X0508 4 2026-02-27 false 0001489393 LyondellBasell Industries N.V. LYB 0001964403 Conley Trisha L 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP, People and Culture false Class A Ordinary Shares 2026-02-27 4 F false 711.00 57.52 D 18698.00 D Class A Ordinary Shares 2026-02-28 4 A false 15068.00 0.00 A 33766.00 D On February 27, 2026 the reporting person's restricted stock units automatically vested 2,917 shares. 711 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 8,097 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 2,265 granted on February 22, 2024 that vest on February 22, 2027; 2,916 granted on February 27, 2025 that vest on February 27, 2027 and 2,916 granted on February 27, 2025 that vest on February 27, 2028. Includes 23,165 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 2,265 granted on February 22, 2024 that vest on February 22, 2027; 2,916 granted on February 27, 2025 that vest on February 27, 2027 and 2,916 granted on February 27, 2025 that vest on February 27, 2028. The 15,068 RSUs reported on this Form 4 vest as follows: 5,024 vest on February 28, 2027, 5,022 vest on February 28, 2028 and 5,022 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03