COST vs. PSA.TO

Last updated Jun 13, 2026

COST (Costco Wholesale Corporation) is a stock, while PSA.TO (Purpose High Interest Savings Fund) is Money Market fund actively managed by Purpose Investments. Over the past 10 years, COST returned 22.27%/yr vs 1.39%/yr for PSA.TO. At a correlation of -0.01, they often move in opposite directions.

Performance

COST vs. PSA.TO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Costco Wholesale Corporation (COST) and Purpose High Interest Savings Fund (PSA.TO). The values are adjusted to include any dividend payments, if applicable.

Different Trading Currencies

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

Returns By Period

In the year-to-date period, COST achieves a 14.24% return, which is significantly higher than PSA.TO's -1.03% return. Over the past 10 years, COST has outperformed PSA.TO with an annualized return of 22.27%, while PSA.TO has yielded a comparatively lower 1.39% annualized return.

COST

• 1D: 0.68%
• 1M: -6.35%
• YTD: 14.24%
• 6M: 11.38%
• 1Y: -0.24%
• 3Y*: 25.12%
• 5Y*: 22.12%
• 10Y*: 22.27%

PSA.TO

• 1D: -0.16%
• 1M: -1.63%
• YTD: -1.03%
• 6M: -0.32%
• 1Y: -0.42%
• 3Y*: 2.18%
• 5Y*: 0.24%
• 10Y*: 1.39%

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

COST vs. PSA.TO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
COST Costco Wholesale Corporation	14.24%	-5.39%	39.62%	49.00%	-19.05%	51.82%	32.67%	45.70%	10.60%	22.37%
PSA.TO Purpose High Interest Savings Fund	-1.03%	7.55%	-3.61%	7.69%	-3.77%	0.66%	3.38%	6.61%	-6.23%	8.42%

Correlation

The correlation between COST and PSA.TO is -0.17, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.17
Correlation (3Y) Calculated over the trailing 3-year period	0.01
Correlation (5Y) Calculated over the trailing 5-year period	-0.02
Correlation (10Y) Calculated over the trailing 10-year period	-0.01
Correlation (All Time) Calculated using the full available price history since Oct 15, 2013	-0.01

The correlation between COST and PSA.TO shifts across timeframes, from -0.17 (1 year) to 0.01 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

COST vs. PSA.TO — Risk / Return Rank

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

COST

COST Risk / Return Rank: 37
COST Sharpe Ratio Rank: 40
COST Sortino Ratio Rank: 32
COST Omega Ratio Rank: 32
COST Calmar Ratio Rank: 40
COST Martin Ratio Rank: 39

PSA.TO

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

COST vs. PSA.TO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Costco Wholesale Corporation (COST) and Purpose High Interest Savings Fund (PSA.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.

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.

	COST	PSA.TO	Difference
Sharpe ratio: Return per unit of total volatility	-0.08	0.03	-0.11
Sortino ratio: Return per unit of downside risk	0.02	0.08	-0.06
Omega ratio: Gain probability vs. loss probability	1.00	1.01	-0.01
Calmar ratio: Return relative to maximum drawdown	-0.10	0.04	-0.14
Martin ratio: Return relative to average drawdown	-0.22	0.08	-0.31

COST vs. PSA.TO - Sharpe Ratio Comparison

The current COST Sharpe Ratio is -0.08, which is lower than the PSA.TO Sharpe Ratio of 0.03. The chart below compares the historical Sharpe Ratios of COST and PSA.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.

Drawdowns

COST vs. PSA.TO - Drawdown Comparison

The maximum COST drawdown since its inception was -53.39%, which is greater than PSA.TO's maximum drawdown of -27.47%. Use the drawdown chart below to compare losses from any high point for COST and PSA.TO.

Drawdown Indicators

	COST	PSA.TO	Difference
Max Drawdown Largest peak-to-trough decline	-53.39%	-27.47%	-25.92%
Max Drawdown (1Y) Largest decline over 1 year	-15.14%	-2.97%	-12.17%
Max Drawdown (3Y) Largest decline over 3 years	-20.74%	-7.62%	-13.12%
Max Drawdown (5Y) Largest decline over 5 years	-31.40%	-10.54%	-20.86%
Max Drawdown (10Y) Largest decline over 10 years	-31.40%	-12.51%	-18.89%
Current Drawdown Current decline from peak	-10.23%	-5.01%	-5.22%
Average Drawdown Average peak-to-trough decline	-13.36%	-12.58%	-0.78%
Ulcer Index Depth and duration of drawdowns from previous peaks	6.67%	1.54%	+5.13%

Volatility

COST vs. PSA.TO - Volatility Comparison

Costco Wholesale Corporation (COST) has a higher volatility of 7.44% compared to Purpose High Interest Savings Fund (PSA.TO) at 0.75%. This indicates that COST's price experiences larger fluctuations and is considered to be riskier than PSA.TO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COST	PSA.TO	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.44%	0.75%	+6.69%
Volatility (6M) Calculated over the trailing 6-month period	14.53%	3.20%	+11.33%
Volatility (1Y) Calculated over the trailing 1-year period	18.80%	4.37%	+14.43%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.72%	6.29%	+16.43%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.95%	6.62%	+15.33%

Dividends

COST vs. PSA.TO - Dividend Comparison

COST's dividend yield for the trailing twelve months is around 0.55%, less than PSA.TO's 2.33% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COST Costco Wholesale Corporation	0.55%	0.59%	0.49%	2.87%	0.76%	0.54%	3.38%	0.86%	1.08%	4.81%	1.09%	4.06%
PSA.TO Purpose High Interest Savings Fund	2.33%	2.61%	4.46%	5.05%	2.26%	0.59%	0.94%	2.18%	1.66%	1.07%	0.99%	1.07%

Frequently Asked Questions

Can I hold both COST and PSA.TO in my portfolio?

COST and PSA.TO have a correlation of -0.17, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.