Correlation Analysis
BERKSHIRE HATHAWAY Class B vs General Mills, Inc.
BRK.B vs GIS
-0.610
Moderate inverse
When one moves up, the other tends to move down.
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
General Mills, Inc.
↗GIS
General Mills is a global packaged-food company that produces snacks, cereal, convenient meals, dough, baking mixes and ingredients, pet food, and superpremium ice cream. Its largest brands are Nature Valley, Cheerios, Old El Paso, Pillsbury, Betty Crocker, Blue Buffalo, and Haagen-Dazs. In fiscal 2025, 81% of its revenue was derived from the United States, although the company also operates in Canada, Europe, Australia, Asia, and Latin America. Although most of General Mills' products are sold through retail stores to consumers, the company also sells products to the foodservice channel and the commercial baking industry.
Market cap 20.1B · 33,000 employees
Time Series
Relative Performance
Who Moves First
BRK.B leads GIS by 6 days
BRK.B tends to move before GIS.
After testing 13 timing shifts, the strongest relationship was -0.624 (they moved in opposite directions).
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
+0.105
13 periods · Return correlation when both series rose
Both Falling
-0.052
10 periods · Return correlation when both series fell
Diverging
-0.450
12 periods · Return correlation when series moved apart
R-Squared
37.3%
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: [-0.644, -0.574]
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
General Mills, Inc.
GIS
Market cap 20.1B · 33,000 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
-0.0807
Linear regression slope.
Intercept
95.8554
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
Saved 9 hours ago · ID: stock-brk-b-vs-stock-gis-daily