Correlation Analysis
BERKSHIRE HATHAWAY Class B vs Freeport-McMoran Inc.
BRK.B vs FCX
+0.506
Moderate 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
Freeport-McMoran Inc.
↗FCX
Freeport-McMoRan owns stakes in 10 copper mines, led by its 49% ownership of the Grasberg copper and gold operations in Indonesia, 55% of the Cerro Verde mine in Peru, and 72% of Morenci in Arizona. It sold around 1.1 million metric tons of copper (its share) in 2025, making it the one of the world's largest copper miners by volume. It also sold about 530,000 ounces of gold, mostly from Grasberg, and 74 million pounds of molybdenum. It had about 25 years of copper reserves at the end of December 2025. We expect it to sell about 1.3 million metric tons of copper and 610,000 ounces of gold midcycle in 2030.
Market cap 87.7B · 29,000 employees
Time Series
Relative Performance
Who Moves First
in sync
BRK.B and FCX tend to move at the same time.
After testing 13 timing shifts, the strongest relationship was +0.506 (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
-0.022
14 periods · Return correlation when both series rose
Both Falling
+0.347
8 periods · Return correlation when both series fell
Diverging
-0.764
13 periods · Return correlation when series moved apart
R-Squared
25.6%
Share of variance in one series explained by the other.
Trend Agreement
61.6%
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: [0.463, 0.546]
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
Freeport-McMoran Inc.
FCX
Market cap 87.7B · 29,000 employees
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
1
Estimated crossover points between normalized spreads.
Slope
0.0426
Linear regression slope.
Intercept
24.9768
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
Saved 6 hours ago · ID: stock-brk-b-vs-stock-fcx-daily