X0508 4 2026-02-24 0001282637 NEWMARKET CORP NEU 0001913563 Xu Ting 330 SOUTH FOURTH STREET RICHMOND VA 23219 true false false false false Common Stock 2026-02-24 4 P false 400 619.21 A 929 D /s/ Anne-Marie Anderson (by Power of Attorney for Ting Xu) 2026-02-25