X0609 4 2026-04-15 false 0001489393 LyondellBasell Industries N.V. LYB 0002062500 Hayes Matthew D true 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false SVP & CAO false Class A Ordinary Shares 2026-04-15 4 F false 40.00 73.13 D 8970.3012 D On April 15, 2026 the reporting person's restricted stock units automatically vested 163 shares. 40 shares were withheld by the issuer to satisfy the issuer's tax withholding obligations. Includes 5,828 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 237 granted on February 22, 2024 that vest on February 22, 2027; 623 granted on October 15, 2024 that vest on October 15, 2026; 305 granted on February 27, 2025 that vest on February 27, 2027; 305 granted on February 27, 2025 that vest on February 27, 2028; 163 granted on April 15, 2025 that vest on April 15, 2027; 163 granted on April 15, 2025 that vest on April 15, 2028; 1,344 granted on February 28, 2026 that vest on February 28, 2027, 1,344 granted on February 28, 2026 that vest on February 28, 2028 and 1,344 granted on February 28, 2026 that vest on February 28, 2029. ESPP purchase of 142.1216 shares for $38.97 per share were allocated on March 31, 2026. /s/ Lara A. Mason, Attorney-in-Fact 2026-04-17