X0306 4 2018-02-21 false 0001489393 LyondellBasell Industries N.V. LYB 0001649570 Guilfoyle James D 4TH FLOOR ONE VINE STREET LONDON X0 W1J 0AH UNITED KINGDOM false true false false SVP, Global I&D, Supply Chain Class A Ordinary Shares 2018-02-21 4 F false 54.00 109.09 D 9136.00 D Class A Ordinary Shares 2018-02-21 4 F false 197.00 109.09 D 8939.00 D Class A Ordinary Shares 2018-02-21 4 A false 2308.00 0.00 A 11247.00 D Class A Ordinary Shares 2018-02-21 4 A false 788.00 109.09 A 12035.00 D Class A Ordinary Shares 2018-02-21 4 A false 221.00 109.09 A 12256.00 D Stock Options (Right to Buy) 109.09 2018-02-21 4 A false 11651.00 0.00 A 2028-02-21 Class A Ordinary Shares 11651.00 11651.00 D Represents shares required to satisfy tax withholding obligations in connection with the vesting of 221 shares of performance-based stock granted to the Reporting Person on June 1, 2015. Includes 5,987 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 92 granted on June 1, 2015 vest on June 1, 2018; 1,461 granted on February 16, 2016 that vest on February 16, 2019 and 2,126 granted on February 16, 2017 that vest on February 16, 2020. The 2,308 RSUs reported on this Form 4 vest on February 21, 2021. Represents shares required to satisfy tax withholding obligations in connection with the vesting of 788 shares of performance-based stock granted to the Reporting Person on February 17, 2015. 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. Represents shares earned in connection with the performance-based stock previously granted and unreportable on June 1, 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: 3,885 vest on February 21, 2019, 3,883 vest on February 21, 2020 and 3,883 vest on February 21, 2021. /s/ Lara A. Mason, Attorney-in-Fact 2018-02-23