SCHEDULE 13D/A: Arcellx Executive Rami Elghandour Updates Beneficial Ownership, Discloses Tax-Related Stock Sales

Rami Elghandour, a key executive at Arcellx, Inc., has updated his beneficial ownership stake to 6.9% following the partial vesting of performance-based equity awards and subsequent sales to cover tax obligations.

Summary

• Rami Elghandour, the Reporting Person, beneficially owns an aggregate of 3,997,132 shares of Arcellx, Inc. common stock, representing 6.9% of the Issuer's outstanding shares.
• This beneficial ownership calculation is based on 54,944,012 shares outstanding as of February 27, 2025, plus 2,832,275 shares issuable from options exercisable within 60 days.
• The compensation committee of Arcellx's board determined that performance criteria for Mr. Elghandour's June 9, 2021, and January 3, 2023, awards were partially satisfied as of December 31, 2024.
• This resulted in the vesting of 668,416 shares from the 2021 award and 347,255 shares from the 2023 award.
• Mr. Elghandour conducted several broker-assisted sales of Common Stock between January 3, 2025, and February 26, 2025, totaling 98,834 shares, specifically to satisfy tax withholding obligations related to the vesting of restricted stock units.
• The weighted-average sales prices for these transactions ranged from $79.55 to $62.02 per share.

Sentiment

Score: 7

Explanation: The sentiment is moderately positive. The primary positive is the vesting of significant performance-based equity awards, indicating the company met certain internal targets. While there were insider sales, they were explicitly stated as being for tax withholding purposes, which is a neutral to slightly negative event, but not indicative of a lack of confidence in the company.

Positives

• The partial satisfaction of performance criteria for equity awards indicates that Arcellx met certain operational or financial milestones, leading to the vesting of a significant number of shares for the Reporting Person.
• The vesting of 1,015,671 shares (668,416 + 347,255) demonstrates the company's performance against pre-defined targets.

Negatives

• The sale of 98,834 shares by a key executive, even for tax purposes, could be perceived negatively by some investors as it reduces insider ownership, although it is a common practice.

Future Outlook

The document notes that the unvested portions of the performance-based awards remain outstanding, implying potential future vesting events contingent on continued performance.

Industry Context

This filing is a routine disclosure of insider ownership changes and compensation-related transactions, which are common across all industries, particularly in high-growth sectors like biotechnology where equity compensation is prevalent. It does not provide specific insights into broader industry trends or competitive landscape.

Stakeholder Impact

• Shareholders: The change in beneficial ownership and the insider sales provide transparency regarding executive holdings and compensation practices. The vesting of performance awards could be seen as a positive signal regarding company performance.
• Employees (specifically Rami Elghandour): The vesting of awards represents a significant compensation event, reflecting the achievement of performance milestones.

Next Steps

• The unvested portions of the June 9, 2021, and January 3, 2023, awards remain outstanding and may vest in the future based on applicable award agreements and performance criteria.

Key Dates

Keywords

Arcellx Inc., Rami Elghandour, Schedule 13D/A, Beneficial Ownership, Insider Trading, Stock Options, Restricted Stock Units, Equity Awards, Tax Withholding, Common Stock