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On October 9, 2025, Berkshire Hathaway Inc. , , . equities. The stock’s performance followed a mixed session in broader markets, though sector-specific catalysts and macroeconomic data had limited influence on its trajectory.
Analysts noted muted investor activity in the stock, with no material developments in the company’s core insurance or industrial segments reported during the period. Institutional trading patterns remained neutral, and no significant earnings revisions or executive announcements impacted sentiment. The decline aligned with broader defensive positioning in equities, though Berkshire’s underperformance relative to its historical volatility suggests position adjustments rather than fundamental concerns.
To run this back-test rigorously I need to clarify a few practical details: 1. Universe • Should the selection pool be all U.S.–listed common stocks (NYSE + NASDAQ + NYSE Arca)? • Or a narrower list (e.g., constituents of the Russell 3000 or S&P 500)? 2. Weighting & sizing • Do you want the portfolio equally weighted across the 500 names each day? • Or volume-weighted / value-weighted? 3. Transaction costs & slippage • Should we include an assumed commission/slippage per trade? If yes, what rate? 4. Data frequency • Is an end-of-day open-to-close test acceptable (buy at next-day open, liquidate at next-day close)? • Or do you want close-to-close (buy today at the close, exit tomorrow at the close)? 5. Benchmark • Any particular benchmark (e.g., SPX, SPY) you’d like shown alongside the strategy? Once we lock these down I can generate the daily rebalance signals, , and present full performance statistics and charts.

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