R3NK.DE vs. COST

Last updated Jun 5, 2026

R3NK.DE (RENK Group AG) and COST (Costco Wholesale Corporation) are both stocks. R3NK.DE operates in Aerospace & Defense (Industrials), while COST operates in Discount Stores (Consumer Defensive). Over the past year, R3NK.DE returned -36.42% vs -8.58% for COST. At a 0.05 correlation, their price movements are largely independent.

Performance

R3NK.DE vs. COST - Performance Comparison

The chart below illustrates the hypothetical performance of a €10,000 investment in RENK Group AG (R3NK.DE) and Costco Wholesale Corporation (COST). The values are adjusted to include any dividend payments, if applicable.

Different Trading Currencies

R3NK.DE is traded in EUR, while COST is traded in USD. To make them comparable, the COST values have been converted to EUR using the latest available exchange rates.

Returns By Period

In the year-to-date period, R3NK.DE achieves a -4.46% return, which is significantly lower than COST's 14.36% return.

R3NK.DE

• 1D: -0.23%
• 1M: -7.29%
• YTD: -4.46%
• 6M: 3.59%
• 1Y: -36.42%
• 3Y*: —
• 5Y*: —
• 10Y*: —

COST

• 1D: 0.95%
• 1M: -3.70%
• YTD: 14.36%
• 6M: 9.14%
• 1Y: -8.58%
• 3Y*: 21.67%
• 5Y*: 22.64%
• 10Y*: 22.16%

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

R3NK.DE vs. COST - Yearly Performance Comparison

	2026 (YTD)	2025	2024
R3NK.DE RENK Group AG	-4.46%	193.99%	-5.61%
COST Costco Wholesale Corporation	14.36%	-16.62%	33.03%

Correlation

The correlation between R3NK.DE and COST is -0.03, 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	-0.03
Correlation (All Time) Calculated using the full available price history since Feb 8, 2024	0.05

Return for Risk

R3NK.DE vs. COST — Risk / Return Rank

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

R3NK.DE

R3NK.DE Risk / Return Rank: 15
R3NK.DE Sharpe Ratio Rank: 13
R3NK.DE Sortino Ratio Rank: 15
R3NK.DE Omega Ratio Rank: 16
R3NK.DE Calmar Ratio Rank: 15
R3NK.DE Martin Ratio Rank: 17

COST

COST Risk / Return Rank: 24
COST Sharpe Ratio Rank: 26
COST Sortino Ratio Rank: 22
COST Omega Ratio Rank: 23
COST Calmar Ratio Rank: 27
COST Martin Ratio Rank: 22

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.

R3NK.DE vs. COST - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for RENK Group AG (R3NK.DE) 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.

	R3NK.DE	COST	Difference
Sharpe ratio: Return per unit of total volatility	-0.67	-0.42	-0.25
Sortino ratio: Return per unit of downside risk	-0.75	-0.46	-0.29
Omega ratio: Gain probability vs. loss probability	0.91	0.95	-0.03
Calmar ratio: Return relative to maximum drawdown	-0.72	-0.46	-0.26
Martin ratio: Return relative to average drawdown	-1.15	-0.98	-0.17
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

R3NK.DE vs. COST - Sharpe Ratio Comparison

The current R3NK.DE Sharpe Ratio is -0.67, which is lower than the COST Sharpe Ratio of -0.42. The chart below compares the historical Sharpe Ratios of R3NK.DE 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.

Sharpe Ratios by Period

	R3NK.DE	COST	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-0.67	-0.42	-0.25
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.98	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.98	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.86	0.83	+0.03

Drawdowns

R3NK.DE vs. COST - Drawdown Comparison

The maximum R3NK.DE drawdown since its inception was -50.86%, which is greater than COST's maximum drawdown of -38.85%. Use the drawdown chart below to compare losses from any high point for R3NK.DE and COST.

Drawdown Indicators

	R3NK.DE	COST	Difference
Max Drawdown Largest peak-to-trough decline	-50.86%	-38.85%	-12.01%
Max Drawdown (1Y) Largest decline over 1 year	-50.57%	-18.64%	-31.93%
Max Drawdown (3Y) Largest decline over 3 years	—	-29.57%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-29.57%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-29.57%	—
Current Drawdown Current decline from peak	-42.07%	-18.19%	-23.88%
Average Drawdown Average peak-to-trough decline	-27.26%	-8.13%	-19.13%
Ulcer Index Depth and duration of drawdowns from previous peaks	30.82%	11.31%	+19.51%

Volatility

R3NK.DE vs. COST - Volatility Comparison

RENK Group AG (R3NK.DE) has a higher volatility of 18.12% compared to Costco Wholesale Corporation (COST) at 8.72%. This indicates that R3NK.DE's price experiences larger fluctuations and is considered to be riskier than COST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	R3NK.DE	COST	Difference
Volatility (1M) Calculated over the trailing 1-month period	18.12%	8.72%	+9.40%
Volatility (6M) Calculated over the trailing 6-month period	38.08%	15.83%	+22.25%
Volatility (1Y) Calculated over the trailing 1-year period	54.00%	20.42%	+33.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	60.67%	23.10%	+37.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	60.67%	22.68%	+37.99%

Dividends

R3NK.DE vs. COST - Dividend Comparison

R3NK.DE's dividend yield for the trailing twelve months is around 0.82%, 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%
R3NK.DE RENK Group AG	0.82%	0.78%	1.64%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Financials

Frequently Asked Questions

Can I hold both R3NK.DE and COST in my portfolio?

R3NK.DE and COST have a correlation of -0.03, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.