Berkshire Hathaway A Slides to 485th in Liquidity as Trading Volume Dives 30.38% Amid Strategic Overhaul and Market Jitters

On October 2, 2025, Berkshire Hathaway A (BRK.A) closed with a 0.17% decline, marking its lowest price in recent sessions. The stock saw a trading volume of $0.24 billion, a 30.38% drop from the previous day, placing it 485th among listed equities in terms of liquidity. The underperformance followed a strategic shift in the conglomerate’s portfolio management approach, with analysts noting reduced activity in its insurance underwriting arm and a temporary pause in new industrial acquisitions.

Market participants attributed the muted trading activity to a broader caution in equity markets amid mixed macroeconomic signals. While Berkshire’s energy and rail segments reported stable cash flows, the lack of major capital allocations in its core holdings limited short-term momentum. Institutional investors also observed a slight rotation out of large-cap value stocks into sector-specific plays, a trend that may pressure BRK.A’s liquidity in the near term.

To run this back-test accurately I need to pin down a few practical details: Stock universe — Are we looking at all U.S. listed common shares (NYSE + NASDAQ), or a different market/universe? Entry / exit prices — Should we buy at that day’s close and sell at the next day’s close (typical EOD re-balance), or use the next day’s open for the exit? Weighting method — Equal-weight across the 500 names each day (most common for this type of test) – OK to proceed with that? Transaction costs / slippage — Should we ignore them (pure gross return), or apply a per-trade cost assumption? Once these points are confirmed I can generate the daily trade lists, build the 1-day-hold portfolio series from 2022-01-03 to today, and run the back-test statistics.