Sec Form 3 Filing - Mawjee Jehan @ Borr Drilling Ltd - 2026-03-18

FORM 3 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 Mawjee Jehan 2. Issuer Name and Ticker or Trading Symbol Borr Drilling Ltd [ BORR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Accounting Officer (Last) (First) (Middle) C/O BORR DRILLING LIMITED, 2ND FLOOR 9 PAR-LA-VILLE ROAD 3. Date of Earliest Transaction (MM/DD/YY) 03/18/2026 (Street) HAMILTONHM11 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 Common Shares 0 ( 1 ) D Common Shares 0 ( 2 ) D Common Shares 0 ( 3 ) 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 Employee Stock Option to Purchase Common Shares $ 6.31 03/01/2025( 4 ) 11/17/2028 Common Shares 41,667 D Employee Stock Option to Purchase Common Shares $ 6.31 03/01/2026( 4 ) 11/17/2028 Common Shares 41,667 D Employee Stock Option to Purchase Common Shares $ 6.31 03/01/2027( 4 ) 11/17/2028 Common Shares 41,666 D Employee Stock Option to Purchase Common Shares $ 6.54 08/15/2025( 5 ) 08/15/2029 Common Shares 41,666 D Employee Stock Option to Purchase Common Shares $ 6.54 08/15/2026( 5 ) 08/15/2029 Common Shares 41,667 D Employee Stock Option to Purchase Common Shares $ 6.54 08/15/2027( 5 ) 08/15/2029 Common Shares 41,667 D Employee Stock Option to Purchase Common Shares $ 3.66 03/01/2024( 6 ) 09/01/2027 Common Shares 43,334 D Employee Stock Option to Purchase Common Shares $ 4.41 03/01/2025( 6 ) 09/01/2027 Common Shares 43,333 D Employee Stock Option to Purchase Common Shares $ 5.16 03/01/2026( 6 ) 09/01/2027 Common Shares 43,333 D Employee Stock Option to Purchase Common Shares $ 1.66 08/12/2024( 7 ) 08/12/2026 Common Shares 33,334 D Employee Stock Option to Purchase Common Shares $ 1.66 08/12/2025( 7 ) 08/12/2026 Common Shares 66,666 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Mawjee Jehan C/O BORR DRILLING LIMITED 2ND FLOOR 9 PAR-LA-VILLE ROAD HAMILTONHM11 Chief Accounting Officer Signatures /s/ Temi Bankole as attorney-in-fact 03/18/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )22,910 RSUs that vest on September 1, 2026 and are conditional on the grantee remaining in continuous employment with the Company ( 2 )22,909 RSUs that vest on September 1, 2027 and are conditional on the grantee remaining in continuous employment with the Company ( 3 )22,910 RSUs that vest on September 1, 2028 and are conditional on the grantee remaining in continuous employment with the Company ( 4 )Grant of options on November 17, 2023 - options 1/3 vest every March 1 between 2025 and 2027 with strike price as at date of filing ( 5 )Grant of options on August 15, 2024 - options 1/3 vest every August 15 between 2025 and 2027 with strike price as at date of filing ( 6 )Grant of options on September 1, 2022 - options 1/3 vest every March 1 between 2024 and 2026 with staggered strike price as at date of filing ( 7 )Grant of options on August 12, 2021 - options 1/3 vest every August 1 between 2023 and 2025 with strike price as at date of filing

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).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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