COWZ vs. WEEK

Last updated Jun 24, 2026

COWZ (Pacer US Cash Cows 100 ETF) and WEEK (Roundhill Weekly T-Bill ETF) are both exchange-traded funds - COWZ is a Mid Cap Value Equities fund tracking the Pacer US Cash Cows 100 Index, while WEEK is a Ultrashort Bond fund actively managed by Roundhill. COWZ is passively managed, while WEEK is actively managed. Over the past year, COWZ returned 15.76% vs 3.72% for WEEK. At a 0.01 correlation, their price movements are largely independent. COWZ charges 0.49%/yr vs 0.19%/yr for WEEK.

Performance

COWZ vs. WEEK - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Pacer US Cash Cows 100 ETF (COWZ) and Roundhill Weekly T-Bill ETF (WEEK). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, COWZ achieves a 3.27% return, which is significantly higher than WEEK's 1.56% return.

COWZ

• 1D: 0.59%
• 1M: -3.72%
• YTD: 3.27%
• 6M: 2.69%
• 1Y: 15.76%
• 3Y*: 12.38%
• 5Y*: 9.90%
• 10Y*: —

WEEK

• 1D: -0.09%
• 1M: 0.24%
• YTD: 1.56%
• 6M: 1.70%
• 1Y: 3.72%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

COWZ vs. WEEK - Yearly Performance Comparison

	2026 (YTD)	2025
COWZ Pacer US Cash Cows 100 ETF	3.27%	11.00%
WEEK Roundhill Weekly T-Bill ETF	1.56%	3.37%

Correlation

The correlation between COWZ and WEEK 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 (1Y) Calculated over the trailing 1-year period	-0.04
Correlation (All Time) Calculated using the full available price history since Mar 6, 2025	0.01

Return for Risk

COWZ vs. WEEK — Risk / Return Rank

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

COWZ

COWZ Risk / Return Rank: 45
COWZ Sharpe Ratio Rank: 41
COWZ Sortino Ratio Rank: 42
COWZ Omega Ratio Rank: 39
COWZ Calmar Ratio Rank: 56
COWZ Martin Ratio Rank: 48

WEEK

WEEK Risk / Return Rank: 99
WEEK Sharpe Ratio Rank: 99
WEEK Sortino Ratio Rank: 99
WEEK Omega Ratio Rank: 99
WEEK Calmar Ratio Rank: 99
WEEK Martin Ratio Rank: 99

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.

COWZ vs. WEEK - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Pacer US Cash Cows 100 ETF (COWZ) and Roundhill Weekly T-Bill ETF (WEEK). 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.

	COWZ	WEEK	Difference
Sharpe ratio: Return per unit of total volatility	1.39	8.53	-7.14
Sortino ratio: Return per unit of downside risk	2.05	16.60	-14.55
Omega ratio: Gain probability vs. loss probability	1.25	4.07	-2.82
Calmar ratio: Return relative to maximum drawdown	2.66	28.78	-26.12
Martin ratio: Return relative to average drawdown	7.92	233.16	-225.24

COWZ vs. WEEK - Sharpe Ratio Comparison

The current COWZ Sharpe Ratio is 1.39, which is lower than the WEEK Sharpe Ratio of 8.53. The chart below compares the historical Sharpe Ratios of COWZ and WEEK, 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

COWZ vs. WEEK - Drawdown Comparison

The maximum COWZ drawdown since its inception was -38.63%, which is greater than WEEK's maximum drawdown of -0.13%. Use the drawdown chart below to compare losses from any high point for COWZ and WEEK.

Drawdown Indicators

	COWZ	WEEK	Difference
Max Drawdown Largest peak-to-trough decline	-38.63%	-0.13%	-38.50%
Max Drawdown (1Y) Largest decline over 1 year	-5.95%	-0.13%	-5.82%
Max Drawdown (3Y) Largest decline over 3 years	-22.00%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-22.00%	—	—
Current Drawdown Current decline from peak	-5.40%	-0.09%	-5.31%
Average Drawdown Average peak-to-trough decline	-4.80%	-0.01%	-4.79%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.00%	0.02%	+1.98%

Volatility

COWZ vs. WEEK - Volatility Comparison

Pacer US Cash Cows 100 ETF (COWZ) has a higher volatility of 3.97% compared to Roundhill Weekly T-Bill ETF (WEEK) at 0.16%. This indicates that COWZ's price experiences larger fluctuations and is considered to be riskier than WEEK based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COWZ	WEEK	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.97%	0.16%	+3.81%
Volatility (6M) Calculated over the trailing 6-month period	7.53%	0.29%	+7.24%
Volatility (1Y) Calculated over the trailing 1-year period	11.38%	0.44%	+10.94%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.64%	0.40%	+17.24%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.90%	0.40%	+19.50%

COWZ vs. WEEK - Expense Ratio Comparison

COWZ has a 0.49% expense ratio, which is higher than WEEK's 0.19% expense ratio.

Dividends

COWZ vs. WEEK - Dividend Comparison

COWZ's dividend yield for the trailing twelve months is around 2.00%, less than WEEK's 3.70% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
COWZ Pacer US Cash Cows 100 ETF	2.00%	2.19%	1.82%	1.92%	1.96%	1.48%	2.54%	1.96%	1.67%	1.95%	0.13%
WEEK Roundhill Weekly T-Bill ETF	3.70%	3.27%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both COWZ and WEEK in my portfolio?

COWZ and WEEK 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 is riskier, COWZ or WEEK?

COWZ has higher volatility (3.97%) compared to WEEK (0.16%). In terms of maximum drawdown, COWZ dropped -38.63% vs WEEK's -0.13%.

Which ETF is better, COWZ or WEEK?

On 1-year performance, COWZ leads with 15.76% vs 3.72% for WEEK. On fees, WEEK is cheaper at 0.19% per year. On volatility, WEEK has been the lower-risk option at 0.16%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, COWZ or WEEK?

Over the 1-year period, COWZ has performed better with a 15.76% return vs 3.72%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, COWZ or WEEK?

WEEK is cheaper with a 0.19% expense ratio, compared with 0.49% for COWZ.

Which ETF pays a higher dividend yield, COWZ or WEEK?

WEEK has the higher dividend yield at 3.70%, compared with 2.00% for COWZ.

What is the main difference between COWZ and WEEK?

COWZ is categorized as Mid Cap Value Equities, while WEEK is Ultrashort Bond. They also come from different issuers: Pacer and Roundhill. Their fees differ too: 0.49% for COWZ and 0.19% for WEEK.

Which has better risk-adjusted returns?

WEEK currently has the higher Sharpe Ratio (8.53 vs 1.39), 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.