DELCATH SYSTEMS INC

Rule 10b5-1 Trading Plans

During the three months ended September 30, 2024, no Section 16 officers and directors adopted, modified orterminated a “Rule 10b5-1 trading arrangement” (as defined in Item 408 of Regulation S-K of the Exchange Act).

There were no “non-Rule 10b5-1 trading arrangements” as defined in Item 408 of Regulation S-K of the Exchange Actadopted, modified orterminated during the three months ended September 30, 2024 by our Section 16 officers or directors.

CBIZ Acquisition of Marcum LLP

On November 1, 2024, CBIZ, Inc. acquired substantially all of the non-attest assets of Marcum LLP. In a separate transaction, CBIZ CPAs P.C., a national independent certified public accounting firm with which CBIZ Inc. has an existing Administrative Services Agreement, purchased from Marcum LLP substantially all of Marcum’s attest business assets. On August 2, 2024, Marcum LLP informed the Company that it would not be independent with respect to the completion of the fiscal year ended December 31, 2024, audit of the consolidated financial statements as a result of certain non-attest services that were performed by CBIZ, Inc. (stock warrants valuation) during the period under audit for the Company. For the following reasons, the Audit Committee of the Board of Directors of the Company and Marcum have each concluded, and are of the view that a reasonable investor with knowledge of all relevant facts and circumstances would conclude, that the provision of these services did not impair Marcum LLP’s objectivity and impartiality with respect to Marcum LLP’s audit of the Company’s consolidated financial statements:

1. All of the valuation work performed by CBIZ, Inc. was prior to July 31, 2024, when the proposed transaction between CBIZ, Inc. and Marcum LLP was announced. The audit engagement team was not aware of this proposed transaction prior to July 31st. The Marcum audit partner became aware on July 30th evening from a Partner meeting which was convened by the Marcum CEO.

2. CBIZ, Inc. services did not involve decision making and supervisory responsibilities over and on behalf of the Company management.

3. The Company terminated CBIZ, Inc.’s engagement soon after being notified of this conflict and hired an unrelated third party to perform the September 30, 2024, valuation and to independently reperform the June 30, 2024, valuation. The unrelated third party developed the fair value estimates independent from CBIZ, Inc. and developed its methodology from inputs and assumptions provided by the Company and in consultation with the Company management.

4. No personnel from CBIZ, Inc. who worked on the Company’s engagement will be part of the audit team or have any involvement in the audit.

5. The fee earned by CBIZ, Inc. for the non-attest services is insignificant to CBIZ, Inc., and the Company.