Correlation Analysis
BERKSHIRE HATHAWAY Class B vs Essex Property Trust, Inc
BRK.B vs ESS
-0.045
Near-zero 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
Essex Property Trust, Inc
↗ESS
Essex Property Trust owns a portfolio of 259 apartment communities with over 63,000 units. The company focuses on owning large, high-quality properties on the West Coast in the urban and suburban submarkets of Southern California, Northern California, and Seattle.
Market cap 16B · 1,689 employees
Time Series
Relative Performance
Who Moves First
ESS leads BRK.B by 6 days
ESS tends to move before BRK.B.
After testing 13 timing shifts, the strongest relationship was -0.051 (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
+0.512
14 periods · Return correlation when both series rose
Both Falling
+0.472
9 periods · Return correlation when both series fell
Diverging
-0.626
12 periods · Return correlation when series moved apart
R-Squared
0.2%
Share of variance in one series explained by the other.
Trend Agreement
64.6%
How often both series moved in the same direction period-to-period.
Overlap Quality
1,254
Deep shared window — 1,254 usable pairs.
Significance
n.s.
95% CI: [-0.100, 0.010]
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
Essex Property Trust, Inc
ESS
Market cap 16B · 1,689 employees
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
15
Estimated crossover points between normalized spreads.
Slope
-0.0214
Linear regression slope.
Intercept
278.8374
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
Saved 7 hours ago · ID: stock-brk-b-vs-stock-ess-daily