Sec Form 4 Filing - Seward James Malcolm @ LyondellBasell Industries N.V. - 2024-02-25

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Seward James Malcolm 2. Issuer Name and Ticker or Trading Symbol LyondellBasell Industries N.V. [ LYB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP & Chief Innovation Officer (Last) (First) (Middle) 4TH FLOOR, ONE VINE STREET 3. Date of Earliest Transaction (MM/DD/YY) 02/25/2024 (Street) LONDON, X0W1J 0AH 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Ordinary Shares 02/25/2024 F 710 ( 1 ) D $ 99.27 29,038 ( 2 ) D Class A Ordinary Shares 02/26/2024 M( 3 ) 212 A $ 77.8 29,250 ( 2 ) D Class A Ordinary Shares 02/26/2024 M( 3 ) 3,340 A $ 94.65 32,590 ( 2 ) D Class A Ordinary Shares 02/26/2024 M( 3 ) 4,661 A $ 89.26 37,251 ( 2 ) D Class A Ordinary Shares 02/26/2024 F( 3 ) 190 D $ 98.82 37,061 ( 2 ) D Class A Ordinary Shares 02/26/2024 F( 3 ) 3,269 D $ 98.82 33,792 ( 2 ) D Class A Ordinary Shares 02/26/2024 F( 3 ) 4,434 D $ 98.82 29,358 ( 2 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Options (Right to Buy) $ 94.65 02/26/2024 M 3,340 ( 4 ) 02/23/2033 Class A Ordinary Shares 3,340 $ 0 6,678 D Stock Options (Right to Buy) $ 89.26 02/26/2024 M 4,661 ( 5 ) 02/24/2032 Class A Ordinary Shares 4,661 $ 0 2,330 D Stock Options (Right to Buy) $ 77.8 02/26/2024 M 212 ( 6 ) 10/15/2032 Class A Ordinary Shares 212 $ 0 424 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Seward James Malcolm 4TH FLOOR ONE VINE STREET LONDON, X0W1J 0AH EVP & Chief Innovation Officer Signatures /s/ Lara A. Mason, Attorney-in-Fact 02/27/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares withheld by the issuer to satisfy tax withholding obligations in connection with the vesting 1,433 shares of restricted stock units granted to the reporting person on February 25, 2021. ( 2 )Includes 9,663 restricted stock units ("RSUs") granted pursuant to the issuer's long-term incentive plan: 1,768 granted on February 24, 2022 that vest on February 24, 2025; 168 granted on October 15, 2022 that vest on October 15, 2025; 2,639 granted on February 23, 2023 that vest on February 23, 2026 and 5,088 granted on February 22, 2024 of which 1,696 vest on February 22, 2025, 1,696 vest on February 22, 2026 and 1,696 vest on February 22, 2027. ( 3 )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. ( 4 )Granted pursuant to the issuer's long-term incentive plan. Award vests as follows: 3,340 vested on February 23, 2024, 3,339 vest on February 23, 2025 and 3,339 vest on February 23, 2026. ( 5 )Granted pursuant to the issuer's long-term incentive plan. Award vests as follows: 2,331 vested on February 24, 2023, 2,330 vested on February 24, 2024 and 2,330 vest on February 24, 2025. ( 6 )Granted pursuant to the issuer's long-term incentive plan. Award vests as follows: 212 vested on October 15, 2023, 212 vest on October 15, 2024 and 212 vest on October 15, 2025.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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