Koppers Holdings closed at $39.64 on Nov 5, down 7.58%, 24.2% below its 52-week closing high. Volume of 164.7K shares was 1.16× its 20-day average (close to normal).
Split-adjusted performance: -9.7% over one month, -3.7% over six months, +40.4% over one year.
In the quarter ended Jun 30, 2026, revenue was $520.10M, up 3.0% from a year earlier, with a net margin of -28.4%.
Short interest was 739.6K shares at the Oct 15 settlement, down 7.7% from the prior report (4.2% of float, 4.8 days to cover).