Arcellx, Inc. (ACLX) Institutional Ownership

Ownership Summary

Arcellx, Inc. (NASDAQ:ACLX) currently has 209 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

• Arcellx saw its institutional ownership percentage fell to 106.8% in December 2025 from 112.0% in September 2025.
• The company experienced a 2.02% quarterly change in institutional shares held, alongside a decrease of 0.95% in total owners annually.
• During the quarter, 112 institutions bought more Arcellx shares, 65 sold shares, and 32 of the 209 total investors held their position steady.
• The aggregate institutional position in Arcellx now stands at 60.16Mn shares as of December 2025, after investors increased their holdings (up by 1.19Mn shares quarter on quarter which is up 576.33K shares year over year).
• The top institutional stake in Arcellx as of December 31, 2025 belongs to GILEAD SCIENCES, INC., which owns 6.72Mn shares, or 11.93% of the company.
• Among the most significant buyers of Arcellx during December 2025 were Vestal Point Capital, LP (1.68Mn), Paradigm Biocapital Advisors LP (1.07Mn), JPMORGAN CHASE & CO (571.97K), Woodline Partners LP (496.44K), CITADEL ADVISORS LLC (478.77K).
• Leading sellers of Arcellx stock in December 2025 included FMR LLC (2.20Mn), RA CAPITAL MANAGEMENT, L.P. (1.77Mn), PERCEPTIVE ADVISORS LLC (1.00Mn), AJU IB Investment Co., Ltd. (824.07K), T. Rowe Price Investment Management, Inc. (698.83K).
• The top 10 institutional holders of Arcellx for the quarter ending December 2025 included GILEAD SCIENCES, INC. (6.72Mn), Paradigm Biocapital Advisors LP (5.72Mn), T. Rowe Price Investment Management, Inc. (5.65Mn), VANGUARD GROUP INC (4.08Mn), FMR LLC (3.56Mn), BlackRock, Inc. (3.55Mn), NEA Management Company, LLC (3.05Mn), Vestal Point Capital, LP (2.92Mn), SR ONE CAPITAL MANAGEMENT, LP (2.35Mn), STATE STREET CORP (2.00Mn).