LYB

SEC source: 0001562180-23-001511 · primarydocument.xml · nonDerivative · entry 3

Foley Kimberly A · CIK 0001791947 · EVP, Refining, I&D

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,805.547

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents a cashless exercise-and-hold, where shares were withheld to cover the option exercise price and anticipated taxes, and the remaining shares are retained by the reporting person.

F2 · balance_after: Includes 5,502 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 750 granted on February 20, 2020 that vest on February 20, 2023; 234 granted on August 1, 2020 that vest on August 1, 2023; 1,444 granted on February 25, 2021 that vest on February 25, 2024; 2,193 granted on February 24, 2022 that vest on February 24, 2025 and 881 granted on October 15, 2022 that vest on October 15, 2025.

SEC source: 0001562180-23-001511 · primarydocument.xml · nonDerivative · entry 2

Foley Kimberly A · CIK 0001791947 · EVP, Refining, I&D

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,688.547

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents a cashless exercise-and-hold, where shares were withheld to cover the option exercise price and anticipated taxes, and the remaining shares are retained by the reporting person.

F2 · balance_after: Includes 5,502 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 750 granted on February 20, 2020 that vest on February 20, 2023; 234 granted on August 1, 2020 that vest on August 1, 2023; 1,444 granted on February 25, 2021 that vest on February 25, 2024; 2,193 granted on February 24, 2022 that vest on February 24, 2025 and 881 granted on October 15, 2022 that vest on October 15, 2025.

SEC source: 0001562180-23-001511 · primarydocument.xml · nonDerivative · entry 1

Foley Kimberly A · CIK 0001791947 · EVP, Refining, I&D

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,981.547

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents a cashless exercise-and-hold, where shares were withheld to cover the option exercise price and anticipated taxes, and the remaining shares are retained by the reporting person.

F2 · balance_after: Includes 5,502 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 750 granted on February 20, 2020 that vest on February 20, 2023; 234 granted on August 1, 2020 that vest on August 1, 2023; 1,444 granted on February 25, 2021 that vest on February 25, 2024; 2,193 granted on February 24, 2022 that vest on February 24, 2025 and 881 granted on October 15, 2022 that vest on October 15, 2025.

SEC source: 0001562180-23-001190 · primarydocument.xml · derivative · entry 2

Seward James Malcolm · CIK 0001783902 · EVP & Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 424 shares

Expires 2029-08-15

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents a buy and hold exercise by the reporting person.

F3 · derivative.exercise_date: Granted pursuant to the issuer's long-term incentive plan. Award has fully vested.

SEC source: 0001562180-23-001190 · primarydocument.xml · nonDerivative · entry 1

Seward James Malcolm · CIK 0001783902 · EVP & Chief Innovation Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,372

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents a buy and hold exercise by the reporting person.

F2 · balance_after: Includes 4,567 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,198 granted on February 20, 2020 that vest on February 20, 2023; 1,433 granted on February 25, 2021 that vest on February 25, 2024; 1,768 granted on February 24, 2022 that vest on February 24, 2025 and 168 granted on October 15, 2022 that vest on October 15, 2025.

SEC source: 0001562180-23-001189 · primarydocument.xml · derivative · entry 3

Lane Kenneth Todd · CIK 0001782276 · EVP, Olefins and Polyolefins

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Ordinary Shares · 4,782 shares

Expires 2029-07-15

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents a cashless exercise-and-hold, where shares were withheld to cover the option exercise price and anticipated taxes, and the remaining shares are retained by the reporting person.

F4 · derivative.exercise_date: Granted pursuant to the issuer's long-term incentive plan. Award has fully vested.

SEC source: 0001562180-23-001189 · primarydocument.xml · nonDerivative · entry 2

Lane Kenneth Todd · CIK 0001782276 · EVP, Olefins and Polyolefins

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,873.1519

F1 · kind: Represents a cashless exercise-and-hold, where shares were withheld to cover the option exercise price and anticipated taxes, and the remaining shares are retained by the reporting person.

F2 · balance_after: Includes 32,684 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 5,774 granted on February 20, 2020 that vest on February 20, 2023; 5,878 granted on February 25, 2021 that vest on February 25, 2024; 7,200 granted February 24, 2022 that vest on February 24, 2025 and 13,832 granted on May 26, 2022 that vest on May 26, 2024.

SEC source: 0001562180-23-001189 · primarydocument.xml · nonDerivative · entry 1

Lane Kenneth Todd · CIK 0001782276 · EVP, Olefins and Polyolefins

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 59,974.1519

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents a cashless exercise-and-hold, where shares were withheld to cover the option exercise price and anticipated taxes, and the remaining shares are retained by the reporting person.

F2 · balance_after: Includes 32,684 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 5,774 granted on February 20, 2020 that vest on February 20, 2023; 5,878 granted on February 25, 2021 that vest on February 25, 2024; 7,200 granted February 24, 2022 that vest on February 24, 2025 and 13,832 granted on May 26, 2022 that vest on May 26, 2024.

F3 · balance_after: Incudes purchase of 40.129590 shares for $ 67.752 per share allocated on September 30, 2022, pursuant to the Issuer's Employee Stock Purchase Plan.

SEC source: 0001562180-23-001188 · primarydocument.xml · nonDerivative · entry 1

Kaplan Jeffrey A · CIK 0001634184 · EVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,600

F1 · price: This transaction was executed in multiple trades at prices ranging from $98.685 USD to $99.26. The price reported above reflects the weighted-average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes 14,979 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan including 4,802 granted on February 20, 2020 that vest on February 20, 2023; 4,967 granted on February 25, 2021 that vest on February 25, 2024 and 5,210 granted on February 24, 2022 that vest on February 24, 2025.

SEC source: 0001562180-23-000126 · primarydocument.xml · nonDerivative · entry 1

KAMSKY VIRGINIA A · CIK 0001059614 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,120

F1 · kind: Prior to the beginning of the year, the reporting person elected to receive common stock in lieu of cash for her annual retainer, which retainer is paid in quarterly installments. The number of shares issued was calculated based on $81.92, which is the average of the daily closing prices of the issuer's shares over the applicable quarter.

F1 · shares: Prior to the beginning of the year, the reporting person elected to receive common stock in lieu of cash for her annual retainer, which retainer is paid in quarterly installments. The number of shares issued was calculated based on $81.92, which is the average of the daily closing prices of the issuer's shares over the applicable quarter.

F2 · balance_after: Includes restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan, including 1,564 granted on May 27, 2022 that vest May 27, 2023.

SEC source: 0001562180-23-000156 · primarydocument.xml · nonDerivative · entry 1

DICCIANI NANCE K · CIK 0001198097 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,836.612

F1 · kind: Prior to the beginning of the year, the reporting person elected to receive common stock in lieu of cash for her annual retainer, which retainer is paid in quarterly installments. The number of shares issued was calculated based on $81.92, which is the average of the daily closing prices of the issuer's shares over the applicable quarter.

F1 · shares: Prior to the beginning of the year, the reporting person elected to receive common stock in lieu of cash for her annual retainer, which retainer is paid in quarterly installments. The number of shares issued was calculated based on $81.92, which is the average of the daily closing prices of the issuer's shares over the applicable quarter.

F2 · balance_after: Includes restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan, including 1,568 granted on May 26, 2022 that vest May 26, 2023.

SEC source: 0001562180-23-000128 · primarydocument.xml · nonDerivative · entry 6

Sharma Anup · CIK 0001767575 · SVP, Global Business Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,558

F5 · shares: The reporting person resigned effective December 31, 2022 and, pursuant to the terms of his restricted stock unit award, forfeited the 63 shares reported on this Form 4.

F3 · price: Price is not applicable.

SEC source: 0001562180-23-000128 · primarydocument.xml · nonDerivative · entry 5

Sharma Anup · CIK 0001767575 · SVP, Global Business Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,621

F4 · shares: The reporting person resigned effective December 31, 2022 and, pursuant to the terms of his restricted stock unit award, forfeited the 1,618 shares reported on this Form 4.

F3 · price: Price is not applicable.

SEC source: 0001562180-23-000128 · primarydocument.xml · nonDerivative · entry 4

Sharma Anup · CIK 0001767575 · SVP, Global Business Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,239

F2 · shares: The reporting person resigned effective December 31, 2022 and, pursuant to the terms of his restricted stock unit award, forfeited the 759 shares reported on this Form 4.

F3 · price: Price is not applicable.

SEC source: 0001562180-23-000128 · primarydocument.xml · nonDerivative · entry 3

Sharma Anup · CIK 0001767575 · SVP, Global Business Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,998

F1 · price: This transaction was executed in multiple trades at prices ranging from $84.58 USD to $85.20 USD. The price reported above reflects the weighted-average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001562180-23-000128 · primarydocument.xml · nonDerivative · entry 2

Sharma Anup · CIK 0001767575 · SVP, Global Business Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,538

F1 · price: This transaction was executed in multiple trades at prices ranging from $84.58 USD to $85.20 USD. The price reported above reflects the weighted-average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001562180-23-000128 · primarydocument.xml · nonDerivative · entry 1

Sharma Anup · CIK 0001767575 · SVP, Global Business Services

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,825

F1 · price: This transaction was executed in multiple trades at prices ranging from $84.58 USD to $85.20 USD. The price reported above reflects the weighted-average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001562180-23-000127 · primarydocument.xml · nonDerivative · entry 1

CHASE ANTHONY R · CIK 0001223756 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,851

F1 · kind: Prior to the beginning of the year, the reporting person elected to receive partial payment in common stock in lieu of cash for his annual retainer, which retainer is paid in quarterly installments. The number of shares issued was calculated based on $81.92, which is the average of the daily closing prices of the issuer's shares over the applicable quarter.

F1 · shares: Prior to the beginning of the year, the reporting person elected to receive partial payment in common stock in lieu of cash for his annual retainer, which retainer is paid in quarterly installments. The number of shares issued was calculated based on $81.92, which is the average of the daily closing prices of the issuer's shares over the applicable quarter.

F2 · balance_after: Includes restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan, including 1,568 granted on May 26, 2022 that vest on May 26, 2023.

SEC source: 0001209191-23-008690 · doc5.xml · nonDerivative · entry 1

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 2,669,099

F1 · price: These shares were donated by AIPH Holdings LLC ("AIPH") for no consideration as a charitable contribution.

F2 · ownership.direct: The securities reported were, at the time of transfer or December 31, 2022, as applicable, held directly by AIPH and may be deemed to be indirectly beneficially owned by Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIPH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC and AIPH and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

SEC source: 0001562180-23-005840 · primarydocument.xml · nonDerivative · entry 6

CHASE ANTHONY R · CIK 0001223756 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,892

F1 · security: This Form 4 is being filed late due to inadvertent administrative error. The Reporting Person has agreed to voluntarily disgorge to the Issuer all short-swing profits realized by the Reporting Person from relevant transactions.

F2 · shares: Transactions were made by third-party manager and were not subject to the discretion of Reporting Person.

F3 · balance_after: Includes restricted stock units granted pursuant to the issuer's long-term incentive plan, including 1,860 granted on May 18, 2023 that vest on May 18, 2024.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 15

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 3,321

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.12, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F9 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F11 · ownership.direct: The securities reported are held directly by Altep 2010.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 14

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 68,408

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.12, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F9 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F10 · ownership.direct: The securities reported are held directly by Altep 2014.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 13

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 766,479

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.12, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F8 · ownership.direct: The securities reported are held directly by AIIH and may be deemed to be indirectly beneficially owned by Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC and AIIH, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 12

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 41,196,636

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.12, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F7 · ownership.direct: The securities reported are held directly by LYB Holdco LLC (formerly AI International Chemicals LLC) ("LYB Holdco") and may be deemed to be indirectly beneficially owned by AI Investments Holdings LLC ("AIIH"), Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because AIIH holds a majority of the outstanding voting interests in LYB Holdco, Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC, AIIH and LYB Holdco, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 11

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 5,836,034

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.12, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F5 · ownership.direct: The securities reported are held directly by AICH and and may be deemed to be indirectly beneficially owned by Access Industries Management, LLC, Access Industries Holdings LLC and Len Blavatnik because Mr. Blavatnik controls Access Industries Management, LLC, Access Industries Holdings LLC owns a majority of the outstanding voting interests in RSB 2 Limited which is the sole member of AICH, and Access Industries Management, LLC controls AICH and Access Industries Holdings LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 10

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 3,357

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F6 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $85.50 to $86.36, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F9 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F11 · ownership.direct: The securities reported are held directly by Altep 2010.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 9

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 3,366

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.49, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F9 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F11 · ownership.direct: The securities reported are held directly by Altep 2010.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 8

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 68,745

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F6 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $85.50 to $86.36, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F9 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F10 · ownership.direct: The securities reported are held directly by Altep 2014.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 7

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 68,831

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.49, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F9 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F10 · ownership.direct: The securities reported are held directly by Altep 2014.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 6

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 766,633

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F6 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $85.50 to $86.36, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F8 · ownership.direct: The securities reported are held directly by AIIH and may be deemed to be indirectly beneficially owned by Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC and AIIH, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 5

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 766,672

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.49, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F8 · ownership.direct: The securities reported are held directly by AIIH and may be deemed to be indirectly beneficially owned by Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC and AIIH, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 4

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 41,197,197

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F6 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $85.50 to $86.36, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F7 · ownership.direct: The securities reported are held directly by LYB Holdco LLC (formerly AI International Chemicals LLC) ("LYB Holdco") and may be deemed to be indirectly beneficially owned by AI Investments Holdings LLC ("AIIH"), Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because AIIH holds a majority of the outstanding voting interests in LYB Holdco, Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC, AIIH and LYB Holdco, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 3

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 41,197,340

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.49, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F7 · ownership.direct: The securities reported are held directly by LYB Holdco LLC (formerly AI International Chemicals LLC) ("LYB Holdco") and may be deemed to be indirectly beneficially owned by AI Investments Holdings LLC ("AIIH"), Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because AIIH holds a majority of the outstanding voting interests in LYB Holdco, Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC, AIIH and LYB Holdco, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 2

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 6,564,946

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F6 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $85.50 to $86.36, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F5 · ownership.direct: The securities reported are held directly by AICH and and may be deemed to be indirectly beneficially owned by Access Industries Management, LLC, Access Industries Holdings LLC and Len Blavatnik because Mr. Blavatnik controls Access Industries Management, LLC, Access Industries Holdings LLC owns a majority of the outstanding voting interests in RSB 2 Limited which is the sole member of AICH, and Access Industries Management, LLC controls AICH and Access Industries Holdings LLC.

SEC source: 0001209191-22-059644 · doc4.xml · nonDerivative · entry 1

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 6,751,081

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.49, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F5 · ownership.direct: The securities reported are held directly by AICH and and may be deemed to be indirectly beneficially owned by Access Industries Management, LLC, Access Industries Holdings LLC and Len Blavatnik because Mr. Blavatnik controls Access Industries Management, LLC, Access Industries Holdings LLC owns a majority of the outstanding voting interests in RSB 2 Limited which is the sole member of AICH, and Access Industries Management, LLC controls AICH and Access Industries Holdings LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 14

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 3,392

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.22, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F8 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F11 · ownership.direct: The securities reported are held directly by Altep 2010.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 13

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 69,067

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.22, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F8 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F9 · ownership.direct: The securities reported are held directly by Altep 2014.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 12

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 766,780

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.22, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F7 · ownership.direct: The securities reported are held directly by AIIH and may be deemed to be indirectly beneficially owned by Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC and AIIH, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 11

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 41,197,733

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.22, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F6 · ownership.direct: The securities reported are held directly by LYB Holdco LLC (formerly AI International Chemicals LLC) ("LYB Holdco") and may be deemed to be indirectly beneficially owned by AI Investments Holdings LLC ("AIIH"), Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because AIIH holds a majority of the outstanding voting interests in LYB Holdco, Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC, AIIH and LYB Holdco, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 10

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 7,262,204

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F12 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.22, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F5 · ownership.direct: The securities reported are held directly by AICH and and may be deemed to be indirectly beneficially owned by Access Industries Management, LLC, Access Industries Holdings LLC and Len Blavatnik because Mr. Blavatnik controls Access Industries Management, LLC, Access Industries Holdings LLC owns a majority of the outstanding voting interests in RSB 2 Limited which is the sole member of AICH, and Access Industries Management, LLC controls AICH and Access Industries Holdings LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 9

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 3,443

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F10 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.4325, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F8 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F11 · ownership.direct: The securities reported are held directly by Altep 2010.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 8

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 69,529

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F10 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.4325, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F8 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F9 · ownership.direct: The securities reported are held directly by Altep 2014.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 7

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 766,990

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F10 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.4325, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F7 · ownership.direct: The securities reported are held directly by AIIH and may be deemed to be indirectly beneficially owned by Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC and AIIH, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 6

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 41,198,503

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F10 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.4325, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F6 · ownership.direct: The securities reported are held directly by LYB Holdco LLC (formerly AI International Chemicals LLC) ("LYB Holdco") and may be deemed to be indirectly beneficially owned by AI Investments Holdings LLC ("AIIH"), Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because AIIH holds a majority of the outstanding voting interests in LYB Holdco, Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC, AIIH and LYB Holdco, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 5

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 8,263,385

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F10 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.50 to $85.4325, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F5 · ownership.direct: The securities reported are held directly by AICH and and may be deemed to be indirectly beneficially owned by Access Industries Management, LLC, Access Industries Holdings LLC and Len Blavatnik because Mr. Blavatnik controls Access Industries Management, LLC, Access Industries Holdings LLC owns a majority of the outstanding voting interests in RSB 2 Limited which is the sole member of AICH, and Access Industries Management, LLC controls AICH and Access Industries Holdings LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 4

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnership

Disclosed balance after: 69,708

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.51 to $85.19, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F8 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F9 · ownership.direct: The securities reported are held directly by Altep 2014.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 3

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 767,072

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.51 to $85.19, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F7 · ownership.direct: The securities reported are held directly by AIIH and may be deemed to be indirectly beneficially owned by Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC and AIIH, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 2

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 41,198,801

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.51 to $85.19, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F6 · ownership.direct: The securities reported are held directly by LYB Holdco LLC (formerly AI International Chemicals LLC) ("LYB Holdco") and may be deemed to be indirectly beneficially owned by AI Investments Holdings LLC ("AIIH"), Access Industries, LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik because AIIH holds a majority of the outstanding voting interests in LYB Holdco, Access Industries Holdings LLC controls a majority of the outstanding voting interests in AIIH, Access Industries, LLC controls a majority of the outstanding voting interests in Access Industries Holdings LLC, Access Industries Management, LLC controls Access Industries, LLC, Access Industries Holdings LLC, AIIH and LYB Holdco, and Mr. Blavatnik controls Access Industries Management, LLC and a majority of the outstanding voting interests in Access Industries, LLC.

SEC source: 0001209191-22-059114 · doc4.xml · nonDerivative · entry 1

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 8,650,534

F1 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons previously made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V. in connection with matchable sales on November 15, 2022, representing the full amount of the profit realized in connection with such short-swing transactions, less transaction costs. Because the sales reported herein occurred at a price lower than the price the reporting persons sold at on November 15, 2022, there are no additional recoverable profits subject to disgorgement in connection with these transactions.

F2 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $84.51 to $85.19, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F3 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F4 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F5 · ownership.direct: The securities reported are held directly by AICH and and may be deemed to be indirectly beneficially owned by Access Industries Management, LLC, Access Industries Holdings LLC and Len Blavatnik because Mr. Blavatnik controls Access Industries Management, LLC, Access Industries Holdings LLC owns a majority of the outstanding voting interests in RSB 2 Limited which is the sole member of AICH, and Access Industries Management, LLC controls AICH and Access Industries Holdings LLC.

SEC source: 0001209191-22-057758 · doc4.xml · nonDerivative · entry 8

AI INVESTMENTS HOLDINGS LLC · CIK 0001508237 · 10% owner

Access Industries Holdings LLC · CIK 0001391297 · 10% owner

ACCESS INDUSTRIES, LLC · CIK 0001508227 · 10% owner

ACCESS INDUSTRIES MANAGEMENT, LLC · CIK 0001508226 · 10% owner

Blavatnik Len · CIK 0001326628 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By partnerships

Disclosed balance after: 73,175

F5 · kind: The reporting persons' sales of ordinary shares reported herein are matchable under Section 16(b) of the Securities Exchange Act of 1934, as amended, to the extent of 4,000 shares, with the reporting persons' or their affiliate's purchase of 4,000 shares on November 1, 2022. The reporting persons have made arrangements with LyondellBasell Industries N.V. to voluntarily disgorge an aggregate of $37,197.89 to LyondellBasell Industries N.V., representing the full amount of the profit realized in connection with the short-swing transactions, less transaction costs.

F6 · price: The price reported in Column 4 is a weighted average sales price of the ordinary shares. The ordinary shares were sold in multiple transactions ranging from $86.80 to $87.33, inclusive. The reporting persons undertake to provide to LyondellBasell Industries N.V., any security holder of LyondellBasell Industries N.V., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of ordinary shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

F2 · ownership.direct: Each of the reporting persons (other than the direct holder) disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this Form shall not be construed as an admission that any such reporting person is the beneficial owner of any such securities.

F3 · ownership.direct: Because of their relationships with the other reporting persons, each of Access Industries Holdings LLC, Access Industries, LLC and Access Industries Management, LLC may be deemed to beneficially own the ordinary shares held directly by Altep 2010 L.P. ("Altep 2010"), Altep 2014 L.P. ("Altep 2014"), AI Altep Investments LLC (formerly AI New Holdings LLC) and AI Chemical Holdings LLC (formerly, AI New Holdings 2 LLC) ("AICH"). Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by AI Altep Investments LLC because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. holds all of the outstanding voting interests in AI Altep Investments LLC. Each of the reporting persons, and each of their affiliated entities and the officers, partners, members, and managers thereof, disclaims beneficial ownership of the ordinary shares held directly by each of Altep 2010, Altep 2014, AI Altep Investments LLC and AI Chemical Holdings LLC.

F9 · ownership.direct: Len Blavatnik may be deemed to indirectly beneficially own the ordinary shares held directly by Altep 2010 and Altep 2014 because he controls AI Altep Holdings, Inc. and AI Altep Holdings, Inc. is the general partner of each of Altep 2010 and Altep 2014.

F10 · ownership.direct: The securities reported are held directly as follows: (i) 3,461 ordinary shares by Altep 2010 and (ii) 69,714 ordinary shares by Altep 2014.