X0508 4 2026-02-27 false 0001489393 LyondellBasell Industries N.V. LYB 0001697503 Friedrichs Dale D 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP, Ops Excellence, HSE false Class A Ordinary Shares 2026-02-27 4 F false 682.00 57.52 D 47409.00 D Class A Ordinary Shares 2026-02-28 4 A false 15998.00 0.00 A 63407.00 D On February 27, 2026 the reporting person's restricted stock units automatically vested 3,097 shares. 682 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 8,620 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 2,428 granted on February 22, 2024 that vest on February 22, 2027; 3,096 granted on February 27, 2025 that vest on February 27, 2027 and 3,096 granted on February 27, 2025 that vest on February 27, 2028. Includes 24,618 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 2,428 granted on February 22, 2024 that vest on February 22, 2027; 3,096 granted on February 27, 2025 that vest on February 27, 2027 and 3,096 granted on February 27, 2025 that vest on February 27, 2028. The 15,998 RSUs reported on this Form 4 vest as follows: 5,334 vest on February 28, 2027, 5,332 vest on February 28, 2028 and 5,332 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03