X0508 4 2026-02-27 false 0001489393 LyondellBasell Industries N.V. LYB 0001949202 van der Laan Yvonne 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP, Circular & Low Carbon Sol false Class A Ordinary Shares 2026-02-27 4 F false 1052.00 57.52 D 12258.00 D Class A Ordinary Shares 2026-02-28 4 A false 12475.00 0.00 A 24733.00 D On February 27, 2026 the reporting person's restricted stock units automatically vested 2,146 shares. 1,052 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 5,690 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,400 granted on February 22, 2024 that vest on February 22, 2027; 2,145 granted on February 27, 2025 that vest on February 27, 2027 and 2,145 granted on February 27, 2025 that vest on February 27, 2028. Includes 18,165 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,400 granted on February 22, 2024 that vest on February 22, 2027; 2,145 granted on February 27, 2025 that vest on February 27, 2027 and 2,145 granted on February 27, 2025 that vest on February 27, 2028. The 12,475 RSUs reported on this Form 4 vest as follows: 4,159 vest on February 28, 2027, 4,158 vest on February 28, 2028 and 4,158 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03