X0508 4 2026-02-27 false 0001489393 LyondellBasell Industries N.V. LYB 0001634184 Kaplan Jeffrey A 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP and General Counsel false Class A Ordinary Shares 2026-02-27 4 F false 1000.00 57.52 D 85471.00 D Class A Ordinary Shares 2026-02-28 4 A false 21203.00 0.00 A 106674.00 D On February 27, 2026 the reporting person's restricted stock units automatically vested 4,105 shares. 1,000 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 11,424 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 3,218 granted on February 22, 2024 that vest on February 22, 2027; 4,103 granted on February 27, 2025 that vest on February 27, 2027 and 4,103 granted on February 27, 2025 that vest on February 27, 2028. Includes 32,627 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 3,218 granted on February 22, 2024 that vest on February 22, 2027; 4,103 granted on February 27, 2025 that vest on February 27, 2027 and 4,103 granted on February 27, 2025 that vest on February 27, 2028. The 21,203 RSUs reported on this Form 4 vest as follows: 7,069 vest on February 28, 2027, 7,067 vest on February 28, 2028 and 7,067 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03