X0508 4 2026-02-27 false 0001489393 LyondellBasell Industries N.V. LYB 0001791947 Foley Kimberly A 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false EVP, Global O&P and Refining false Class A Ordinary Shares 2026-02-27 4 F false 1087.00 57.52 D 67238.547 D Class A Ordinary Shares 2026-02-28 4 A false 23052.00 0.00 A 90290.547 D On February 27, 2026 the reporting person's restricted stock units automatically vested 4,462 shares. 1,087 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 12,287 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 3,365 granted on February 22, 2024 that vest on February 22, 2027; 4,461 granted on February 27, 2025 that vest on February 27, 2027 and 4,461 granted on February 27, 2025 that vest on February 27, 2028. Includes 35,339 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 3,365 granted on February 22, 2024 that vest on February 22, 2027; 4,461 granted on February 27, 2025 that vest on February 27, 2027 and 4,461 granted on February 27, 2025 that vest on February 27, 2028. The 23,052 RSUs reported on this Form 4 vest as follows: 7,684 vest on February 28, 2027, 7,684 vest on February 28, 2028 and 7,684 vest on February 28, 2029. /s/ Lara A. Mason, Attorney-in-Fact 2026-03-03