X0508 4 2025-10-15 false 0001489393 LyondellBasell Industries N.V. LYB 0001948900 Campbell Tracey D 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP, Sustainability & Corp Aff false Class A Ordinary Shares 2025-10-15 4 F false 43.00 46.76 D 13114.36 D Class A Ordinary Shares 5401.00 I By Spouse On October 15, 2025 the reporting person's restricted stock units automatically vested 176 shares. 43 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 6,427 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,155 granted on February 23, 2023 that vest on February 23, 2026; 2,205 granted on February 22, 2024 of which 735 were deferred on February 22, 2025, 735 vest on February 22, 2026; 735 vest on February 22, 2027 and 3,067 granted on February 27, 2025 of which 1,023 vest on February 27, 2026, 1,022 vest on February 27, 2027 and 1,022 vest on February 27, 2028. ESPP purchase of 173.732955 shares for $63.36 per share were allocated on March 31, 2025. ESPP purchase of 76.665514 shares for $52.07 per share were allocated on June 30, 2025. /s/ Lara A. Mason, Attorney-in-Fact 2025-10-17