Correlation Analysis
BERKSHIRE HATHAWAY Class B vs Zoom Communications, Inc. Class A Common Stock
BRK.B vs ZM
-0.493
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
Zoom Communications, Inc. Class A Common Stock
↗ZM
Zoom Communications provides a video-first communications platform that connects people through frictionless video, voice, chat, and content sharing. The company's cloud-native platform enables video experiences and connects users across various devices and locations in a single meeting. Zoom has launched a variety of communications-related solutions, including Zoom Phone and Zoom Contact Center. The firm was founded in 2011 and serves companies of all sizes from all industries around the world.
Market cap 24.4B · 7,438 employees
Time Series
Relative Performance
Who Moves First
ZM leads BRK.B by 6 days
ZM tends to move before BRK.B.
After testing 13 timing shifts, the strongest relationship was -0.495 (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
-0.240
12 periods · Return correlation when both series rose
Both Falling
-0.566
8 periods · Return correlation when both series fell
Diverging
-0.310
15 periods · Return correlation when series moved apart
R-Squared
24.3%
Share of variance in one series explained by the other.
Trend Agreement
55.3%
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: [-0.533, -0.449]
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
Zoom Communications, Inc. Class A Common Stock
ZM
Market cap 24.4B · 7,438 employees
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
7
Estimated crossover points between normalized spreads.
Slope
-0.4914
Linear regression slope.
Intercept
299.1654
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
ZM
Zoom Communications, Inc. Class A Common Stock
Highest
+0.034
Amazon.Com Inc
AMZN · 1,254 data points
Lowest
-0.804
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 7 hours ago · ID: stock-brk-b-vs-stock-zm-daily