UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 12, 2025

Delcath Systems, Inc.

(Exact name of registrant as specified in its charter)

Delaware

001-16133

06-1245881

(State or other jurisdiction
of incorporation)

(Commission

File Number)

(IRS Employer
Identification No.)

566 Queensbury Avenue

Queensbury, New York, 12804

(Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code: (212) 489-2100

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities pursuant to Section 12 (b) of the Act:

Title of Each Class

Trading
Symbol(s)

Name of Each Exchange

on Which Registered

Common Stock, $0.01 par value

DCTH

The Nasdaq Capital Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.03

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

Amended and Restated Bylaws

On August 12, 2025, the Board of Directors (the “Board”) of Delcath Systems, Inc. (the “Company”), acting upon the recommendation of the Nominating and Corporate Governance Committee of the Board, amended and restated the Company’s Amended and Restated By-Laws (the “Bylaws”), effective immediately. The Bylaws were updated to, among other things:

•

clarify procedural and informational requirements in connection with stockholder nominations of directors and submission of stockholder proposals pursuant to advance notice provisions;

•

update certain provisions related to the election of officers and the Chairperson of the Board as well as their duties;

•

describe the indemnification rights and the related obligations of the Company with respect to its directors, officers and other agents; and

•

incorporate administrative, modernizing, clarifying and conforming changes, including but not limited to, updates related to notice periods and remote communications.

The foregoing description does not purport to be complete and is qualified in its entirety by reference to the full text of the Bylaws, a copy of which is attached hereto as Exhibit 3.1 and incorporated herein by reference.

Item 9.01

Financial Statements and Exhibits

(d) Exhibits


Exhibit No.		Description

3.1		Amended and Restated By-Laws of Delcath Systems, Inc. dated August 12, 2025

104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: August 15, 2025

DELCATH SYSTEMS, INC.

/s/ David Hoffman

David Hoffman

General Counsel, Chief Compliance Officer and Secretary

DELCATH SYSTEMS, INC. 8-K