The Trade Desk's 3.17% Plunge as Volume Drops to 99th

On September 18, 2025, , , which ranked it 99th among all stocks in the market. The drop marked a significant reversal from recent momentum, with liquidity conditions tightening as the stock’s market capitalization dipped below $50 billion by midday.

Analysts attributed the selloff to renewed scrutiny over the company’s Q3 guidance, . Short-term traders exacerbated the decline through algorithmic unwinding of long positions, . Market participants noted the stock’s sensitivity to macroeconomic signals, with bond yield volatility amplifying risk-off sentiment in the digital advertising sector.

For the back-test setup: The framework requires defining market universe parameters, including whether to use U.S.-listed stocks across NYSE, NASDAQ, and NYSE Arca. Volume metrics must clarify whether to rank by share volume or dollar volume. Position allocation rules—such as equal-weight rebalancing of 500 positions daily—and cost assumptions for transaction fees or slippage must also be specified. A benchmark index, such as the , can be added for comparative analysis. Once these parameters are finalized, the back-test execution can proceed with data retrieval and performance evaluation.