X0508 4 2026-02-27 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 2026-02-27 4 F false 248.00 57.52 D 13078.36 D Class A Ordinary Shares 2026-02-28 4 A false 5282.00 0.00 A 18360.36 D Class A Ordinary Shares 6855.097 I By Spouse On February 27, 2026 the reporting person's restricted stock units automatically vested 1,023 shares. 248 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 4,249 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 2,205 granted on February 22, 2024 of which 735 were deferred on February 22, 2025, 735 were deferred on February 22, 2026; 735 vest on February 22, 2027; 1,022 granted on February 27, 2025 that vest on February 27, 2027 and 1,022 granted on February 27, 2025 that vest on February 27, 2028. Includes 9,531 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 2,205 granted on February 22, 2024 of which 735 were deferred on February 22, 2025, 735 were deferred on February 22, 2026; 735 vest on February 22, 2027; 1,022 granted on February 27, 2025 that vest on February 27, 2027 and 1,022 granted on February 27, 2025 that vest on February 27, 2028. The 5,282 RSUs reported on this Form 4 vest as follows: 1,762 vest on February 28, 2027, 1,760 vest on February 28, 2028 and 1,760 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03