Aon's $740M Volume Surge Propels It to 242nd in U.S. Rankings Despite 0.41% Slump

On September 19, 2025, , , ranking it 242nd among U.S. equities. Despite the surge in liquidity, .

The stock’s performance was influenced by evolving market dynamics in the risk management sector. Analysts noted that Aon’s trading volume spike reflected heightened institutional activity amid strategic positioning ahead of Q3 earnings. However, broader market volatility and macroeconomic uncertainty tempered investor enthusiasm for cyclical plays like Aon, contributing to the modest decline.

Technical indicators showed mixed signals. The stock failed to break above key resistance levels, while short-term momentum indicators pointed to oversold conditions. Market participants remained cautious, balancing optimism about Aon’s long-term growth potential with near-term macroeconomic headwinds such as and shifting regulatory landscapes.

To run this back-test rigorously I need to nail down a few practical details and assumptions: Universe—Do you mean all U.S.–listed equities (NYSE + NASDAQ + AMEX)? Or a pre-defined index family (e.g., Russell 3000)? Ranking rule—Rank stocks by the most recent completed trading day’s total share volume (to avoid look-ahead bias)? Or by today’s intraday volume snapshot? Trade mechanics—Entry: buy at today’s close, then exit at tomorrow’s close (a 1-day holding period)? Or buy at tomorrow’s open and sell at tomorrow’s close? Any transaction-cost assumption? Output—Aggregate portfolio return curve & key stats (CAGR, vol, max drawdown, Sharpe)? Anything else? A quick confirmation will let me pull the correct data and run the back-test for 2022-01-03 through today.