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Duolingo (DUOL) surged 8.53% on October 8, 2025, with a trading volume of $540 million—109.21% higher than the previous day—ranking it 206th in market activity. The stock’s performance followed a strategic update highlighting expanded language offerings and AI-driven personalized learning tools, which analysts noted could enhance user retention and attract new subscribers. The company also announced a partnership with a major global education platform, broadening its content library and reinforcing its competitive edge in the digital learning sector.
Recent earnings reports indicated a 30% year-over-year increase in monthly active users, driven by seasonal demand and successful marketing campaigns in emerging markets. However, the stock remains sensitive to macroeconomic concerns, particularly inflation-driven spending shifts in education technology. Investors appeared to balance these risks with optimism over Duolingo’s product roadmap, which includes a beta launch of a vocational skills platform targeting adult learners.
To run this strategy rigorously I’ll need to pin down a few implementation details that aren’t specified yet: 1. Universe of stocks • Should we consider all U.S. common stocks (NYSE + NASDAQ), or only a predefined group such as the Russell 3000 or S&P 500 constituents? • If you already have a list of tickers you want included, please let me know. 2. Execution convention • Buy at today’s close and sell at tomorrow’s close (using “close” prices), or buy at tomorrow’s open and sell at tomorrow’s close (requiring “open” prices)? • Equal-weight allocation across the 500 names each day – is that acceptable? 3. Frictions • Do you want to include transaction costs or assume frictionless trading? Once these details are confirmed, I can pull the necessary daily volume data, generate the daily entry/exit signals, and run the back-test from 2022-01-03 (first trading day of 2022) through today.

Hunt down the stocks with explosive trading volume.

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