eBay Tumbles 1.75% as E-commerce Woes Weigh on 336th-Ranked Trading Volume of $370M

On October 10, 2025, eBay (EBAY) closed down 1.75% with a trading volume of $0.37 billion, ranking 336th in market activity for the day. The decline came amid mixed market sentiment and sector-specific pressures affecting e-commerce platforms. Analysts noted that the stock's performance reflected broader concerns over holiday shopping season expectations and competitive dynamics in the digital marketplace segment.

Recent developments highlighted in market commentary emphasized eBay's strategic position in the evolving e-commerce landscape. While the company has maintained its dominance in niche categories like collectibles and vintage items, investors remained cautious about macroeconomic headwinds and shifting consumer behavior. Regulatory scrutiny of online marketplaces continued to weigh on sentiment, though no direct actions against eBay were reported in the analyzed period.

Technical indicators showed limited short-term momentum, with the stock failing to break key resistance levels established in early 2025. Position adjustments by institutional investors were observed, though there was no consensus on directional bias. The broader tech sector's underperformance also contributed to the bearish bias for eBay, despite its relatively strong balance sheet and recurring revenue streams.

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1. Trading universe • U.S.-listed common stocks (excludes ADRs, ETFs, preferreds, etc.)? • Or a different market/universe?

2. Volume metric • Raw share volume, or dollar volume (price × shares)? • Ranking based on today’s volume and traded at the same-day close (so you hold overnight and exit next-day close), or based on yesterday’s volume and traded next-day open?

3. Slippage / transaction costs • Assume zero (pure signal) or add a cost per trade?

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5. Output granularity • Portfolio-level daily equity curve and standard performance stats? • Anything else (max drawdown, hit ratio, etc.)?

Once I have those points confirmed, I can set the parameters and proceed with the back-test.