COSW vs. BUCK

Last updated Jun 25, 2026

COSW (Roundhill COST WeeklyPay ETF) and BUCK (Simplify Treasury Option Income ETF) are both exchange-traded funds - COSW is a Derivative Income fund actively managed by Roundhill, while BUCK is a Government Bonds fund actively managed by Simplify. Both are actively managed. At a 0.09 correlation, their price movements are largely independent. COSW charges 0.99%/yr vs 0.35%/yr for BUCK.

Performance

COSW vs. BUCK - Performance Comparison

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

Returns By Period

In the year-to-date period, COSW achieves a 11.78% return, which is significantly higher than BUCK's 2.29% return.

COSW

• 1D: 0.24%
• 1M: -8.28%
• YTD: 11.78%
• 6M: 10.24%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

BUCK

• 1D: 0.17%
• 1M: 0.38%
• YTD: 2.29%
• 6M: 2.48%
• 1Y: 6.70%
• 3Y*: 5.30%
• 5Y*: —
• 10Y*: —

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

COSW vs. BUCK - Yearly Performance Comparison

	2026 (YTD)	2025
COSW Roundhill COST WeeklyPay ETF	11.78%	-10.48%
BUCK Simplify Treasury Option Income ETF	2.29%	0.86%

Correlation

The correlation between COSW and BUCK is 0.09, 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	0.09

Return for Risk

COSW vs. BUCK — 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.

BUCK

BUCK Risk / Return Rank: 87
BUCK Sharpe Ratio Rank: 80
BUCK Sortino Ratio Rank: 83
BUCK Omega Ratio Rank: 88
BUCK Calmar Ratio Rank: 91
BUCK Martin Ratio Rank: 95

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. BUCK - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Roundhill COST WeeklyPay ETF (COSW) and Simplify Treasury Option Income ETF (BUCK). 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	BUCK	Difference
Sharpe ratio: Return per unit of total volatility	—	2.27	—
Sortino ratio: Return per unit of downside risk	—	3.33	—
Omega ratio: Gain probability vs. loss probability	—	1.49	—
Calmar ratio: Return relative to maximum drawdown	—	5.14	—
Martin ratio: Return relative to average drawdown	—	27.77	—

Drawdowns

COSW vs. BUCK - Drawdown Comparison

The maximum COSW drawdown since its inception was -16.24%, which is greater than BUCK's maximum drawdown of -5.43%. Use the drawdown chart below to compare losses from any high point for COSW and BUCK.

Drawdown Indicators

	COSW	BUCK	Difference
Max Drawdown Largest peak-to-trough decline	-16.24%	-5.43%	-10.81%
Max Drawdown (1Y) Largest decline over 1 year	—	-1.31%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-5.43%	—
Current Drawdown Current decline from peak	-14.89%	0.00%	-14.89%
Average Drawdown Average peak-to-trough decline	-4.94%	-0.49%	-4.45%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.24%	—

Volatility

Volatility by Period

	COSW	BUCK	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.32%	—
Volatility (6M) Calculated over the trailing 6-month period	—	1.38%	—
Volatility (1Y) Calculated over the trailing 1-year period	25.46%	2.98%	+22.48%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	25.46%	3.46%	+22.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	25.46%	3.46%	+22.00%

COSW vs. BUCK - Expense Ratio Comparison

COSW has a 0.99% expense ratio, which is higher than BUCK's 0.35% expense ratio.

Dividends

COSW vs. BUCK - Dividend Comparison

COSW's dividend yield for the trailing twelve months is around 19.61%, more than BUCK's 7.39% yield.

Position	TTM	2025	2024	2023	2022
BUCK Simplify Treasury Option Income ETF	7.39%	7.59%	8.84%	4.84%	0.59%
COSW Roundhill COST WeeklyPay ETF	19.61%	4.96%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both COSW and BUCK in my portfolio?

COSW and BUCK have a correlation of 0.09, 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 BUCK?

On fees, BUCK is cheaper at 0.35% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, COSW or BUCK?

BUCK is cheaper with a 0.35% expense ratio, compared with 0.99% for COSW.

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

COSW has the higher dividend yield at 19.61%, compared with 7.39% for BUCK.

What is the main difference between COSW and BUCK?

COSW is categorized as Derivative Income, while BUCK is Government Bonds. They also come from different issuers: Roundhill and Simplify. Their fees differ too: 0.99% for COSW and 0.35% for BUCK.