Form 4: Arcellx CMO Sells Shares for Tax Obligations

Arcellx's Chief Medical Officer, Christopher Heery, sold 6,131 shares of common stock to cover tax withholding obligations related to RSU vesting.

Summary

• Christopher Heery, Arcellx's Chief Medical Officer, acquired 13,021 shares of common stock on January 2, 2026, through the vesting of restricted stock units (RSUs).
• On January 12, 2026, Mr. Heery sold 6,131 shares of Arcellx common stock at a weighted average price of $64.1471 per share.
• The sale was a broker-assisted transaction specifically to satisfy tax withholding obligations associated with the RSU vesting.
• Following these transactions, Mr. Heery directly beneficially owns 37,068 shares of Arcellx common stock.

Sentiment

Score: 5

Explanation: The filing reports a routine insider transaction involving the sale of shares to cover tax obligations from RSU vesting, which is a neutral event and does not indicate a change in sentiment towards the company.

Future Outlook

NA

Industry Context

NA

Related Party Transactions

• Christopher Heery, Chief Medical Officer, engaged in a transaction involving the sale of company stock, which is a related party transaction as he is an insider.

Stakeholder Impact

• Minimal direct impact on shareholders as the transaction is a routine tax-related sale by an executive and not indicative of a change in company fundamentals or executive confidence.

Key Dates

Keywords

Arcellx, ACLX, Christopher Heery, Chief Medical Officer, Form 4, insider trading, RSU vesting, stock sale, tax withholding, beneficial ownership