Correlation Analysis
BERKSHIRE HATHAWAY Class B vs News Corporation Class B Common Stock
BRK.B vs NWS
+0.857
Very strong positive
When one moves up, the other tends to follow.
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
News Corporation Class B Common Stock
↗NWS
News Corporation is a diversified media conglomerate with big presence in the US, the UK, and Australia. Key mastheads include The Wall Street Journal, Barron's, New York Post, The Times, The Sun, The Australian, Herald Sun, and The Daily Telegraph. Its 61%-owned REA Group is the dominant property listings platform in Australia. In addition, it owns Harper Collins, one of the largest book publishers in the world, and has a sizable US digital property advertising business, Move. The 65% interest in Foxtel, the Australian pay-TV and streaming provider, was sold in April 2025. The sale to global sports streaming platform, DAZN, was struck at more than 7 times Foxtel's EBITDA.
Market cap 15.5B · 22,300 employees
Time Series
Relative Performance
Who Moves First
NWS leads BRK.B by 6 days
NWS tends to move before BRK.B.
After testing 13 timing shifts, the strongest relationship was +0.857 (they moved in the same direction).
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
+0.010
13 periods · Return correlation when both series rose
Both Falling
+0.187
7 periods · Return correlation when both series fell
Diverging
-0.506
15 periods · Return correlation when series moved apart
R-Squared
73.4%
Share of variance in one series explained by the other.
Trend Agreement
65.6%
How often both series moved in the same direction period-to-period.
Overlap Quality
1,254
Deep shared window — 1,254 usable pairs.
Significance
p < 0.001
95% CI: [0.841, 0.871]
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
News Corporation Class B Common Stock
NWS
Market cap 15.5B · 22,300 employees
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
0.0538
Linear regression slope.
Intercept
4.2480
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
NWS
News Corporation Class B Common Stock
Highest
+0.927
NetFlix Inc
NFLX · 1,254 data points
Lowest
+0.046
Johnson & Johnson
JNJ · 1,254 data points
Saved 6 hours ago · ID: stock-brk-b-vs-stock-nws-daily