One-month outperformance of 19.2 percentage points versus the S&P: Berkshire (BRK.B) posts its largest monthly relative advantage since 2010, second only to the 2008 financial crisis.

As the AI trade recedes and tech stocks wobble, one of the market's oldest "safe havens" has once again proven its worth. Berkshire Hathaway (BRK.B) has just recorded one of its most striking relative gains in more than a decade. How rare is the data: only three outperformances in 30 years In the past month through last Thursday, the conglomerate outperformed the S&P 500 (SP500) by 19.2 percentage pointsits largest rolling monthly relative advantage since 2010 and the fourth-largest gap in the past 30 years. Only the turmoil of the 2008 financial crisis produced a wider gap: that year Berkshire led the broad market by 29.6 percentage points. The divergence stems from the stark contrast in absolute performance: over the past month, Berkshire's stock rose 13.2%, hitting an all-time high, while the S&P 500 fell 3.7% over the same period. By Tuesday's close, the gap had narrowed slightly to 16.9 percentage points, but by records since comparable data began in 1996, this level remains extremely rare. In just half a year, offense and defense have swapped. As recently as May this year, Berkshire trailed the S&P 500 by 14.3 percentage pointsat a time when the market was immersed in AI euphoria, with the tech-heavy index leading the way while Berkshire, whose core consists of traditional operating businesses such as insurance, railroads and energy, appeared to lag. Why Berkshire: cash, operating businesses and "not betting on a single narrative" This rapid reversal highlights how quickly the market environment can turn in favor of the company's structural featuresa cash-rich balance sheet and a portfolio of mature operating businesses. The logic is not mysterious: when the market's focus of concern shifts from "can AI rise faster" to "can the massive debt behind AI infrastructure earn back its cost," the anchor of valuation returns from dreams to cash flow. Berkshire's enormous cash reserves, often criticized in bull markets as "inert assets dragging down returns," serve in an environment of shrinking risk appetite and widening credit spreads as both a buffer against volatility and ready "dry powder"the more panicked the market, the greater the option value of that cash. At the same time, earnings from its operating businessesBNSF Railway, energy, insurancecome from real-economy demand rather than the continuation of any single hot narrative. This week, volatility in AI-related assets, from chip stocks to computing-power suppliers, has surged sharplyand Berkshire's earnings structure has almost no direct exposure to that narrative. Placing the current gap in a 30-year dimension, it is second only to the 2008 financial crisisalso a period when "cash and certainty commanded a premium, while leverage and narrative assets were sold off." History seems to suggest a simple rule: Berkshire's excess returns are often not born in bull markets, but cashed in when the market relearns awe. It should be noted that the durability of such relative advantage depends heavily on the continuation of the market environment: if AI sentiment recovers and risk appetite returns, Berkshire's gap versus the broad market could narrow again, as it did on Tuesday. For investors, the 19.2 percentage points do not record that a company has become stronger, but that the market has repriced "certainty" itself.