Correlation Analysis
Bank of New York Mellon Corporation vs BERKSHIRE HATHAWAY Class B
BK vs BRK.B
+0.844
Strong positive
When one moves up, the other tends to follow.
Bank of New York Mellon Corporation
↗BK
Bank of New York Mellon is a global investment company involved in managing and servicing financial assets throughout the investment lifecycle. The bank provides financial services for institutions, corporations, and individual investors, delivering investment management and services in 35 countries and more than 100 markets. BNY is the largest global custody bank in the world, with $59.3 trillion in under custody or administration (as of December 2025), and can act as a single point of contact for clients looking to create, trade, hold, manage, service, distribute, or restructure investments. BNY's asset-management division manages about $2.2 trillion in assets.
Market cap 85.1B · 48,100 employees
BERKSHIRE HATHAWAY Class B
↗BRK.B
Berkshire Hathaway is a holding company with a wide array of subsidiaries engaged in diverse activities. The firm's core business segment is insurance, run primarily through Geico, Berkshire Hathaway Reinsurance Group, and Berkshire Hathaway Primary Group. Berkshire has used the excess cash thrown off from its operations to acquire Burlington Northern Santa Fe (railroad), Berkshire Hathaway Energy (utilities and energy distributors), and the companies that make up its manufacturing, service, and retailing operations (which include Precision Castparts, Lubrizol, Clayton Homes, Marmon, and IMC/ISCAR). The conglomerate is unique in that it is run on a completely decentralized basis. Berkshire is expected to generate close to $375 billion in revenue in 2025.
Market cap 1T
Time Series
Relative Performance
Who Moves First
BRK.B leads BK by 6 days
BRK.B tends to move before BK.
After testing 13 timing shifts, the strongest relationship was +0.845 (they moved in the same direction).
Do They Crash Together?
Correlation by Market Regime
How these series behave when markets are rising, falling, or diverging. A correlation that holds in drawdowns is very different from one that only works in rallies.
Both Rising
-0.349
15 periods · Return correlation when both series rose
Both Falling
-0.246
6 periods · Return correlation when both series fell
Diverging
-0.844
14 periods · Return correlation when series moved apart
R-Squared
71.3%
Share of variance in one series explained by the other.
Trend Agreement
70.9%
How often both series moved in the same direction period-to-period.
Overlap Quality
1,254
Deep shared window — 1,254 usable pairs.
Significance
p < 0.001
95% CI: [0.827, 0.859]
Scatter
XY Regression
Pipeline
Data quality details
Pipeline
Data quality details
Pipeline Summary
1,254 paired data points survived the daily window.
Raw input
1,254
1,254
Normalized
1,254
1,254
Prepared
1,254
1,254
Aligned
1,254
1,254
Invalid removed
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
0
A: 0 / B: 0
Series A
Bank of New York Mellon Corporation
BK
Market cap 85.1B · 48,100 employees
Stock · 1,254 raw → 1,254 prepared
Series B
BERKSHIRE HATHAWAY Class B
BRK.B
Market cap 1T
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
13
Estimated crossover points between normalized spreads.
Slope
2.9931
Linear regression slope.
Intercept
186.4672
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
BK
Bank of New York Mellon Corporation
Highest
+0.969
JPMorgan Chase & Co.
JPM · 1,254 data points
Lowest
+0.507
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 6 hours ago · ID: stock-bk-vs-stock-brk-b-daily