DCTH

dcth-20260226FALSE000087291200008729122026-02-262026-02-26

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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): February 26, 2026

DELCATH SYSTEMS, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware001-1613306-1245881 (State or other jurisdiction of incorporation or organization)(Commission File Number)(IRS Employer Identification No.)

566 Queensbury Avenue Queensbury, NY 12804 (Address of principal executive offices) (Zip Code) (518) 743-8892 (Registrant’s telephone number, including area code) Not Applicable (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 registered pursuant to Section 12(b) of the Act:

Title of each class Trading Name of each exchange

symbol(s) on which registered

Common Stock, $.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 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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 2.02 Results of Operations and Financial Condition.

On February 26, 2026, Delcath Systems, Inc. (“Delcath”) issued a press release announcing financial results and business highlights for the year and quarter ended December 31, 2025 (the “Press Release”). A copy of the press release is furnished pursuant to Item 2.02 as Exhibit 99.1 hereto and is incorporated herein by reference.

The information contained in this Current Report on Form 8-K, including the Press Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended. The information contained herein and in the Press Release shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission by Delcath whether made before or after the date hereof, regardless of any general incorporation language in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1Press Release, dated February 26, 2026

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

SIGNATURE

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

DELCATH SYSTEMS, INC.

Date: February 26, 2026 By: /s/ Gerard Michel Name: Gerard Michel

Title: Chief Executive Officer

8-K

NASDAQ false 0000872912 0000872912 2026-01-09 2026-01-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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): January 9, 2026

DELCATH SYSTEMS, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware

001-16133

06-1245881

(State or other jurisdiction of incorporation or organization)

(Commission File Number)

(IRS Employer Identification No.)

566 Queensbury Avenue Queensbury, NY 12804 (Address of principal executive offices) (Zip Code) (518) 743-8892 (Registrant’s telephone number, including area code) Not Applicable (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 registered pursuant to Section 12(b) of the Act:

Title of each class

Trading symbol(s)

Name of each exchange on which registered

Common Stock, $.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 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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 2.02 Results of Operations and Financial Condition. On January 9, 2026, Delcath Systems, Inc. (“Delcath”) issued a press release (the “Press Release”) and released a presentation (the “Corporate Presentation”) each announcing preliminary financial results for the quarter ended and full year ended December 31, 2025. Copies of the Press Release and the Corporate Presentation are furnished pursuant to Item 2.02 as Exhibit 99.1 and Exhibit 99.2, respectively, and each such exhibit is incorporated herein by reference. The information contained in this Item 2.02, including Exhibits 99.1, and 99.2 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section nor shall it be incorporated by reference into any other filing by Delcath with the U.S. Securities and Exchange Commission whether made before or after the date hereof, regardless of any general incorporation language in such filing, except as expressly set forth by specific reference in such a filing. Item 7.01 Regulation FD Disclosure. On January 9, 2026, Delcath made available the Corporate Presentation that may be used in connection with presentations at conferences and investor meetings, which can be found on the Company’s website. The Corporate Presentation is furnished as Exhibit 99.2 and incorporated by reference in this Item 7.01. The information contained in this Item 7.01, including Exhibit 99.2, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section nor shall it be incorporated by reference into any other filing by Delcath with the U.S. Securities and Exchange Commission whether made before or after the date hereof, regardless of any general incorporation language in such filing, except as expressly set forth by specific reference in such a filing. Item 8.01 Other Events. On January 9, 2026, Delcath disclosed in the Corporate Presentation that as of December 31, 2025, (i) it had a total of 25 active sites utilizing HEPZATO KIT and (ii) there were approximately 34.7 million shares of its common stock issued and outstanding. In addition, Delcath disclosed in the Corporate Presentation that the Company achieved positive operating cash for the quarter ended December 31, 2025. On January 9, 2026, Delcath also announced the following preliminary unaudited fourth quarter and full year 2025 financial and operational results:

•

Total fourth quarter and full year revenue expected to be approximately $20.7 million and $85.2 million, respectively

•

HEPZATO KIT™ fourth quarter and full year revenue expected to be approximately $19.0 million and $78.8 million, respectively

•

CHEMOSAT® fourth quarter and full year revenue expected to be approximately $1.7 million and $6.4 million, respectively

•

628,572 shares of common stock repu

dcth-20251104FALSE000087291200008729122025-11-042025-11-04

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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): November 4, 2025

DELCATH SYSTEMS, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware001-1613306-1245881 (State or other jurisdiction of incorporation or organization)(Commission File Number)(IRS Employer Identification No.)

566 Queensbury Avenue Queensbury, NY 12804 (Address of principal executive offices) (Zip Code) (518) 743-8892 (Registrant’s telephone number, including area code) Not Applicable (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 registered pursuant to Section 12(b) of the Act:

Title of each class Trading Name of each exchange

symbol(s) on which registered

Common Stock, $.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 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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 2.02 Results of Operations and Financial Condition.

On November 4, 2025, Delcath Systems, Inc. (“Delcath”) issued a press release announcing financial results and business highlights for the quarter ended September 30, 2025 (the “Press Release”). A copy of the press release is furnished pursuant to Item 2.02 as Exhibit 99.1 hereto and is incorporated herein by reference.

The information contained in this Current Report on Form 8-K, including the Press Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended. The information contained herein and in the Press Release shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission by Delcath whether made before or after the date hereof, regardless of any general incorporation language in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.Description 99.1Press Release, dated November 4, 2025

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

SIGNATURE

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

DELCATH SYSTEMS, INC.

Date: November 4, 2025 By: /s/ Sandra Pennell Name: Sandra Pennell

Title: Chief Financial Officer