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On September 26, 2025,
(PSX) traded with a volume of $0.40 billion, representing a 44.37% decline from the previous day's activity. The stock closed up 0.27%, securing a modest gain despite the significant drop in trading liquidity. Its volume ranked 264th among all listed equities for the session.Market participants observed muted trading interest in the energy infrastructure giant, with the volume contraction suggesting reduced short-term speculative activity. Analysts noted the divergence between price performance and trading dynamics, indicating potential consolidation in the near term. The stock's resilience against broader market volatility was attributed to its defensive positioning in the energy sector.
To set up the back-test properly, several implementation details require clarification: the universe definition (e.g., all U.S. stocks or a subset), execution methodology (close-to-close vs. open-to-close), weighting scheme (equal-weight vs. volume-proportional), and transaction cost assumptions. These parameters will directly influence the accuracy of the historical performance simulation. Once finalized, the back-test framework can be executed to validate the strategy's robustness.

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