X0306 4 2018-02-21 false 0001489393 LyondellBasell Industries N.V. LYB 0001500649 Covezzi Massimo 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false SVP Research & Development Class A Ordinary Shares 2018-02-21 4 F false 1311.00 109.09 D 9856.00 D Class A Ordinary Shares 2018-02-21 4 A false 1247.00 0.00 A 11103.00 D Class A Ordinary Shares 2018-02-21 4 A false 2841.00 109.09 A 13944.00 D Stock Options (Right to Buy) 109.09 2018-02-21 4 A false 6292.00 0.00 A 2028-02-21 Class A Ordinary Shares 6292.00 6292.00 D Represents shares required to satisfy tax withholding obligations in connection with the vesting of 2,841 shares of performance-based stock granted to the Reporting Person on February 17, 2015. Includes 3,917 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,436 granted on February 16, 2016 that vest on February 16, 2019 and 1,234 granted on February 16, 2017 that vest on February 16, 2020. The 1,247 RSUs reported on this Form 4 vest on February 21, 2021. Represents shares earned in connection with the performance-based stock previously granted and unreportable on February 17, 2015 pursuant to the issuer's long-term incentive plan. Shares were earned based upon the level of attainment of certain performance objectives and continued employment. These shares fully vested on February 21, 2018 following certification by the Issuer's compensation committee. Granted pursuant to the issuer's long-term incentive plan. Award vests as follows: 2,098 vest on February 21, 2019, 2,097 vest on February 21, 2020 and 2,097 vest on February 21, 2021. /s/ Lara A. Mason, Attorney-in-Fact 2018-02-23