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On October 10, 2025,
(CMCSA) closed with a 2.06% decline, trading with a volume of $0.68 billion, ranking 194th in market activity. The drop followed a mixed earnings report from the media and broadband giant, which highlighted slowing subscriber growth in its Xfinity service and underperforming advertising revenue in its cable networks segment. Analysts noted the stock's weakness was exacerbated by broader market concerns over rising interest rates and sector-specific pressures from streaming competitors.Investor sentiment was further dampened by management's cautious guidance for the fourth quarter, citing persistent inflationary costs and lower consumer spending on discretionary services. While the company reaffirmed its dividend policy, the lack of aggressive capital allocation plans failed to reassure shareholders. Technical indicators showed the stock testing key support levels below $35, with short-term momentum indicators pointing to potential further downside in the near term.
To run this back-test accurately I need a few extra details: 1. Market universe • Do you want the U.S. stock market (NYSE + NASDAQ), or a different exchange/universe? 2. Trade-price convention • Buy at each day’s close and sell at the next day’s close (T+1 close-to-close) • Buy at the next day’s open and sell at the same day’s close (intraday) • Something else? 3. Transaction costs / slippage • Should I include any assumptions (e.g., 2 bp each side)? Once I have those points I can build the daily “Top-500-by-volume” lists, generate the 1-day holding signals, and run the back-test from 2022-01-03 through today.

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