X0508 4 2026-02-05 0001282637 NEWMARKET CORP NEU 0001627976 Paliotti Brian D 330 SOUTH FOURTH STREET RICHMOND VA 23219 false true false false President Afton Chemical Corp false Common Stock 2026-02-05 4 A false 535 0.00 A 3410 D Common Stock 2026-02-05 4 F false 171 714.88 D 3239 D Common Stock 637.37 I NewMarket Savings Plan On February 5, 2026, the Compensation Committee certified attainment of the performance goals for certain performance-based restricted stock awards ("Performance Stock"). The Performance Stock settled with shares of common stock. Shares withheld by the Company to satisfy tax withholding obligations related to the Performance Stock that vested on February 5, 2026. The increase in shares is due to periodic purchases by the Plan Trustee pursuant to the Plan. /s/ Anne-Marie Anderson (by Power of Attorney for Brian D. Paliotti) 2026-02-09