Correlation Analysis
Affirm Holdings, Inc. Class A Common Stock vs BERKSHIRE HATHAWAY Class B
AFRM vs BRK.B
+0.131
Weak positive
When one moves up, the other tends to follow.
Affirm Holdings, Inc. Class A Common Stock
↗AFRM
Founded in 2012, Affirm is a market leader in the buy-now, pay-later space with around $36 billion in transaction volume in fiscal 2025. Affirm offers both zero-interest financing, which is merchant subsidized, and interest-bearing loans, which function as personal loans that are approved on a per-transaction basis. Over 70% of Affirm's transaction volume comes from its interest-bearing loans, which also comprise the majority of its revenue. Affirm operates in the United States, which accounted for more than 95% of its revenue in 2025, but the firm has also expanded to Canada and the United Kingdom.
Market cap 16.1B · 2,206 employees
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
Time Series
Relative Performance
Who Moves First
BRK.B leads AFRM by 6 days
BRK.B tends to move before AFRM.
After testing 13 timing shifts, the strongest relationship was +0.134 (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
-0.247
12 periods · Return correlation when both series rose
Both Falling
+0.368
8 periods · Return correlation when both series fell
Diverging
-0.354
15 periods · Return correlation when series moved apart
R-Squared
1.7%
Share of variance in one series explained by the other.
Trend Agreement
58.7%
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: [0.077, 0.185]
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
Affirm Holdings, Inc. Class A Common Stock
AFRM
Market cap 16.1B · 2,206 employees
Stock · 1,254 raw → 1,254 prepared
Series B
BERKSHIRE HATHAWAY Class B
BRK.B
Market cap 1T
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
0.3621
Linear regression slope.
Intercept
362.2338
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
AFRM
Affirm Holdings, Inc. Class A Common Stock
Highest
+0.560
Tesla, Inc. Common Stock
TSLA · 1,254 data points
Lowest
-0.411
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 6 hours ago · ID: stock-afrm-vs-stock-brk-b-daily