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Livermore
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Axcelis Technologies Inc

ACLS
Exchange
Nasdaq
Industry
Special Industry Machinery, NEC
SEC CIK
0001113232

No open-market purchases or sales by Axcelis Technologies Inc insiders were filed in the last 90 days; 442 institutions reported holding it in 13F filings for Q2 2026, worth $5.85B in total; Maverick Capital is the only superinvestor holding it.

Holders of 5% or more of ACLS

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Axcelis Technologies Inc, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of ACLS
HolderLatest formStakeChangeFirst filedLatest filingFiling
BlackRock, Inc.13G/A15.30%4.91M shares–Apr 29, 20251 filingApr 29, 2025SEC
FMR LLC13G/A13.40%4.12M shares+2.10 ppfrom 11.30%May 6, 20263 filingsAug 6, 2026SEC
Vanguard Portfolio Management LLC13G8.14%2.50M sharesNewApr 28, 20261 filingApr 28, 2026SEC
Vanguard Capital Management LLC13G5.26%1.62M sharesNewApr 29, 20261 filingApr 29, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

27 Schedule 13D and 13G filings on Axcelis Technologies Inc, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on ACLS
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 6, 202610:14 AM ETFMR LLCand 1 other13G/A13.40%4.12M shares+2.10 ppfrom 11.30%Jun 30, 2026SEC
Jul 14, 202612:51 PM ETReinhart Partners, Inc.13G/A3.00%928.7K shares−2.20 ppfrom 5.20%Below 5%Jun 30, 2026SEC
May 7, 202610:38 AM ETFMR LLCand 1 other13G/A11.30%3.48M shares+3.40 ppfrom 7.90%Apr 30, 2026SEC
May 6, 202611:00 AM ETFMR LLCand 1 other13G7.90%2.43M sharesNewMar 31, 2026SEC
Apr 29, 20265:08 PM ETVanguard Capital Management LLC13G5.26%1.62M sharesNewMar 31, 2026SEC
Apr 28, 20264:13 PM ETVanguard Portfolio Management LLC13G8.14%2.50M sharesNewMar 31, 2026SEC
Mar 26, 20264:09 PM ETVanguard Group Inc13G/A0.00%0 shares−13.52 ppfrom 13.52%Below 5%Mar 13, 2026SEC
Feb 12, 20264:05 PM ETReinhart Partners, Inc.13G5.20%1.59M sharesNewDec 31, 2025SEC
Nov 14, 20259:46 AM ETAmerican Century Investment Management Incand 2 others13G/A4.30%1.35M shares−0.90 ppfrom 5.20%Below 5%Sep 30, 2025SEC
Aug 14, 20258:56 AM ETAmerican Century Investment Management Incand 2 others13G5.20%1.66M sharesNewJun 30, 2025SEC
Apr 29, 20254:59 PM ETBlackRock, Inc.13G/A15.30%4.91M shares–Mar 31, 2025SEC
Jan 30, 20259:33 PM ETVanguard Group Inc13G/A13.52%4.40M shares–Dec 31, 2024SEC
Feb 10, 2023Senvest Management, LLC13G/AOld format–––SEC
Feb 9, 2023Vanguard Group Inc13G/AOld format–––SEC
Oct 27, 2022Senvest Management, LLC13GOld format–––SEC
Oct 7, 2022Primecap Management Co13G/AOld format–––SEC
Feb 10, 2022Primecap Management Co13G/AOld format–––SEC
Feb 9, 2022Vanguard Group Inc13G/AOld format–––SEC
Feb 9, 2022Senvest Management, LLC13G/AOld format–––SEC
Feb 8, 2022Dimensional Fund Advisors LP13G/AOld format–––SEC
Jan 28, 20221:54 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 12, 2021Primecap Management Co13G/AOld format–––SEC
Feb 12, 2021Senvest Management, LLC13G/AOld format–––SEC
Feb 12, 2021Dimensional Fund Advisors LP13G/AOld format–––SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC
Feb 4, 2021Wellington Management Group LLP13G/AOld format–––SEC
Jan 26, 20212:22 PM ETBlackRock Inc.13G/AOld format–––SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Axcelis Technologies Inc shares.

No Form 144 notices for Axcelis Technologies Inc are on file.