PSU-U.TO vs. ZMMK.TO

Last updated Jun 4, 2026

PSU-U.TO (Purpose US Cash Fund) and ZMMK.TO (BMO Money Market Fund ETF Series) are both Money Market funds. Both are actively managed. Over the past 3 years, PSU-U.TO returned 3.37%/yr vs 2.67%/yr for ZMMK.TO. At a correlation of -0.03, they often move in opposite directions. PSU-U.TO charges 0.17%/yr vs 0.13%/yr for ZMMK.TO.

Performance

PSU-U.TO vs. ZMMK.TO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Purpose US Cash Fund (PSU-U.TO) and BMO Money Market Fund ETF Series (ZMMK.TO). The values are adjusted to include any dividend payments, if applicable.

Different Trading Currencies

PSU-U.TO is traded in USD, while ZMMK.TO is traded in CAD. To make them comparable, the ZMMK.TO values have been converted to USD using the latest available exchange rates.

Returns By Period

In the year-to-date period, PSU-U.TO achieves a 1.05% return, which is significantly higher than ZMMK.TO's -0.30% return.

PSU-U.TO

• 1D: 0.01%
• 1M: 0.22%
• YTD: 1.05%
• 6M: 1.22%
• 1Y: 2.73%
• 3Y*: 3.37%
• 5Y*: 2.66%
• 10Y*: —

ZMMK.TO

• 1D: -0.41%
• 1M: -1.80%
• YTD: -0.30%
• 6M: 1.52%
• 1Y: 1.17%
• 3Y*: 2.67%
• 5Y*: —
• 10Y*: —

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

PSU-U.TO vs. ZMMK.TO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
PSU-U.TO Purpose US Cash Fund	1.05%	2.97%	3.67%	3.93%	1.50%	0.03%
ZMMK.TO BMO Money Market Fund ETF Series	-0.30%	7.69%	-3.35%	7.25%	-4.84%	1.36%

Correlation

The correlation between PSU-U.TO and ZMMK.TO 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 (3Y) Calculated over the trailing 3-year period	-0.03
Correlation (All Time) Calculated using the full available price history since Dec 3, 2021	-0.03

Return for Risk

PSU-U.TO vs. ZMMK.TO — Risk / Return Rank

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

PSU-U.TO

PSU-U.TO Risk / Return Rank: 99
PSU-U.TO Sharpe Ratio Rank: 99
PSU-U.TO Sortino Ratio Rank: 99
PSU-U.TO Omega Ratio Rank: 99
PSU-U.TO Calmar Ratio Rank: 99
PSU-U.TO Martin Ratio Rank: 99

ZMMK.TO

ZMMK.TO Risk / Return Rank: 100
ZMMK.TO Sharpe Ratio Rank: 99
ZMMK.TO Sortino Ratio Rank: 100
ZMMK.TO Omega Ratio Rank: 99
ZMMK.TO Calmar Ratio Rank: 100
ZMMK.TO Martin Ratio Rank: 100

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.

PSU-U.TO vs. ZMMK.TO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Purpose US Cash Fund (PSU-U.TO) and BMO Money Market Fund ETF Series (ZMMK.TO). 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.

	PSU-U.TO	ZMMK.TO	Difference
Sharpe ratio: Return per unit of total volatility	7.82	0.26	+7.56
Sortino ratio: Return per unit of downside risk	10.99	0.43	+10.55
Omega ratio: Gain probability vs. loss probability	4.08	1.05	+3.03
Calmar ratio: Return relative to maximum drawdown	24.96	0.41	+24.55
Martin ratio: Return relative to average drawdown	105.69	0.83	+104.86
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PSU-U.TO vs. ZMMK.TO - Sharpe Ratio Comparison

The current PSU-U.TO Sharpe Ratio is 7.82, which is higher than the ZMMK.TO Sharpe Ratio of 0.26. The chart below compares the historical Sharpe Ratios of PSU-U.TO and ZMMK.TO, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	PSU-U.TO	ZMMK.TO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	7.82	0.26	+7.56
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	7.13	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	6.13	0.26	+5.88

Drawdowns

PSU-U.TO vs. ZMMK.TO - Drawdown Comparison

The maximum PSU-U.TO drawdown since its inception was -0.12%, smaller than the maximum ZMMK.TO drawdown of -9.20%. Use the drawdown chart below to compare losses from any high point for PSU-U.TO and ZMMK.TO.

Drawdown Indicators

	PSU-U.TO	ZMMK.TO	Difference
Max Drawdown Largest peak-to-trough decline	-0.12%	-9.20%	+9.08%
Max Drawdown (1Y) Largest decline over 1 year	-0.11%	-2.89%	+2.78%
Max Drawdown (3Y) Largest decline over 3 years	-0.12%	-6.27%	+6.15%
Max Drawdown (5Y) Largest decline over 5 years	-0.12%	—	—
Current Drawdown Current decline from peak	0.00%	-2.17%	+2.17%
Average Drawdown Average peak-to-trough decline	-0.01%	-2.58%	+2.57%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.03%	1.41%	-1.38%

Volatility

PSU-U.TO vs. ZMMK.TO - Volatility Comparison

The current volatility for Purpose US Cash Fund (PSU-U.TO) is 0.10%, while BMO Money Market Fund ETF Series (ZMMK.TO) has a volatility of 0.82%. This indicates that PSU-U.TO experiences smaller price fluctuations and is considered to be less risky than ZMMK.TO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PSU-U.TO	ZMMK.TO	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.10%	0.82%	-0.72%
Volatility (6M) Calculated over the trailing 6-month period	0.23%	3.39%	-3.16%
Volatility (1Y) Calculated over the trailing 1-year period	0.35%	4.50%	-4.15%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.37%	6.22%	-5.85%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.33%	6.22%	-5.89%

PSU-U.TO vs. ZMMK.TO - Expense Ratio Comparison

PSU-U.TO has a 0.17% expense ratio, which is higher than ZMMK.TO's 0.13% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

PSU-U.TO vs. ZMMK.TO - Dividend Comparison

PSU-U.TO's dividend yield for the trailing twelve months is around 2.70%, more than ZMMK.TO's 2.53% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
PSU-U.TO Purpose US Cash Fund	2.70%	2.90%	3.65%	3.87%	1.45%	0.29%	0.41%	1.70%	1.20%
ZMMK.TO BMO Money Market Fund ETF Series	2.53%	3.02%	4.66%	4.98%	1.95%	0.04%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both PSU-U.TO and ZMMK.TO in my portfolio?

PSU-U.TO and ZMMK.TO 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, PSU-U.TO or ZMMK.TO?

On fees, ZMMK.TO is cheaper at 0.13% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, PSU-U.TO or ZMMK.TO?

ZMMK.TO is cheaper with a 0.13% expense ratio, compared with 0.17% for PSU-U.TO.

What is the main difference between PSU-U.TO and ZMMK.TO?

They also come from different issuers: Purpose Investments and BMO. Their fees differ too: 0.17% for PSU-U.TO and 0.13% for ZMMK.TO.