Arcellx, Inc. (ACLX) Institutional Ownership

Ownership Summary

Arcellx, Inc. (NASDAQ:ACLX) is held by 214 institutional investors per 13F filings through 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 Arcellx by 17.33% from last quarter, and the number of investors in ACLX increased 2.39% annually.
• Activity in ACLX broke down as 113 buyers, 69 sellers, and 32 unchanged among 214 total holders.
• 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. is the top holder of Arcellx as of December 31, 2025, with 6.72Mn shares representing 11.88% of outstanding stock.
• Top purchasers of ACLX stock for the quarter ending December 2025 included 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).
• Top sellers of ACLX stock for the quarter ending December 2025 included 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).