GSY vs. COST

Last updated Jun 14, 2026

GSY (Invesco Ultra Short Duration ETF) is Ultrashort Bond fund actively managed by Invesco, while COST (Costco Wholesale Corporation) is a stock. Over the past 10 years, GSY returned 2.86%/yr vs 22.27%/yr for COST. At a 0.01 correlation, their price movements are largely independent.

Performance

GSY vs. COST - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco Ultra Short Duration ETF (GSY) and Costco Wholesale Corporation (COST). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, GSY achieves a 1.72% return, which is significantly lower than COST's 14.24% return. Over the past 10 years, GSY has underperformed COST with an annualized return of 2.86%, while COST has yielded a comparatively higher 22.27% annualized return.

GSY

• 1D: 0.00%
• 1M: 0.36%
• YTD: 1.72%
• 6M: 1.96%
• 1Y: 4.49%
• 3Y*: 5.48%
• 5Y*: 3.68%
• 10Y*: 2.86%

COST

• 1D: 0.68%
• 1M: -5.66%
• YTD: 14.24%
• 6M: 11.38%
• 1Y: -0.24%
• 3Y*: 25.12%
• 5Y*: 22.12%
• 10Y*: 22.27%

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

GSY vs. COST - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
GSY Invesco Ultra Short Duration ETF	1.72%	4.96%	5.95%	5.99%	0.01%	0.03%	1.88%	3.39%	2.18%	1.86%
COST Costco Wholesale Corporation	14.24%	-5.39%	39.62%	49.00%	-19.05%	51.82%	32.67%	45.70%	10.60%	22.37%

Correlation

The correlation between GSY and COST is -0.11, 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	-0.11
Correlation (3Y) Calculated over the trailing 3-year period	0.02
Correlation (5Y) Calculated over the trailing 5-year period	0.05
Correlation (10Y) Calculated over the trailing 10-year period	0.02
Correlation (All Time) Calculated using the full available price history since Feb 12, 2008	0.01

The correlation between GSY and COST shifts across timeframes, from -0.11 (1 year) to 0.05 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

GSY vs. COST — Risk / Return Rank

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

GSY

GSY Risk / Return Rank: 99
GSY Sharpe Ratio Rank: 100
GSY Sortino Ratio Rank: 99
GSY Omega Ratio Rank: 99
GSY Calmar Ratio Rank: 100
GSY Martin Ratio Rank: 100

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

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.

GSY vs. COST - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Ultra Short Duration ETF (GSY) and Costco Wholesale Corporation (COST). 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.

	GSY	COST	Difference
Sharpe ratio: Return per unit of total volatility	11.20	-0.08	+11.28
Sortino ratio: Return per unit of downside risk	27.35	0.02	+27.33
Omega ratio: Gain probability vs. loss probability	6.54	1.00	+5.53
Calmar ratio: Return relative to maximum drawdown	75.72	-0.10	+75.81
Martin ratio: Return relative to average drawdown	373.96	-0.22	+374.18

GSY vs. COST - Sharpe Ratio Comparison

The current GSY Sharpe Ratio is 11.20, which is higher than the COST Sharpe Ratio of -0.08. The chart below compares the historical Sharpe Ratios of GSY and COST, 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

GSY vs. COST - Drawdown Comparison

The maximum GSY drawdown since its inception was -12.14%, smaller than the maximum COST drawdown of -53.39%. Use the drawdown chart below to compare losses from any high point for GSY and COST.

Drawdown Indicators

	GSY	COST	Difference
Max Drawdown Largest peak-to-trough decline	-12.14%	-53.39%	+41.25%
Max Drawdown (1Y) Largest decline over 1 year	-0.06%	-15.14%	+15.08%
Max Drawdown (3Y) Largest decline over 3 years	-0.18%	-20.74%	+20.56%
Max Drawdown (5Y) Largest decline over 5 years	-1.48%	-31.40%	+29.92%
Max Drawdown (10Y) Largest decline over 10 years	-5.25%	-31.40%	+26.15%
Current Drawdown Current decline from peak	0.00%	-10.23%	+10.23%
Average Drawdown Average peak-to-trough decline	-2.38%	-13.36%	+10.98%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.01%	6.67%	-6.66%

Volatility

GSY vs. COST - Volatility Comparison

The current volatility for Invesco Ultra Short Duration ETF (GSY) is 0.15%, while Costco Wholesale Corporation (COST) has a volatility of 7.44%. This indicates that GSY experiences smaller price fluctuations and is considered to be less risky than COST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GSY	COST	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.15%	7.44%	-7.29%
Volatility (6M) Calculated over the trailing 6-month period	0.31%	14.53%	-14.22%
Volatility (1Y) Calculated over the trailing 1-year period	0.40%	18.80%	-18.40%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.58%	22.72%	-22.14%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.22%	21.95%	-20.73%

Dividends

GSY vs. COST - Dividend Comparison

GSY's dividend yield for the trailing twelve months is around 4.34%, more than COST's 0.55% 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%
GSY Invesco Ultra Short Duration ETF	4.34%	4.56%	5.31%	4.95%	1.70%	0.58%	1.45%	2.71%	2.30%	1.80%	1.21%	1.17%

Frequently Asked Questions

Can I hold both GSY and COST in my portfolio?

GSY and COST have a correlation of -0.11, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, GSY or COST?

COST has higher volatility (7.44%) compared to GSY (0.15%). In terms of maximum drawdown, GSY dropped -12.14% vs COST's -53.39%.

Which has better risk-adjusted returns?

GSY currently has the higher Sharpe Ratio (11.20 vs -0.08), 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.