Item 4.01. Changes in Registrant’s Certifying Accountant.

On October 28, 2021, the Board approved the engagement of Ernst & Young LLP (“EY”) as our independent registered public accounting firm to audit our consolidated financial statements for the year ending December 31, 2021. EY served as the independent registered public accounting firm of Holdings prior to the Transactions. Accordingly, Marcum, LLP (“Marcum”), the independent registered public accounting firm to Spartacus and Shelf prior to the Transactions, was informed that it would not be retained to serve as Spartacus’ or Shelf’s independent registered public accounting firm following completion of the Transactions.

Marcum’s report on Spartacus’ financial statements as of August 21, 2020 and for the period from August 10, 2020 (inception) through August 21, 2020 did not contain an adverse opinion or disclaimer of opinion, nor were such reports qualified or modified as to uncertainty, audit scope, or accounting principles, except that such audit report dated August 31, 2020 contained an explanatory paragraph in which Marcum expressed substantial doubt as to Spartacus’ ability to continue as a going concern. Marcum’s report on Spartacus’ financial statements as of December 31, 2020, and for the period from August 10, 2020 (inception) through December 31, 2020, dated March 23, 2021 except for the effects of the restatement discussed in Notes 2, 3 and 9 as to which the date is May 12, 2021, did not contain an adverse opinion or disclaimer of opinion, nor were such reports qualified or modified as to uncertainty, audit scope, or accounting principles. Marcum’s report on Shelf’s financial statements as of May 31, 2021 and for the period from May 21, 2021 (inception) through May 31, 2021 did not contain an adverse opinion or disclaimer of opinion, nor were such reports qualified or modified as to uncertainty, audit scope, or accounting principles, except that such audit report dated June 15, 2021 contained an explanatory paragraph in which Marcum expressed substantial doubt as to Shelf’s ability to continue as a going concern.

During the period from August 10, 2020 (inception) through September 30, 2021 and the subsequent interim period preceding the engagement of EY, neither Spartacus nor Shelf consulted EY regarding either: (i) the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on Spartacus’ or Shelf’s financial statements, and no written report or oral advice was provided to Spartacus or Shelf by EY that EY concluded was an important factor considered by Spartacus or Shelf in reaching a decision as to the accounting, auditing or financial reporting issue; or (ii) any matter that was the subject of a disagreement (as described in Item 304(a)(1)(iv) of Regulation S-K) or a “reportable event” (as described in Item 304(a)(1)(v) of Regulation S-K).

During the period of Marcum’s engagement by Spartacus and Shelf, and the subsequent interim period until Marcum’s dismissal, there were no disagreements with Marcum on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which disagreements if not resolved to the satisfaction of Marcum, would have caused it to make a reference to the subject matter of the disagreement in connection with its reports covering such periods. In addition, no “reportable events,” as defined in Item 304(a)(1)(v) of Regulation S-K, occurred within the period of Marcum’s engagement and the subsequent interim period until Marcum’s dismissal, except for a material weakness in Spartacus’ internal control over financial reporting related to the accounting for warrants issued by Spartacus.

We provided Marcum with a copy of the disclosures made pursuant to this Item 4.01 prior to the filing of this Report and requested that Marcum furnish letters addressed to the Securities & Exchange Commission, which are attached hereto as Exhibit 16.1 and Exhibit 16.2, stating whether it agrees with such disclosures, and, if not, stating the respects in which it does not agree.