Correlation Analysis
BERKSHIRE HATHAWAY Class B vs Nextpower Inc. Class A Common Stock
BRK.B vs NXT
+0.550
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
Nextpower Inc. Class A Common Stock
↗NXT
Nextpower (and its subsidiaries) is a leading provider of intelligent, integrated solar tracker and software solutions used in utility-scale and distributed generation solar projects around the world. Nextpower's products enable solar panels in utility-scale power plants to follow the sun's movement across the sky and optimize plant performance. Nextpower has operations in the United States, Mexico, Spain and other countries in Europe, India, Australia, the Middle East, Africa, and Brazil.
Market cap 16B · 1,300 employees
Time Series
Relative Performance
Who Moves First
BRK.B leads NXT by 6 days
BRK.B tends to move before NXT.
After testing 13 timing shifts, the strongest relationship was +0.551 (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
+0.619
12 periods · Return correlation when both series rose
Both Falling
N/A
3 periods · Return correlation when both series fell
Diverging
-0.673
20 periods · Return correlation when series moved apart
R-Squared
30.3%
Share of variance in one series explained by the other.
Trend Agreement
54.4%
How often both series moved in the same direction period-to-period.
Overlap Quality
791
Deep shared window — 791 usable pairs.
Significance
p < 0.001
95% CI: [0.500, 0.597]
Scatter
XY Regression
Pipeline
Data quality details
Pipeline
Data quality details
Pipeline Summary
791 paired data points survived the daily window.
Raw input
1,254
791
Normalized
1,254
791
Prepared
1,254
791
Aligned
791
791
Invalid removed
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
463
A: 463 / B: 0
Series A
BERKSHIRE HATHAWAY Class B
BRK.B
Market cap 1T
Stock · 1,254 raw → 1,254 prepared
Series B
Nextpower Inc. Class A Common Stock
NXT
Market cap 16B · 1,300 employees
Stock · 791 raw → 791 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
14
Estimated crossover points between normalized spreads.
Slope
0.1906
Linear regression slope.
Intercept
-27.5882
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
NXT
Nextpower Inc. Class A Common Stock
Highest
+0.932
Micron Technology, Inc.
MU · 791 data points
Lowest
+0.504
Costco Wholesale Corp
COST · 791 data points
Saved 6 hours ago · ID: stock-brk-b-vs-stock-nxt-daily