---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-067919"
form_type: "8-K"
ticker: "ACLX"
cik: "0001786205"
company_name: "Arcellx, Inc."
filed_at: "2024-03-14T23:59:59+00:00"
generated_at: "2026-06-04T21:26:26.683200+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Arcellx dismisses EY, appoints PwC as independent auditor for FY 2024

## Summary
- Board dismissed Ernst & Young as independent auditor on March 8, 2024; no disagreements on accounting principles.
- PricewaterhouseCoopers appointed as successor auditor for FY 2024; engagement letter signed March 13, 2024.
- Only reportable event was a prior material weakness in R&D expense controls, remediated as of Dec 31, 2022.
- EY agreed with disclosures; letter filed as Exhibit 16.1.

## SEC filing metadata
- accession: 0001193125-24-067919
- form_type: 8-K
- ticker: ACLX
- cik: 0001786205
- company_name: Arcellx, Inc.
- filed_at: 2024-03-14T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1786205/000119312524067919/0001193125-24-067919-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1786205/000119312524067919/d785063d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-067919
- JSON: https://secwatch.observer/filing/0001193125-24-067919.json
- Plain text: https://secwatch.observer/filing/0001193125-24-067919.txt

## Key facts
- Auditor Changes
  Arcellx, Inc. dismissed Ernst & Young LLP as its auditor.
  - Action: dismissal
  - Auditor: Ernst & Young LLP
  source text: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1786205/000119312524067919/0001193125-24-067919-index.htm
- Auditor Changes
  Arcellx, Inc. engaged PricewaterhouseCoopers LLP as its auditor.
  - Action: engagement
  - Auditor: PricewaterhouseCoopers LLP
  source text: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1786205/000119312524067919/0001193125-24-067919-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.