Berkshire Hathaway A Shares Surge 0.8 as $370M Volume Surges 55.76 to Rank 306th in U.S. Equity Volume Amid Buffett-led Investor Focus

On October 3, 2025, Berkshire Hathaway Class A (BRK.A) rose 0.80% to close at its daily high, with a trading volume of $370 million—up 55.76% from the prior day—ranking it 306th among U.S. equities. The surge in liquidity coincided with renewed investor focus on Warren Buffett’s conglomerate, though no material corporate announcements were reported during the period.

The stock’s performance was primarily driven by broader market sentiment rather than firm-specific catalysts. Analysts noted that Berkshire’s stable cash flow and diversified portfolio continue to attract long-term institutional investors. However, short-term volatility remains constrained by the absence of new strategic disclosures or earnings updates in the near term.

To set up an accurate, realistic back-test, key parameters require confirmation: the universe will include U.S. common stocks listed on NYSE and NASDAQ (excluding ADRs, ETFs, and preferreds). The 500 selected names will be equally weighted, rebalanced daily after rankings are determined. Trades will follow a T+1 close-to-close convention with standard transaction costs of 2 bps commission and 5 bps slippage. These settings will govern the back-test from January 3, 2022, to October 2, 2025.