Correlation Analysis
BERKSHIRE HATHAWAY Class B vs MongoDB, Inc. Class A
BRK.B vs MDB
-0.239
Light 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
MongoDB, Inc. Class A
↗MDB
Founded in 2007, MongoDB is a vendor of a document-oriented database that accelerates development processes of new applications. Enterprise customers can choose between the fully managed offering, MongoDB Atlas, or the self-managed version, MongoDB Enterprise Advanced. MongoDB is a popular tool among developers, and its free Community Server has recorded over 500 million downloads since 2009.
Market cap 20.5B · 5,636 employees
Time Series
Relative Performance
Who Moves First
BRK.B leads MDB by 6 days
BRK.B tends to move before MDB.
After testing 13 timing shifts, the strongest relationship was -0.245 (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
+0.428
13 periods · Return correlation when both series rose
Both Falling
+0.800
8 periods · Return correlation when both series fell
Diverging
-0.613
14 periods · Return correlation when series moved apart
R-Squared
5.7%
Share of variance in one series explained by the other.
Trend Agreement
54.0%
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: [-0.290, -0.186]
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
MongoDB, Inc. Class A
MDB
Market cap 20.5B · 5,636 employees
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
23
Estimated crossover points between normalized spreads.
Slope
-0.2641
Linear regression slope.
Intercept
415.8029
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
Saved 6 hours ago · ID: stock-brk-b-vs-stock-mdb-daily