Axcelis Technologies ACLS Institutional Ownership

Updated Oct 11, 2026

Axcelis Technologies Inc (NASDAQ:ACLS) was held by 441 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

• Total shares held in ACLS fell 4.96% from Q1 2026; the number of holders rose 34.04% from Q2 2025.
• Of these 441 holders, 234 added to their positions, 142 reduced their stakes and 65 left their positions unchanged.
• Combined, institutional investors held 30.97Mn shares of ACLS as of Q2 2026, down 1.62Mn from the prior quarter and up 214.41K from a year earlier.
• BlackRock, Inc. was the top holder of Axcelis Technologies as of June 30, 2026, with 5.03Mn shares.
• The largest position increases in ACLS for Q2 2026 were by FMR LLC (+1.69Mn shares), Barrow Hanley Mewhinney & Strauss LLC (+392.18K shares), Invesco Ltd. (+362.65K shares), Emerald Advisers, LLC (+234.23K shares) and Emerald Mutual Fund Advisers Trust (+172.03K shares).
• The biggest cuts to ACLS positions during Q2 2026 came from Balyasny Asset Management L.P. (-748.34K shares), Reinhart Partners, LLC (-729.09K shares), American Century Companies Inc (-582.03K shares), D. E. Shaw & Co., Inc. (-411.38K shares) and LSV Asset Management (-404.9K shares).
• Per Business Quant, the top 10 investors in ACLS for the quarter ended June 30, 2026 were BlackRock, Inc. (5.03Mn shares), FMR LLC (4.13Mn shares), Vanguard Portfolio Management LLC (2.48Mn shares), Vanguard Capital Management LLC (1.39Mn shares), State Street Corp (1.23Mn shares), Victory Capital Management Inc (1.13Mn shares), Reinhart Partners, LLC (928.66K shares), Geode Capital Management, LLC (833.61K shares), BNP Paribas Asset Management Holding S.A. (803.15K shares) and Dimensional Fund Advisors LP (709.27K shares).