Sec Form 3 Filing - Squarer Ron @ ADC Therapeutics SA - 2024-01-02

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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Squarer Ron 2. Issuer Name and Ticker or Trading Symbol ADC Therapeutics SA [ ADCT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 430 MOUNTAIN AVENUE, SUITE 404 3. Date of Earliest Transaction (MM/DD/YY) 01/02/2024 (Street) NEW PROVIDENCE, NJ07974 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 47,658 ( 1 ) 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) $ 18.75 ( 2 ) 04/29/2030 Common Shares 497,542 D Stock Options (Right to Buy) $ 34.99 ( 3 ) 06/04/2030 Common Shares 341,403 D Stock Options (Right to Buy) $ 28.7 ( 4 ) 03/22/2031 Common Shares 43,859 D Stock Options (Right to Buy) $ 14 ( 5 ) 03/07/2032 Common Shares 75,375 D Stock Options (Right to Buy) $ 18.75 ( 6 ) 04/29/2030 Common Shares 468,977 I By grantor retained annuity trust

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Squarer Ron 430 MOUNTAIN AVENUE, SUITE 404 NEW PROVIDENCE, NJ07974 X Signatures /s/ Ameet Mallik, as Attorney-in-Fact for Ron Squarer 01/02/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 31,852 Common Shares to be delivered in settlement of a restricted share unit award ("RSU"). Each RSU represents a contingent right to receive one share of the Issuer's Common Shares. The RSUs were granted on June 14, 2023 and vest 100% as of the date of the Issuer's next scheduled annual meeting of shareholders, subject to the Reporting Person's continued service to the Issuer through the relevant vesting date. ( 2 )These options are fully vested and exercisable. ( 3 )These options are fully vested and exercisable. ( 4 )This option vests over four years from March 22, 2021, with 1/4 vesting on the first anniversary of such date, and the remainder vesting monthly in 36 equal installments, subject to continued service through each such vesting date. ( 5 )This option vests over four years from March 7, 2022, with 1/4 vesting on the first anniversary of such date, and the remainder vesting monthly in 36 equal installments, subject to continued service through each such vesting date. ( 6 )On July 22, 2021, the reporting person contributed 468,977 options to a grantor retained annuity trust for the benefit of the Ron Squarer 2014 Irrevocable Life Insurance Trust. The options were fully vested as of June 17, 2021.

Remarks: Exhibit List - Exhibit 24 - Power of Attorney

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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.