Quanta Services closed at $509.06 on Nov 5, down 12.30%, 35.2% below its 52-week closing high. Volume of 4.9M shares was 3.47× its 20-day average (well above normal).
Split-adjusted performance: -27.4% over one month, -32.2% over six months, +16.0% over one year.
In the quarter ended Sep 30, 2026, revenue was $12.01B, up 57.4% from a year earlier, with a net margin of 5.8%.
Short interest was 3.5M shares at the Oct 15 settlement, up 8.2% from the prior report (2.3% of float, 3.5 days to cover).