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COST vs. IH2O.L
Performance
Return for Risk
Drawdowns
Volatility
Dividends

COST vs. IH2O.L

Last updated Jun 13, 2026

COST (Costco Wholesale Corporation) is a stock, while IH2O.L (iShares Global Water UCITS ETF) is Water Equities fund tracking the S&P Global Water TR. Over the past 10 years, COST returned 22.27%/yr vs 9.52%/yr for IH2O.L. At a 0.27 correlation, their price movements are largely independent.

Performance

COST vs. IH2O.L - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Costco Wholesale Corporation (COST) and iShares Global Water UCITS ETF (IH2O.L). The values are adjusted to include any dividend payments, if applicable.

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Different Trading Currencies

COST is traded in USD, while IH2O.L is traded in GBp. To make them comparable, the IH2O.L 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 IH2O.L's -1.72% return. Over the past 10 years, COST has outperformed IH2O.L with an annualized return of 22.27%, while IH2O.L has yielded a comparatively lower 9.52% 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%

IH2O.L

1D
0.98%
1M
1.10%
YTD
-1.72%
6M
-1.10%
1Y
3.28%
3Y*
7.92%
5Y*
4.12%
10Y*
9.52%
*Multi-year figures are annualized to reflect compound growth (CAGR)

COST vs. IH2O.L - Yearly Performance Comparison

2026 (YTD)202520242023202220212020201920182017
COST
Costco Wholesale Corporation		14.24%-5.39%39.62%49.00%-19.05%51.82%32.67%45.70%10.60%22.37%
IH2O.L
iShares Global Water UCITS ETF		-1.72%18.03%4.26%12.99%-20.80%31.05%14.70%34.62%-10.76%26.68%

Correlation

The correlation between COST and IH2O.L is 0.14, which is low. Their price movements are largely independent, making them effective diversification partners.

Correlation
Correlation (1Y)
Calculated over the trailing 1-year period

0.14

Correlation (3Y)
Calculated over the trailing 3-year period

0.16

Correlation (5Y)
Calculated over the trailing 5-year period

0.27

Correlation (10Y)
Calculated over the trailing 10-year period

0.25

Correlation (All Time)
Calculated using the full available price history since Jul 12, 2007

0.27

The correlation between COST and IH2O.L shifts across timeframes, from 0.14 (1 year) to 0.27 (all time), reflecting how their relationship changes across market environments.

Compare stocks, funds, or ETFs

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Costco Wholesale Corporation

iShares Global Water UCITS ETF

Often compared with COST:
COST vs. WMTCOST vs. BRK-BCOST vs. BJCOST vs. TGTCOST vs. PGCOST vs. HDCOST vs. KO
Often compared with IH2O.L:
IH2O.L vs. GLGG.LIH2O.L vs. FIWIH2O.L vs. PHOIH2O.L vs. IVVIH2O.L vs. IWQU.LIH2O.L vs. SLVR.DEIH2O.L vs. VT

Return for Risk

COST vs. IH2O.L — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.
COST
COST Risk / Return Rank: 3737
Overall Rank
COST Sharpe Ratio Rank: 4040
Sharpe Ratio Rank
COST Sortino Ratio Rank: 3232
Sortino Ratio Rank
COST Omega Ratio Rank: 3232
Omega Ratio Rank
COST Calmar Ratio Rank: 4040
Calmar Ratio Rank
COST Martin Ratio Rank: 3939
Martin Ratio Rank
IH2O.L
IH2O.L Risk / Return Rank: 1414
Overall Rank
IH2O.L Sharpe Ratio Rank: 1515
Sharpe Ratio Rank
IH2O.L Sortino Ratio Rank: 1313
Sortino Ratio Rank
IH2O.L Omega Ratio Rank: 1414
Omega Ratio Rank
IH2O.L Calmar Ratio Rank: 1414
Calmar Ratio Rank
IH2O.L Martin Ratio Rank: 1515
Martin Ratio Rank
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. IH2O.L - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Costco Wholesale Corporation (COST) and iShares Global Water UCITS ETF (IH2O.L). 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.

COSTIH2O.LDifference
Sharpe ratioReturn per unit of total volatility
-0.08
0.18

-0.26

Sortino ratioReturn per unit of downside risk
0.02
0.34

-0.32

Omega ratioGain probability vs. loss probability

1.00

1.04

-0.04

Calmar ratioReturn relative to maximum drawdown

-0.10

0.22

-0.32

Martin ratioReturn relative to average drawdown

-0.22

0.54

-0.76

COST vs. IH2O.L - Sharpe Ratio Comparison

The current COST Sharpe Ratio is -0.08, which is lower than the IH2O.L Sharpe Ratio of 0.18. The chart below compares the historical Sharpe Ratios of COST and IH2O.L, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

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Drawdowns

COST vs. IH2O.L - Drawdown Comparison

The maximum COST drawdown since its inception was -53.39%, smaller than the maximum IH2O.L drawdown of -77.04%. Use the drawdown chart below to compare losses from any high point for COST and IH2O.L.

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Drawdown Indicators

COSTIH2O.LDifference

Max Drawdown

Largest peak-to-trough decline

-53.39%

-77.04%

+23.65%

Max Drawdown (1Y)

Largest decline over 1 year

-15.14%

-10.67%

-4.47%

Max Drawdown (3Y)

Largest decline over 3 years

-20.74%

-16.25%

-4.49%

Max Drawdown (5Y)

Largest decline over 5 years

-31.40%

-32.45%

+1.05%

Max Drawdown (10Y)

Largest decline over 10 years

-31.40%

-34.94%

+3.54%

Current Drawdown

Current decline from peak

-10.23%

-9.35%

-0.88%

Average Drawdown

Average peak-to-trough decline

-13.36%

-30.54%

+17.18%

Ulcer Index

Depth and duration of drawdowns from previous peaks

6.67%

4.41%

+2.26%

Volatility

COST vs. IH2O.L - Volatility Comparison

Costco Wholesale Corporation (COST) has a higher volatility of 7.44% compared to iShares Global Water UCITS ETF (IH2O.L) at 4.03%. This indicates that COST's price experiences larger fluctuations and is considered to be riskier than IH2O.L based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

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Volatility by Period

COSTIH2O.LDifference

Volatility (1M)

Calculated over the trailing 1-month period

7.44%

4.03%

+3.41%

Volatility (6M)

Calculated over the trailing 6-month period

14.53%

10.62%

+3.91%

Volatility (1Y)

Calculated over the trailing 1-year period

18.80%

13.41%

+5.39%

Volatility (5Y)

Calculated over the trailing 5-year period, annualized

22.72%

16.48%

+6.24%

Volatility (10Y)

Calculated over the trailing 10-year period, annualized

21.95%

16.61%

+5.34%

Dividends

COST vs. IH2O.L - Dividend Comparison

COST's dividend yield for the trailing twelve months is around 0.55%, less than IH2O.L's 1.43% yield.

PositionTTM20252024202320222021202020192018201720162015
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%
IH2O.L
iShares Global Water UCITS ETF		1.43%1.35%1.05%1.21%1.11%1.67%1.00%1.43%1.77%1.52%1.62%1.61%

Frequently Asked Questions

COST and IH2O.L have a correlation of 0.14, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

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