Arcellx, Inc. (ACLX) Institutional Ownership

Ownership Summary

Arcellx, Inc. (NASDAQ:ACLX) has 214 institutional investors that have filed 13F reports for the period ending December 2025.

• Their combined ownership stood at 124.6% of outstanding shares in December 2025, up from 113.3% in September 2025.
• They increased total shares held in ACLX by 17.33% quarter over quarter, and investors in Arcellx increased 2.39% from a year ago.
• Of these 214 funds, 113 grew their exposure to Arcellx, 69 cut back, and 32 maintained positions.
• Altogether, these fund groups held 70.53Mn shares in ACLX by December 2025, up by 10.42Mn shares quarter on quarter, and up 10.06Mn shares year over year.
• Gilead Sciences, Inc. holds the largest position in ACLX at 6.72Mn shares as of December 31, 2025, or 11.88% of shares outstanding.
• Leading buyers of Arcellx shares for the quarter ending December 2025 were Pentwater Capital Management LP (2.87Mn), VANGUARD CAPITAL MANAGEMENT LLC (2.43Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (2.42Mn), FIL Ltd (2.34Mn), HBK INVESTMENTS L P (2.28Mn).
• The largest sellers of Arcellx for the quarter ending December 2025 were T. Rowe Price Investment Management, Inc. (13.96Mn), FMR LLC (3.44Mn), CITADEL ADVISORS LLC (1.48Mn), Jpmorgan Chase & Co (860.9K), Janus Henderson Group Plc (739.02K).
• According to Business Quant data, leading holders of ACLX for December 2025 are Gilead Sciences, Inc. (6.72Mn), Paradigm Biocapital Advisors LP (5.77Mn), BlackRock, Inc. (3.95Mn), NEA Management Company, LLC (3.05Mn), Pentwater Capital Management LP (2.87Mn), VANGUARD CAPITAL MANAGEMENT LLC (2.43Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (2.42Mn), SR ONE CAPITAL MANAGEMENT, LP (2.35Mn), FIL Ltd (2.34Mn), HBK INVESTMENTS L P (2.28Mn).