8-K

Arcellx, Inc.

Date: March 14, 2024

/s/ Rami Elghandour

Rami Elghandour

Chief Executive Officer

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): March 8, 2024

Arcellx, Inc.

(Exact name of Registrant as Specified in Its Charter)


Delaware	001-41259	47-2855917
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

800 Bridge Parkway

Redwood City, CA 94065

(Address of principal executive offices, including zip code)

(240) 327-0603

(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, $0.001 par value per share	ACLX	The Nasdaq Stock Market LLC

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 4.01 Changes in Registrant’s Certifying Accountant.

(a) Dismissal of Independent Registered Public Accounting Firm

On March 8, 2024, the Board of Directors (the “Board”) of Arcellx, Inc. (the “Company”), upon the recommendation of the Audit Committee of the Board (the “Audit Committee”), approved the dismissal of Ernst & Young LLP (“EY”) as the Company’s independent registered public accounting firm. The dismissal was not related to any disagreements with EY on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure.

The reports of EY on the consolidated financial statements of the Company as of and for the fiscal years ended December 31, 2023 and 2022 did not contain an adverse opinion or a disclaimer of opinion and were not qualified or modified as to uncertainty, audit scope, or accounting principles.

During the fiscal years ended December 31, 2023 and 2022 and during the interim period through March 8, 2024, there were (i) no disagreements within the meaning of Item 304(a)(1)(iv) of Regulation S-K between the Company and EY on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, any of which, if not resolved to EY’s satisfaction, would have caused EY to make reference thereto in their reports, and (ii) no “reportable events” within the meaning of Item 304(a)(1)(v) of Regulation S-K, except for the material weakness in the Company’s internal control over financial reporting as of March 31, 2022 and June 30, 2022, as previously reported in the Company’s Current Report on Form 8-K, filed with the Securities and Exchange Commission (“SEC”) on November 9, 2022, with respect to Company management’s controls over the accounting for research and development expense and related accounts for the quarterly periods ended March 31, 2022 and June 30, 2022. This material weakness was remediated as of December 31, 2022, as previously reported in the Company’s Annual Report on Form 10-K, filed with the SEC on March 29, 2023. This reportable event was discussed among the Audit Committee and EY. EY has been authorized by the Company to respond fully to the inquiries of PricewaterhouseCoopers LLP (“PwC”), the successor independent registered public accounting firm, concerning this reportable event.

The Company provided EY with a copy of the disclosures it is making in this Current Report on Form 8-K and requested that EY furnish the Company with a letter addressed to the Securities and Exchange Commission stating whether it agrees with the statements made herein and, if not, stating the respects in which it does not agree. A copy of such letter provided by EY, dated March 14, 2024, is filed as Exhibit 16.1 to this Current Report on Form 8-K.

(b) Appointment of New Independent Registered Public Accounting Firm

On March 8, 2024, the Board, upon the recommendation of the Audit Committee, approved the engagement of PwC as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2024, subject to PwC’s customary client acceptance procedures and the execution of an engagement letter. On March 13, 2024, the Company executed an engagement letter with PwC.

During the Company’s two most recent fiscal years ended December 31, 2023 and 2022 and during the interim period through March 8, 2024, neither the Company nor anyone acting on its behalf consulted with PwC regarding any of the matters described in Items 304(a)(2)(i) and (ii) of Regulation S-K.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.


Exhibit No.		Description

16.1		Letter from Ernst & Young LLP, dated March 14, 2024

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.