Sec Form 3 Filing - O'Brien Frances D. @ Chubb Ltd - 2023-05-17

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 O'Brien Frances D. 2. Issuer Name and Ticker or Trading Symbol Chubb Ltd [ CB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Risk Officer (Last) (First) (Middle) THE CHUBB BUILDING, 17 WOODBOURNE AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 05/17/2023 (Street) HAMILTON, D0HM 08 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 43,026 ( 1 ) ( 2 ) ( 3 ) ( 4 ) ( 5 ) ( 6 ) ( 7 ) ( 8 ) ( 9 ) ( 10 ) 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 Options to Acquire $ 139.01 ( 11 ) 02/23/2027 Common Shares 4,425 D Options to Acquire $ 143.07 ( 12 ) 02/22/2028 Common Shares 4,369 D Options to Acquire $ 133.9 ( 13 ) 02/28/2029 Common Shares 4,667 D Options to Acquire $ 150.11 ( 14 ) 02/27/2030 Common Shares 4,497 D Options to Acquire $ 164.94 ( 15 ) 02/25/2031 Common Shares 4,092 D Options to Acquire $ 199.03 ( 16 ) 02/24/2032 Common Shares 4,020 D Options to Acquire $ 208.6 ( 17 ) 02/23/2033 Common Shares 3,836 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other O'Brien Frances D. THE CHUBB BUILDING 17 WOODBOURNE AVENUE HAMILTON, D0HM 08 Chief Risk Officer Signatures /s/ Samantha Froud, Attorney-in-fact 05/17/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Included in the total are 843 restricted stock units ("RSUs") granted pursuant to the Chubb Limited 2016 Long-Term Incentive Plan (the "Plan"). These RSUs vest on February 27, 2024. Upon vesting, one Common Share will be delivered for each vested RSU. ( 2 )Included in the total are 767 RSUs granted pursuant to the Plan. These RSUs vest in equal installments on February 25, 2024 and February 25, 2025. Upon vesting, one Common Share will be delivered for each vested RSU. ( 3 )Included in the total are 1,131 RSUs granted pursuant to the Plan. These RSUs vest in equal installments on February 24, 2024, February 24, 2025 and February 24, 2026. Upon vesting, one Common Share will be delivered for each vested RSU. ( 4 )Included in the total are 1,438 RSUs granted pursuant to the Plan. These RSUs vest in equal installments on February 23, 2024, February 23, 2025, February 23, 2026 and February 23, 2027. Upon vesting, one Common Share will be delivered for each vested RSU. ( 5 )Included in the total are 1,535 shares of restricted stock granted pursuant to the Plan. These shares vest on February 25, 2024 subject to the satisfaction of certain service and performance based criteria. ( 6 )Included in the total are 1,508 shares of restricted stock granted pursuant to the Plan. These shares vest on February 24, 2025 subject to the satisfaction of certain service and performance based criteria. ( 7 )Included in the total are 1,439 shares of restricted stock granted pursuant to the Plan. These shares vest on February 23, 2026 subject to the satisfaction of certain service and performance based criteria. ( 8 )Included in the total are 999 shares of restricted stock granted pursuant to the Plan, representing a premium performance award with respect to the performance restricted stock awards. These shares vest on February 25, 2024 subject to the satisfaction of certain service and performance based criteria. These shares will not be entitled to vote until vested. Dividends on these shares shall be accumulated and distributed only when, and to the extent, that the shares have vested. ( 9 )Included in the total are 981 shares of restricted stock granted pursuant to the Plan, representing a premium performance award with respect to the performance restricted stock awards. These shares vest on February 24, 2025 subject to the satisfaction of certain service and performance based criteria. These shares will not be entitled to vote until vested. Dividends on these shares shall be accumulated and distributed only when, and to the extent, that the shares have vested. ( 10 )Included in the total are 936 shares of restricted stock granted pursuant to the Plan, representing a premium performance award with respect to the performance restricted stock awards. These shares vest on February 23, 2026 subject to the satisfaction of certain service and performance based criteria. These shares will not be entitled to vote until vested. Dividends on these shares shall be accumulated and distributed only when, and to the extent, that the shares have vested. ( 11 )Options awarded pursuant to the Plan. Options vested in equal installments on February 23, 2018, February 23, 2019 and February 23, 2020. ( 12 )Options awarded pursuant to the Plan. Options vested in equal installments on February 22, 2019, February 22, 2020 and February 22, 2021. ( 13 )Options awarded pursuant to the Plan. Options vested in equal installments on February 28, 2020, February 28, 2021 and February 28, 2022. ( 14 )Options awarded pursuant to the Plan. Options vested in equal installments on February 27, 2021, February 27, 2022 and February 27, 2023. ( 15 )Options awarded pursuant to the Plan. Options vested or will vest in equal installments on February 25, 2022, February 25, 2023 and February 25, 2024. ( 16 )Options awarded pursuant to the Plan. Options vested or will vest in equal installments on February 24, 2023, February 24, 2024 and February 24, 2025. ( 17 )Options awarded pursuant to the Plan. Options will vest in equal installments on February 23, 2024, February 23, 2025 and February 23, 2026.

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