X0609 4 2026-04-15 false 0001489393 LyondellBasell Industries N.V. LYB 0002056904 Izquierdo Sabido Agustin true 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP & Chief Financial Officer false Class A Ordinary Shares 2026-04-15 4 F false 45.00 73.13 D 33499.00 D On April 15, 2026 the reporting person's restricted stock units automatically vested 182 shares. 45 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Represents 26,216 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 242 granted on February 22, 2024 that vest on February 22, 2027; 182 granted on April 15, 2024 that vest on April 15, 2027; 2,817 granted on February 27, 2025 that vest on February 27, 2027; 2,817 granted on February 27, 2025 that vest on February 27, 2028; 6,720 granted on February 28, 2026 that vest on February 28, 2027, 6,719 granted on February 28, 2026 that vest on February 28, 2028 and 6,719 granted on February 28, 2026 that vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-04-17