IVVW vs. COSW

Last updated Apr 1, 2026

Compare and contrast key facts about iShares S&P 500 BuyWrite ETF (IVVW) and Roundhill COST WeeklyPay ETF (COSW).

IVVW and COSW are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. IVVW is a passively managed fund by iShares that tracks the performance of the Cboe S&P 500 Enhanced 1% OTM BuyWrite Index. It was launched on Mar 14, 2024. COSW is an actively managed fund by Roundhill. It was launched on Oct 23, 2025.

Performance

IVVW vs. COSW - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares S&P 500 BuyWrite ETF (IVVW) and Roundhill COST WeeklyPay ETF (COSW). The values are adjusted to include any dividend payments, if applicable.

IVVW vs. COSW - Yearly Performance Comparison

	2026 (YTD)	2025
IVVW iShares S&P 500 BuyWrite ETF	-1.71%	3.61%
COSW Roundhill COST WeeklyPay ETF	17.20%	-10.71%

Returns By Period

In the year-to-date period, IVVW achieves a -1.71% return, which is significantly lower than COSW's 17.20% return.

IVVW

• 1D: 2.49%
• 1M: -2.87%
• YTD: -1.71%
• 6M: 3.73%
• 1Y: 13.57%
• 3Y*: —
• 5Y*: —
• 10Y*: —

COSW

• 1D: -0.54%
• 1M: -2.62%
• YTD: 17.20%
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

IVVW vs. COSW - Expense Ratio Comparison

IVVW has a 0.25% expense ratio, which is lower than COSW's 0.99% expense ratio.

COSW

Roundhill COST WeeklyPay ETF

IVVW

iShares S&P 500 BuyWrite ETF

Return for Risk

IVVW vs. COSW — Risk / Return Rank

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

IVVW

IVVW Risk / Return Rank: 62
IVVW Sharpe Ratio Rank: 51
IVVW Sortino Ratio Rank: 55
IVVW Omega Ratio Rank: 76
IVVW Calmar Ratio Rank: 52
IVVW Martin Ratio Rank: 74

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.

IVVW vs. COSW - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares S&P 500 BuyWrite ETF (IVVW) and Roundhill COST WeeklyPay ETF (COSW). 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.

	IVVW	COSW	Difference
Sharpe ratio Return per unit of total volatility	0.88	—	—
Sortino ratio Return per unit of downside risk	1.39	—	—
Omega ratio Gain probability vs. loss probability	1.28	—	—
Calmar ratio Return relative to maximum drawdown	1.24	—	—
Martin ratio Return relative to average drawdown	7.46	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	IVVW	COSW	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.88	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.85	0.44	+0.41

Correlation

The correlation between IVVW and COSW is 0.02, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

IVVW vs. COSW - Dividend Comparison

IVVW's dividend yield for the trailing twelve months is around 19.90%, more than COSW's 12.26% yield.

	TTM	2025	2024
IVVW iShares S&P 500 BuyWrite ETF	19.90%	18.55%	13.72%
COSW Roundhill COST WeeklyPay ETF	12.26%	4.96%	0.00%

Drawdowns

IVVW vs. COSW - Drawdown Comparison

The maximum IVVW drawdown since its inception was -16.79%, which is greater than COSW's maximum drawdown of -12.17%. Use the drawdown chart below to compare losses from any high point for IVVW and COSW.

Drawdown Indicators

	IVVW	COSW	Difference
Max Drawdown Largest peak-to-trough decline	-16.79%	-12.17%	-4.62%
Max Drawdown (1Y) Largest decline over 1 year	-11.21%	—	—
Current Drawdown Current decline from peak	-3.47%	-3.28%	-0.19%
Average Drawdown Average peak-to-trough decline	-1.87%	-4.05%	+2.18%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.87%	—	—

Volatility

Volatility by Period

	IVVW	COSW	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.53%	—	—
Volatility (6M) Calculated over the trailing 6-month period	6.61%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	15.56%	25.36%	-9.80%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	13.11%	25.36%	-12.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	13.11%	25.36%	-12.25%