0001282637 2026-08-13 2026-08-13 0001282637 stpr:VA 2026-08-13 2026-08-13 NEWMARKET CORP false 0001282637 8-K 2026-08-13 VA 1-32190 20-0812170 330 South Fourth Street Richmond VA 23219 (804) 788-5000 false false false false Common Stock, without par value NEU NYSE false