Correlation Analysis
BERKSHIRE HATHAWAY Class B vs PNC Financial Services Group
BRK.B vs PNC
+0.312
Light positive
When one moves up, the other tends to follow.
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
PNC Financial Services Group
↗PNC
PNC Financial is one of the three super-regional banks in the US, with around $574 billion in total assets at the end of Dec. 30, 2025. Headquartered in Pittsburgh, Pennsylvania, PNC Financial has a coast-to-coast branch network, with a strong presence in the US Midwest and Northeast. It closed its acquisition of FirstBank in January 2026, which added around $26 billion in assets to its balance sheet, and PNC is currently expanding in the Southern and Western regions of the US. The bank provides a diversified set of financial services in retail banking, commercial banking, card and treasury management, asset management, and investment banking. PNC derived around 38% of revenue from fee income and 62% from net interest income in 2025.
Market cap 86B · 55,333 employees
Time Series
Relative Performance
Who Moves First
in sync
BRK.B and PNC tend to move at the same time.
After testing 13 timing shifts, the strongest relationship was +0.312 (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
-0.031
14 periods · Return correlation when both series rose
Both Falling
-0.730
8 periods · Return correlation when both series fell
Diverging
-0.643
13 periods · Return correlation when series moved apart
R-Squared
9.7%
Share of variance in one series explained by the other.
Trend Agreement
72.0%
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: [0.261, 0.361]
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
BERKSHIRE HATHAWAY Class B
BRK.B
Market cap 1T
Stock · 1,254 raw → 1,254 prepared
Series B
PNC Financial Services Group
PNC
Market cap 86B · 55,333 employees
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
11
Estimated crossover points between normalized spreads.
Slope
0.1055
Linear regression slope.
Intercept
132.2163
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
BRK.B
BERKSHIRE HATHAWAY Class B
Highest
+0.968
Republic Services Inc.
RSG · 1,254 data points
Lowest
-0.918
United Parcel Service, Inc. Class B
UPS · 1,254 data points
PNC
PNC Financial Services Group
Highest
+0.656
Amazon.Com Inc
AMZN · 1,254 data points
Lowest
-0.116
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 6 hours ago · ID: stock-brk-b-vs-stock-pnc-daily