SeriesMagCorrOverlapThrough
These move together about 56% of the time
Very strong positive
Strong enough to use as a signal — read the stability and regime notes below before relying on it.
Meta is the largest social media company in the world, boasting close to 4 billion monthly active users worldwide. The firm's "Family of Apps," its core business, consists of Facebook, Instagram, Messenger, and WhatsApp. End users can leverage these applications for a variety of different purposes, from keeping in touch with friends to following celebrities and running digital businesses for free. Meta packages customer data, gleaned from its application ecosystem and sells ads to digital advertisers. While the firm has been investing heavily in its Reality Labs business, it remains a very small part of Meta's overall sales.
Market cap 1.7T · 78,865 employees
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 i
What to Watch
Unusual right now
Recent correlation (-36%) is 2.8σ from the long-run average of +95% — pair is behaving differently than usual.
Holds across regimes
Correlation is similar when markets rise (+23%) and fall (+26%) — reliable in both directions.
Regime-dependent
The correlation has flipped sign across time windows — not reliable as a standalone signal.
Time Series
Time-Shifted Correlation
See how correlation changes when one series is offset in time. A taller bar at a non-zero shift means the two move together better when one leads the other — that's a potential lead/lag signal.
Correlation by shift
Click a bar to inspect. Range: -6 to 6 days.
Selected shift
No shift
Correlation at this shift
+95%
No shift — both series at their actual dates.
1,124 overlapping points at this shift
Time series with BERKSHIRE HATHAWAY Class B at original dates
Indexed to 100 at start
Deep Dive
Stability
How the correlation evolves over time. A stable line means the relationship is reliable; large swings signal regime-dependent behavior.
Corr
+95%
Pearson correlation
95% CI
+95% → +96%
Likely range
R²
91.1%
Variance explained
Trend agreement
56.0%
Same-direction moves
Significance
p < 0.001
Statistical confidence
Data points
1,124
Deep
Pipeline
Pipeline Summary
1,124 paired data points survived the daily window.
Raw input
1,124
1,255
Normalized
1,124
1,255
Prepared
1,124
1,255
Aligned
1,124
1,124
Invalid removed
Explore
The strongest positive and inverse pairs we’ve saved for each side of this comparison — good jumping-off points if this result raised a question.
Market cap 1T · 387,800 employees
Do They Crash Together?
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
+23%
94 periods · Return correlation when both series rose
Both Falling
+26%
74 periods · Return correlation when both series fell
Diverging
-54%
81 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
131
A: 0 / B: 131
Series A
Meta Platforms, Inc. Class A Common Stock
META
Market cap 1.7T · 78,865 employees
Stock · 1,124 raw → 1,124 prepared
Series B
BERKSHIRE HATHAWAY Class B
BRK.B
Market cap 1T · 387,800 employees
Stock · 1,255 raw → 1,255 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
7
Estimated crossover points between normalized spreads.
Slope
0.3352
Linear regression slope.
Intercept
259.9978
Linear regression intercept.
Saved 2 days ago · ID: stock:brk.b|stock:meta|5Y
BRK.B
BERKSHIRE HATHAWAY Class B
Strongest positive