---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-22-157549"
form_type: "8-K"
ticker: "ACLX"
cik: "0001786205"
company_name: "Arcellx, Inc."
filed_at: "2022-05-23T23:59:59+00:00"
generated_at: "2026-06-25T08:18:46.081015+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Arcellx appoints Michelle Gilson as CFO effective May 23, replacing interim CFO

## Summary
- Michelle Gilson named CFO, principal financial and accounting officer, effective May 23, 2022.
- Prior role: Managing Director and Senior Equity Research Analyst at Canaccord Genuity covering biotech.
- Annual base salary of $420,000; eligible for annual bonus up to 40% of base salary.
- Granted option to purchase 103,515 shares (4-year vest) and 67,285 RSUs (3-year vest).
- Severance agreement provides 18-month salary and bonus upon qualifying change-in-control termination.

## SEC filing metadata
- accession: 0001193125-22-157549
- form_type: 8-K
- ticker: ACLX
- cik: 0001786205
- company_name: Arcellx, Inc.
- filed_at: 2022-05-23T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1786205/000119312522157549/0001193125-22-157549-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1786205/000119312522157549/d334887d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-22-157549
- JSON: https://secwatch.observer/filing/0001193125-22-157549.json
- Plain text: https://secwatch.observer/filing/0001193125-22-157549.txt

## Key facts
- Executive change
  Lance Thibault departed as interim Chief Financial Officer at Arcellx, Inc..
  - Action: ceased to be interim Chief Financial Officer
  - Role: interim Chief Financial Officer
  source text: On the Effective Date, Lance Thibault, who has served as the Company’s interim Chief Financial Officer since January 2022, will cease to be the interim Chief Financial Officer of the Company.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1786205/000119312522157549/0001193125-22-157549-index.htm
- Executive change
  Michelle Gilson was appointed as Chief Financial Officer at Arcellx, Inc..
  - Action: appointed
  - Role: Chief Financial Officer
  source text: On May 20, 2022, Arcellx, Inc. (the “ Company ”) appointed Michelle Gilson as its Chief Financial Officer, effective May 23, 2022
  evidence_url: https://www.sec.gov/Archives/edgar/data/1786205/000119312522157549/0001193125-22-157549-index.htm

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