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On October 8, 2025,
(COP) closed down 1.55% with a trading volume of $490 million, ranking 228th among stocks by dollar volume. The decline came amid mixed signals from operational updates and market dynamics affecting the energy sector.Analysts highlighted a temporary production disruption at the company’s Permian Basin operations due to unplanned maintenance at a key processing facility. While the company emphasized that the issue would not impact long-term production guidance, the short-term uncertainty weighed on investor sentiment. Additionally, a revised partnership agreement with a European energy firm to co-develop offshore wind projects was cited as a strategic pivot, though its immediate financial impact remains limited.
Market participants noted that COP’s performance was also influenced by broader oil price volatility driven by conflicting EIA inventory reports and speculative trading activity. The stock’s underperformance relative to peers underscored its sensitivity to near-term operational risks despite a strong balance sheet and dividend yield of 3.2%.
To run this back-test accurately I need to confirm a few practical details: 1. Universe • Which market(s) should the 500 stocks be drawn from (e.g., U.S.-listed equities on NYSE + NASDAQ, all global stocks, a specific index constituent list, etc.)? • If the tradable universe changes daily (due to IPOs, delistings, etc.), do we simply re-rank all available stocks each day by that day’s dollar volume? 2. Weighting & re-balancing • Should the portfolio be equal-weighted across the 500 names each day, or volume-weighted / market-cap-weighted? • Buy at that day’s close and sell at the next day’s close (Close→Close), or open→open, or another convention? 3. Transaction-cost assumptions • Should I include any slippage/commissions, or assume frictionless execution? 4. Data source preference • If you have a preferred data provider or specific symbol set (for example only liquid U.S. common stocks), please let me know. Once I have these details I can generate the daily selection list, create the one-day holding signals, and run the back-test from 2022-01-03 to the present.

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