SOFI's $2.86B Volume Surge Propels It to 35th in Market Activity Amid 7.94% Plunge

On October 10, 2025, SoFi Technologies (SOFI) saw its trading volume surge to $2.86 billion, a 51.62% increase from the previous day, ranking it 35th in market-wide activity. Despite the robust liquidity, the stock closed with a 7.94% decline, signaling heightened volatility amid mixed investor sentiment.

The sharp volume spike suggests intensified short-term trading activity, potentially driven by algorithmic strategies or institutional rebalancing. However, the decoupling of volume and price movement indicates a lack of consensus among market participants. Analysts noted that the heavy trading failed to translate into price support, raising questions about underlying demand sustainability.

Backtesting parameters for volume-based strategies remain under development, with key considerations including universe composition, weighting methodologies, and transaction cost assumptions. Finalizing these details will be critical to assessing the viability of volume-ranked trading approaches for SOFI or similar assets.

Backtest setup requires clarification on: (1) universe scope (e.g., NYSE/NASDAQ common stocks vs. S&P 500), (2) weighting schemes (equal-weight vs. dollar-volume), (3) cost assumptions, and (4) benchmark selection. Once defined, the test will evaluate daily volume ranks and generate one-day-holding signals from January 1, 2022, to the present.