.14%
• YTD: 9.32%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

BUYW

• 1D: 0.03%
• 1M: 1.13%
• 6M: 4.85%
• YTD: 4.85%
• 1Y: 9.73%
• 3Y*: 8.74%
• 5Y*: —
• 10Y*: —

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

COSW vs. BUYW - Yearly Performance Comparison

	2026 (YTD)	2025
COSW Roundhill COST WeeklyPay ETF	9.32%	-10.48%
BUYW Main Buywrite ETF	4.85%	2.30%

Correlation

The correlation between COSW and BUYW is -0.04, 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 (All Time) Calculated using the full available price history since Oct 23, 2025	-0.04

COSW vs. BUYW - Sectors Allocation Comparison

Sectors	COSW	BUYW
Consumer Defensive	8.5%	3.0%
Basic Materials	-	1.0%
Communication Services	-	16.4%
Consumer Cyclical	-	6.4%
Energy	-	12.7%
Financial Services	-	14.5%
Healthcare	-	13.0%
Industrials	-	4.4%
Real Estate	-	0.9%
Technology	-	26.6%
Utilities	-	1.2%

Return for Risk

COSW vs. BUYW — Risk / Return Rank

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

COSW

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

BUYW

BUYW Risk / Return Rank: 85
BUYW Sharpe Ratio Rank: 79
BUYW Sortino Ratio Rank: 83
BUYW Omega Ratio Rank: 83
BUYW Calmar Ratio Rank: 86
BUYW Martin Ratio Rank: 94

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.

COSW vs. BUYW - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Roundhill COST WeeklyPay ETF (COSW) and Main Buywrite ETF (BUYW). 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.

	COSW	BUYW	Difference
Sharpe ratio: Return per unit of total volatility	—	2.02	—
Sortino ratio: Return per unit of downside risk	—	3.00	—
Omega ratio: Gain probability vs. loss probability	—	1.39	—
Calmar ratio: Return relative to maximum drawdown	—	3.77	—
Martin ratio: Return relative to average drawdown	—	20.14	—

Drawdowns

COSW vs. BUYW - Drawdown Comparison

The maximum COSW drawdown since its inception was -20.01%, which is greater than BUYW's maximum drawdown of -9.36%. Use the drawdown chart below to compare losses from any high point for COSW and BUYW.

Drawdown Indicators

	COSW	BUYW	Difference
Max Drawdown Largest peak-to-trough decline	-20.01%	-9.36%	-10.65%
Max Drawdown (1Y) Largest decline over 1 year	—	-2.59%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-9.36%	—
Current Drawdown Current decline from peak	-16.77%	0.00%	-16.77%
Average Drawdown Average peak-to-trough decline	-5.99%	-0.59%	-5.40%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.48%	—

Volatility

Volatility by Period

	COSW	BUYW	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	1.31%	—
Volatility (6M) Calculated over the trailing 6-month period	—	3.89%	—
Volatility (1Y) Calculated over the trailing 1-year period	26.16%	4.84%	+21.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.16%	8.38%	+17.78%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.16%	8.38%	+17.78%

COSW vs. BUYW - Expense Ratio Comparison

COSW has a 0.99% expense ratio, which is lower than BUYW's 1.29% expense ratio.

Dividends

COSW vs. BUYW - Dividend Comparison

COSW's dividend yield for the trailing twelve months is around 21.43%, more than BUYW's 5.88% yield.

Position	TTM	2025	2024	2023	2022
BUYW Main Buywrite ETF	5.88%	5.89%	5.93%	5.95%	0.50%
COSW Roundhill COST WeeklyPay ETF	21.43%	4.96%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both COSW and BUYW in my portfolio?

COSW and BUYW have a correlation of -0.04, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, COSW or BUYW?

On fees, COSW is cheaper at 0.99% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, COSW or BUYW?

COSW is cheaper with a 0.99% expense ratio, compared with 1.29% for BUYW.

Which ETF pays a higher dividend yield, COSW or BUYW?

COSW has the higher dividend yield at 21.43%, compared with 5.88% for BUYW.

What is the main difference between COSW and BUYW?

They also come from different issuers: Roundhill and Main Funds. Their fees differ too: 0.99% for COSW and 1.29% for BUYW.