SCHEDULE 13G/A: FMR LLC and Abigail P. Johnson Disclose 11.5% Stake in ARCELLX INC

FMR LLC and Abigail P. Johnson have jointly reported a beneficial ownership of 11.5% of ARCELLX INC's common stock as of March 31, 2025.

Summary

• FMR LLC and Abigail P. Johnson have filed an Amendment No. 4 to Schedule 13G, disclosing their beneficial ownership in ARCELLX INC.
• As of March 31, 2025, the aggregate amount beneficially owned by FMR LLC and Abigail P. Johnson is 6,303,679.46 shares of ARCELLX INC's common stock.
• This ownership represents 11.5% of the total outstanding common stock of ARCELLX INC.
• FMR LLC holds sole voting power over 6,302,030.00 shares and sole dispositive power over 6,303,679.46 shares.
• Abigail P. Johnson holds sole dispositive power over 6,303,679.46 shares.
• The filing certifies that the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing the control of ARCELLX INC.
• FMR LLC is classified as a Parent Holding Company, and Abigail P. Johnson is classified as an Individual.
• Several FMR LLC subsidiaries, including Fidelity Institutional Asset Management Trust Company, Fidelity Management & Research Company LLC, and Strategic Advisers LLC, are identified as entities that beneficially own shares.

Sentiment

Score: 5

Explanation: The document is a factual disclosure of beneficial ownership and does not contain subjective information that would indicate a positive or negative sentiment regarding the issuer's performance or prospects. The certification explicitly states the holding is for ordinary course business, not control.

Positives

• Increased transparency regarding significant institutional ownership in ARCELLX INC.
• A major investment firm, FMR LLC, and its CEO, Abigail P. Johnson, holding a substantial stake may signal confidence in ARCELLX INC's long-term prospects.
• The filing explicitly states that the shares were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control, which can reduce concerns about activist investor intentions.

Risks

• While the filing states the shares are not held for control purposes, a large beneficial ownership stake by a single entity or group could still potentially exert influence over the company's direction in the future.
• Concentration of ownership, even passive, means that any future decision by this large shareholder to reduce its stake could impact stock price.

Management Comments

• "By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §§ 240.14a-11."

Industry Context

This filing reflects a standard disclosure requirement for significant beneficial ownership stakes by institutional investors in publicly traded companies. FMR LLC (Fidelity) is a major global asset manager, and its holdings are closely watched by the market. Such disclosures provide transparency into the institutional investor landscape of a company.

Stakeholder Impact

• Shareholders: Provides transparency on a significant institutional holder, potentially influencing investor confidence or perception of stability.
• Management: Awareness of a large, passive institutional holder, which may influence future investor relations strategies.

Key Dates

Keywords

ARCELLX INC, FMR LLC, Abigail P. Johnson, Schedule 13G, beneficial ownership, common stock, SEC filing, institutional investor, ownership disclosure, investment management