Axcelis Technologies Inc (ACLS) Institutional Ownership

Ownership Summary

Axcelis Technologies Inc (NASDAQ:ACLS) showed up in the 13F filings of 360 institutional investors as of December 2025.

• They owned 98.8% of outstanding stock in December 2025, up from 98.8% the prior quarter.
• They increased total shares held in Axcelis Technologies by 3.12% from the prior quarter, while the number of investors in ACLS increased 11.8% year over year.
• Of these 360 funds, 182 grew their exposure to Axcelis Technologies, 121 cut back, and 57 maintained positions.
• In total, institutional investors held 31.06Mn shares in Axcelis Technologies as of December 2025, up by 939.06K shares quarter on quarter, and down 661.54K shares year over year.
• BlackRock, Inc. is the top holder of Axcelis Technologies as of December 31, 2025, with 4.94Mn shares representing 15.7% of outstanding stock.
• The largest buyers of Axcelis Technologies for the quarter ending December 2025 were VANGUARD PORTFOLIO MANAGEMENT LLC (2.49Mn), FMR LLC (1.82Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.38Mn), BALYASNY ASSET MANAGEMENT L.P. (1.12Mn), MANUFACTURERS LIFE INSURANCE COMPANY, THE (477.7K).
• Leading sellers of Axcelis Technologies shares for the quarter ending December 2025 were Goldman Sachs Group Inc (762.0K), VICTORY CAPITAL MANAGEMENT INC (528.4K), Invesco Ltd. (313.82K), AMERICAN CENTURY COMPANIES INC (281.73K), VOLORIDGE INVESTMENT MANAGEMENT, LLC (176.47K).
• Business Quant data shows the 10 biggest positions in Axcelis Technologies as of December 2025 are held by BlackRock, Inc. (4.94Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (2.49Mn), FMR LLC (2.43Mn), REINHART PARTNERS, LLC. (1.66Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.38Mn), BALYASNY ASSET MANAGEMENT L.P. (1.36Mn), VICTORY CAPITAL MANAGEMENT INC (1.28Mn), State Street Corp (1.19Mn), BNP Paribas Asset Management Holding S.A. (1.01Mn), AMERICAN CENTURY COMPANIES INC (951.91K).