X0508 4 2026-02-27 false 0001489393 LyondellBasell Industries N.V. LYB 0002012815 Ledet Aaron J 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP, I&D & Supply Chain false Class A Ordinary Shares 2026-02-27 4 F false 609.00 57.52 D 14466.5326 D Class A Ordinary Shares 2026-02-28 4 A false 17247.00 0.00 A 31713.5326 D On February 27, 2026 the reporting person's restricted stock units automatically vested 2,497 shares. 609 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 6,226 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,232 granted on February 22, 2024 that vest on February 22, 2027; 2,497 granted on February 27, 2025 that vest on February 26, 2027 and 2,497 granted on February 27, 2025 that vest on February 26, 2028. Includes 23,473 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,232 granted on February 22, 2024 that vest on February 22, 2027; 2,497 granted on February 27, 2025 that vest on February 26, 2027 and 2,497 granted on February 27, 2025 that vest on February 26, 2028. The 17,247 RSUs reported on this Form 4 vest as follows: 5,749 vest on February 28, 2027, 5,749 vest on February 28, 2028 and 5,749 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03