CBK.DE vs. BRK-B

Last updated Jun 4, 2026

CBK.DE (Commerzbank AG) and BRK-B (Berkshire Hathaway Inc.) are both stocks. Both are in the Financial Services sector — CBK.DE in Banks - Regional, BRK-B in Insurance - Diversified. Over the past 10 years, CBK.DE returned 19.67%/yr vs 12.56%/yr for BRK-B. At a 0.25 correlation, their price movements are largely independent.

Performance

CBK.DE vs. BRK-B - Performance Comparison

The chart below illustrates the hypothetical performance of a €10,000 investment in Commerzbank AG (CBK.DE) and Berkshire Hathaway Inc. (BRK-B). The values are adjusted to include any dividend payments, if applicable.

Different Trading Currencies

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

Returns By Period

In the year-to-date period, CBK.DE achieves a 3.94% return, which is significantly higher than BRK-B's -5.24% return. Over the past 10 years, CBK.DE has outperformed BRK-B with an annualized return of 19.67%, while BRK-B has yielded a comparatively lower 12.56% annualized return.

CBK.DE

• 1D: -2.04%
• 1M: 10.29%
• YTD: 3.94%
• 6M: 11.74%
• 1Y: 39.43%
• 3Y*: 60.36%
• 5Y*: 42.86%
• 10Y*: 19.67%

BRK-B

• 1D: 0.00%
• 1M: 1.18%
• YTD: -5.24%
• 6M: -6.02%
• 1Y: -7.33%
• 3Y*: 9.64%
• 5Y*: 11.02%
• 10Y*: 12.56%

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

CBK.DE vs. BRK-B - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CBK.DE Commerzbank AG	3.94%	135.54%	49.90%	24.42%	32.10%	27.02%	1.79%	-1.84%	-53.75%	72.58%
BRK-B Berkshire Hathaway Inc.	-4.29%	-2.27%	35.48%	12.00%	9.71%	38.60%	-6.07%	13.44%	7.84%	6.68%

Correlation

The correlation between CBK.DE and BRK-B 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 (3Y) Calculated over the trailing 3-year period	0.03
Correlation (5Y) Calculated over the trailing 5-year period	0.11
Correlation (10Y) Calculated over the trailing 10-year period	0.23
Correlation (All Time) Calculated using the full available price history since Aug 27, 2007	0.25

Over the past year, the correlation between CBK.DE and BRK-B has dropped to 0.03 - well below their long-term average of 0.25, suggesting their price drivers have been diverging.

Return for Risk

CBK.DE vs. BRK-B — Risk / Return Rank

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

CBK.DE

CBK.DE Risk / Return Rank: 69
CBK.DE Sharpe Ratio Rank: 72
CBK.DE Sortino Ratio Rank: 67
CBK.DE Omega Ratio Rank: 64
CBK.DE Calmar Ratio Rank: 72
CBK.DE Martin Ratio Rank: 69

BRK-B

BRK-B Risk / Return Rank: 23
BRK-B Sharpe Ratio Rank: 27
BRK-B Sortino Ratio Rank: 22
BRK-B Omega Ratio Rank: 23
BRK-B Calmar Ratio Rank: 24
BRK-B Martin Ratio Rank: 20

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.

CBK.DE vs. BRK-B - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Commerzbank AG (CBK.DE) and Berkshire Hathaway Inc. (BRK-B). 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.

	CBK.DE	BRK-B	Difference
Sharpe ratio Return per unit of total volatility	1.03	-0.49	+1.52
Sortino ratio Return per unit of downside risk	1.61	-0.58	+2.19
Omega ratio Gain probability vs. loss probability	1.19	0.93	+0.26
Calmar ratio Return relative to maximum drawdown	1.79	-0.67	+2.46
Martin ratio Return relative to average drawdown	3.58	-1.39	+4.97
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CBK.DE vs. BRK-B - Sharpe Ratio Comparison

The current CBK.DE Sharpe Ratio is 1.03, which is higher than the BRK-B Sharpe Ratio of -0.49. The chart below compares the historical Sharpe Ratios of CBK.DE and BRK-B, 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

	CBK.DE	BRK-B	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.03	-0.49	+1.52
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	1.06	0.64	+0.42
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.47	0.63	-0.16
Sharpe Ratio (All Time) Calculated using the full available price history	-0.03	0.49	-0.52

Drawdowns

CBK.DE vs. BRK-B - Drawdown Comparison

The maximum CBK.DE drawdown since its inception was -98.50%, which is greater than BRK-B's maximum drawdown of -45.91%. Use the drawdown chart below to compare losses from any high point for CBK.DE and BRK-B.

Drawdown Indicators

	CBK.DE	BRK-B	Difference
Max Drawdown Largest peak-to-trough decline	-98.50%	-45.91%	-52.59%
Max Drawdown (1Y) Largest decline over 1 year	-21.91%	-11.04%	-10.87%
Max Drawdown (3Y) Largest decline over 3 years	-21.91%	-20.62%	-1.29%
Max Drawdown (5Y) Largest decline over 5 years	-38.73%	-22.31%	-16.42%
Max Drawdown (10Y) Largest decline over 10 years	-77.53%	-28.74%	-48.79%
Current Drawdown Current decline from peak	-78.46%	-18.33%	-60.13%
Average Drawdown Average peak-to-trough decline	-64.10%	-9.72%	-54.38%
Ulcer Index Depth and duration of drawdowns from previous peaks	10.99%	5.55%	+5.44%

Volatility

CBK.DE vs. BRK-B - Volatility Comparison

Commerzbank AG (CBK.DE) has a higher volatility of 8.09% compared to Berkshire Hathaway Inc. (BRK-B) at 3.64%. This indicates that CBK.DE's price experiences larger fluctuations and is considered to be riskier than BRK-B based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CBK.DE	BRK-B	Difference
Volatility (1M) Calculated over the trailing 1-month period	8.09%	3.64%	+4.45%
Volatility (6M) Calculated over the trailing 6-month period	27.05%	11.18%	+15.87%
Volatility (1Y) Calculated over the trailing 1-year period	38.14%	14.99%	+23.15%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	39.96%	17.37%	+22.59%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	41.65%	20.09%	+21.56%

Dividends

CBK.DE vs. BRK-B - Dividend Comparison

CBK.DE's dividend yield for the trailing twelve months is around 3.02%, while BRK-B has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
BRK-B Berkshire Hathaway Inc.	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
CBK.DE Commerzbank AG	3.02%	1.80%	2.23%	1.86%	0.00%	0.00%	3.80%	3.63%	0.00%	0.00%	2.76%

Financials

Frequently Asked Questions

Can I hold both CBK.DE and BRK-B in my portfolio?

CBK.DE and BRK-B 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.