X0306 4 2019-03-04 true 0001489393 LyondellBasell Industries N.V. LYB 0001699680 Doktycz Stephen J 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false SVP, SP&T Class A Ordinary Shares 2019-03-04 4 F false 271.00 85.10 D 5103.713 D Class A Ordinary Shares 2019-03-04 4 F false 127.00 85.10 D 4976.713 D Class A Ordinary Shares 2019-03-04 4 F false 153.00 85.10 D 4823.713 D Class A Ordinary Shares 2019-03-04 4 D false 227.00 0.00 D 4596.713 D Class A Ordinary Shares 2019-03-04 4 D false 986.00 0.00 D 3610.713 D Class A Ordinary Shares 2019-03-04 4 D false 488.00 0.00 D 3122.713 D Represents shares withheld by the issuer to satisfy tax withholding obligations in connection with the pro-rata vesting of 1,110 shares of restricted stock units granted to the reporting person on March 1, 2017. Represents shares withheld by the issuer to satisfy tax withholding obligations in connection with the pro-rata vesting of 518 shares of restricted stock units granted to the reporting person on March 1, 2017. Represents shares withheld by the issuer to satisfy tax withholding obligations in connection with the pro-rata vesting of 628 shares of restricted stock units granted to the reporting person on February 21, 2018. The reporting person's employment with the company ended on March 5, 2019 and, pursuant to the terms of his restricted stock unit award, forfeited the 227 shares reported on this Form 4. Price is not applicable. The reporting person's employment with the company ended on March 5, 2019 and, pursuant to the terms of his restricted stock unit award, forfeited the 986 shares reported on this Form 4. The reporting person's employment with the company ended on March 5, 2019 and, pursuant to the terms of his restricted stock unit award, forfeited the 488 shares reported on this Form 4. /s/ Lara A. Mason, Attorney-in-Fact 2019-03-06