---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-138446"
form_type: "8-K"
ticker: "ACLX"
cik: "0001786205"
company_name: "Arcellx, Inc."
filed_at: "2023-05-08T23:59:59+00:00"
generated_at: "2026-06-15T13:55:19.682148+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Arcellx enters into $350M at-the-market equity offering agreement with Stifel

## Summary
- Arcellx may sell up to $350M of common stock through Stifel in at-the-market offerings.
- Stifel receives up to 3.0% commission on gross proceeds; company reimburses certain expenses.
- Sales are made via Nasdaq at prevailing market prices; company not obligated to sell any shares.
- Agreement filed on Form S-3ASR; shelf registration effective upon filing on May 8, 2023.
- Agreement includes customary representations, indemnification, and termination rights.

## SEC filing metadata
- accession: 0001193125-23-138446
- form_type: 8-K
- ticker: ACLX
- cik: 0001786205
- company_name: Arcellx, Inc.
- filed_at: 2023-05-08T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1786205/000119312523138446/0001193125-23-138446-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1786205/000119312523138446/d398113d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-138446
- JSON: https://secwatch.observer/filing/0001193125-23-138446.json
- Plain text: https://secwatch.observer/filing/0001193125-23-138446.txt

## Key facts
- Material Agreements
  Arcellx, Inc. entered into At-The-Market Equity Offering Sales Agreement with Stifel, Nicolaus & Company, Incorporated valued at $350,000,000 (effective 2023-05-08).
  - Action: entry
  - Agreement: atm program
  - Counterparty: Stifel, Nicolaus & Company, Incorporated
  - Value: $350,000,000
  - Effective: 2023-05-08
  source text: On May 8, 2023, Arcellx, Inc. (the "Company") entered into an At-The-Market Equity Offering Sales Agreement (the "Agreement") with Stifel, Nicolaus & Company, Incorporated ("Stifel"), pursuant to which the Company may offer and sell, from time to time through Stifel, acting as its agent, or directly to Stifel, acting as principal, shares of the Company’s common stock, par value $0.001 per share. Pursuant to the sales agreement and related prospectus the Company can sell shares of its common stock having an aggregate offering price of up to $350,000,000 (the "Shares").
  evidence_url: https://www.sec.gov/Archives/edgar/data/1786205/000119312523138446/0001193125-23-138446-index.htm

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