X0508 4 2026-02-27 false 0001489393 LyondellBasell Industries N.V. LYB 0001780174 Rhenman Torkel 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP, Adv Polymer Solutions false Class A Ordinary Shares 2026-02-27 4 F false 1196.00 57.52 D 94284.00 D Class A Ordinary Shares 2026-02-28 4 A false 22552.00 0.00 A 116836.00 D On February 27, 2026 the reporting person's restricted stock units automatically vested 4,366 shares. 1,196 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 12,201 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 3,473 granted on February 22, 2024 that vest on February 22, 2027; 4,364 granted on February 27, 2025 that vest on February 27, 2027 and 4,364 granted on February 27, 2025 that vest on February 27, 2028. Includes 34,753 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 3,473 granted on February 22, 2024 that vest on February 22, 2027; 4,364 granted on February 27, 2025 that vest on February 27, 2027 and 4,364 granted on February 27, 2025 that vest on February 27, 2028. The 22,552 RSUs reported on this Form 4 vest as follows: 7,518 vest on February 28, 2027, 7,517 vest on February 28, 2028 and 7,517 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03