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Axcelis Technologies ACLS

US equityMarket cap rank #2205
$142.31 −$5.46 (-3.69%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $143.00 +0.48%
Open$147.77
Prev close$147.77
Day range$141.95 – $147.91
Volume372.7K
Market cap$4.39B
P/E (TTM)47.8
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership103.8%+0.06 pts vs. prior quarter
Institutions holding503-1 vs. prior quarter
Insider trades (recent)15 buys / 35 sellsNet selling
Short interest4.65% of floatDays to cover 4.5 · as of 15 Sep 2026
Short-sale volume share16.0%5-day average of daily volume

Short-sale volume as % of daily volume

7%14%21%28%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$3.66M (7 inflow days, 13 outflow days).

The five largest holders on file together own 46.8% of shares outstanding.

Largest holders

  • BlackRock16.29%
  • FMR13.34%
  • Vanguard Portfolio Management, LLC8.03%
  • Vanguard Capital Management, LLC5.20%
  • State Street Global Advisors3.99%
  • Victory Capital Management Inc.3.67%
  • Reinhart Partners, LLC3.01%
  • Geode Capital Management, LLC2.70%

By investor type

  • Mutual Fund93.85%
  • Hedge Fund5.08%
  • Public Company2.26%
  • Government Pension Fund1.42%
  • Private Company0.64%
  • Individual/Insider0.63%
  • Family Office/Trust0.25%
  • Insurance Company0.19%

Reported short interest has fallen from 6.18% to 4.65% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 1,434,982 4.6% 4.5
31 Aug 2026 1,625,367 5.3% 5.3
14 Aug 2026 1,682,955 5.4% 4.1
31 Jul 2026 1,612,811 5.2% 4.0
15 Jul 2026 1,769,809 5.8% 3.1
30 Jun 2026 1,899,085 6.2% 2.7

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