Sec Form 4 Filing - STOLL ROGER G PHD @ DELCATH SYSTEMS, INC. - 2024-05-23

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 STOLL ROGER G PHD 2. Issuer Name and Ticker or Trading Symbol DELCATH SYSTEMS, INC. [ DCTH] 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) C/O DELCATH SYSTEMS, INC., 566 QUEENSBURY AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 05/23/2024 (Street) QUEENSBURY, NY12804 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

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 Option (Right to Buy) $ 196.7 ( 1 ) 05/23/2024 D( 2 ) 142 ( 1 ) ( 2 ) 02/01/2029 Common Stock 142 ( 1 ) $ 0 0 D Stock Option (Right to Buy) $ 196.7 05/23/2024 A( 2 ) 142 ( 2 ) 05/23/2026 Common Stock 142 $ 0 142 D Stock Option (Right to Buy) $ 11.67 05/23/2024 D( 3 ) 40,000 ( 3 ) 10/01/2030 Common Stock 40,000 $ 0 0 D Stock Option (Right to Buy) $ 11.67 05/23/2024 A( 3 ) 40,000 ( 3 ) 05/23/2026 Common Stock 40,000 $ 0 40,000 D Stock Option (Right to Buy) $ 10.16 05/23/2024 D( 4 ) 9,000 ( 4 ) 08/05/2031 Common Stock 9,000 $ 0 0 D Stock Option (Right to Buy) $ 10.16 05/23/2024 A( 4 ) 9,000 ( 4 ) 05/23/2026 Common Stock 9,000 $ 0 9,000 D Stock Option (Right to Buy) $ 6.24 05/23/2024 D( 5 ) 9,000 ( 5 ) 05/04/2023 Common Stock 9,000 $ 0 0 D Stock Option (Right to Buy) $ 6.24 05/23/2024 A( 5 ) 9,000 ( 5 ) 05/23/2026 Common Stock 9,000 $ 0 9,000 D Stock Option (Right to Buy) $ 7.25 05/23/2024 D( 6 ) 19,682 ( 6 ) 06/12/2033 Common Stock 19,682 $ 0 0 D Stock Option (Right to Buy) $ 7.25 05/23/2024 A( 6 ) 19,682 ( 6 ) 05/23/2026 Common Stock 19,682 $ 0 19,682 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other STOLL ROGER G PHD C/O DELCATH SYSTEMS, INC. 566 QUEENSBURY AVENUE QUEENSBURY, NY12804 X Signatures /s/ David Hoffman, Attorney-in-Fact 05/28/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This option was previously reported as covering 100,000 shares at an exercise price of $0.281 per share, but was adjusted to reflect the stock split that occurred on December 24, 2019. ( 2 )The two reported transactions involved an amendment of an outstanding option to extend the post-termination exercise period, resulting in the deemed cancellation of the "old" option and the grant of a replacement option. The option was originally granted on February 1, 2019 and is fully vested. ( 3 )The two reported transactions involved an amendment of an outstanding option to extend the post-termination exercise period, resulting in the deemed cancellation of the "old" option and the grant of a replacement option. The option was originally granted on November 23, 2020 and is fully vested. ( 4 )The two reported transactions involved an amendment of an outstanding option to extend the post-termination exercise period, resulting in the deemed cancellation of the "old" option and the grant of a replacement option. The option was originally granted on August 5, 2021 and is fully vested. ( 5 )The two reported transactions involved an amendment of an outstanding option to extend the post-termination exercise period, resulting in the deemed cancellation of the "old" option and the grant of a replacement option. The option was originally granted on May 4, 2022 and is fully vested. ( 6 )The two reported transactions involved an amendment of an outstanding option to extend the post-termination exercise period, resulting in the deemed cancellation of the "old" option and the grant of a replacement option. The option was originally granted on June 12, 2023 and is fully vested.

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

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