Correlation Analysis
American Water Works Company, Inc vs BERKSHIRE HATHAWAY Class B
AWK vs BRK.B
-0.544
Moderate inverse
When one moves up, the other tends to move down.
American Water Works Company, Inc
↗AWK
American Water Works is the largest investor-owned US water and wastewater utility, serving nearly 4 million customers in 14 states. It provides water and wastewater services to residential, commercial, and industrial customers and operates predominantly in regulated markets. The company's nonregulated business is water services for military bases, which operates under long-term contracts with regulated-like returns. The proposed Essential Utilities acquisition would add regulated water and wastewater utilities in Ohio, North Carolina, and Texas while increasing its presence in Illinois, Indiana, Pennsylvania, New Jersey, and Virginia.
Market cap 26.9B · 7,000 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
AWK leads BRK.B by 6 days
AWK tends to move before BRK.B.
After testing 13 timing shifts, the strongest relationship was -0.554 (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
+0.076
11 periods · Return correlation when both series rose
Both Falling
+0.572
7 periods · Return correlation when both series fell
Diverging
-0.583
17 periods · Return correlation when series moved apart
R-Squared
29.6%
Share of variance in one series explained by the other.
Trend Agreement
62.5%
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: [-0.582, -0.504]
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
American Water Works Company, Inc
AWK
Market cap 26.9B · 7,000 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
1
Estimated crossover points between normalized spreads.
Slope
-2.9539
Linear regression slope.
Intercept
804.9683
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
AWK
American Water Works Company, Inc
Highest
+0.053
Johnson & Johnson
JNJ · 1,254 data points
Lowest
-0.720
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 6 hours ago · ID: stock-awk-vs-stock-brk-b-daily