Comfort Systems USA Stock Slumps 0.62% on $320M Volume Ranked 365th Amid Manufacturing Sector Woes

Comfort Systems USA (FIX) closed on September 16, 2025, , , . The stock’s performance reflected a mix of sector-specific dynamics and broader market sentiment amid ongoing volatility in the industrial and consumer goods sectors.

Analysts noted that the decline aligned with broader trends in the manufacturing sector, where investor confidence has wavered due to delayed infrastructure project approvals and shifting demand patterns. FIX’s exposure to , including HVAC and energy solutions, has historically made it sensitive to regulatory shifts and supply chain adjustments, factors that appeared to weigh on the stock during the session.

To run this back-test accurately I need a few extra details: 1. Universe definition • “All U.S. listed common stocks” (≈ 6,000 names) • Only a specific index (e.g., S&P 500, , NASDAQ-100) • Something else? 2. Trade price • Buy at that day’s close and sell next day’s close (most common) • Buy at next day’s open and sell same day’s close (let me know if you prefer a different convention) 3. Weighting method • Equal weight (each of the 500 stocks gets 0.2 % of the portfolio) • Volume-weighted or another scheme? 4. Slippage / transaction costs • Ignore them for now • Apply a per-trade cost (specify). With those points clarified I can build the data-retrieval plan and run the back-test from 2022-01-03 through today (2025-09-16).