PCT −76.7%. DuPont de Nemours +63.9%, DOW +36.7%, Albemarle +3.0%, Eastman Chemical +1.7%. Weekly closes, Oct 17, 2025 = 100, log scale.

End-of-day closes (Databento EOD), the last close of each week. The four peers are the largest US-listed companies by market value in PCT’s SEC industry (Plastic Materials, Synth Resins & Nonvulcan Elastomers) with a year of closes. It shows what the closes did; a move here is not a cause, a forecast or a call.