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Upstart (UPST) closed 2.84% lower on September 24, 2025, with a trading volume of $390 million, ranking 269th among stocks by volume that day. The decline followed a strategic shift in its AI-driven lending platform, which has sparked mixed market reactions regarding long-term profitability.
Analysts noted that the company's recent partnership with regional banks to expand credit underwriting capabilities introduced operational complexities. While this collaboration aims to diversify revenue streams, execution risks and integration challenges have tempered investor optimism. The stock's performance also reflects broader sector concerns about regulatory scrutiny in AI-based financial services.
Backtesting parameters for evaluating UPST's performance require precise implementation details. Key considerations include defining the market universe (U.S. listed stocks only), selecting volume metrics (share volume vs. dollar volume), portfolio weighting methods (equal-weight vs. volume-weighted), and rebalancing frequency. Execution assumptions such as closing price trading and slippage factors must also be specified. A synthetic price series will be generated to model a 500-stock portfolio, enabling accurate backtesting once all parameters are confirmed.

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