Axcelis Technologies ACLS Insider Ownership

NASDAQ ACLS
$142.31 -5.46 (-3.69%)
At close: Oct 5, 2026 · 4:00 PM EDT

Insider Holdings by Owner

800.35K Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
1.48%
▼-0.0017% pp QoQ
Shares Held by Insiders
455.95K
filed for Sep 2026
▼-0.11% QoQ
Shares Outstanding
30.81Mn
30,805,000 shares
Direct Holdings
455.95K
Indirect: 0
Net Shares Traded (QoQ)
-509
net selling in Sep 2026
Insiders Holding Shares
24
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

In the last 12 months, insiders at Axcelis Technologies made open-market sales of $6.42 million (45.37K shares) and bought no shares on the open market.

Form 4 Holdings

Insiders Holding ACLS

Insiders 24
Shares held 800.35K
Of outstanding 2.60%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Mary G Puma Executive Chairperson 231,976 0 231,976 29.0% 09 May, 2024
2 Russell Low President And Ceo 154,900 0 154,900 19.4% 20 May, 2026
3 James Gordon Coogan Evp And Cfo 37,144 0 37,144 4.6% 03 Mar, 2026
4 Greg Redinbo Evp And Chief Strategy Officer 34,816 0 34,816 4.4% 16 Sep, 2026
5 Richard J Faubert Director 33,625 0 33,625 4.2% 12 Aug, 2022
6 John T Kurtzweil Director 32,990 0 32,990 4.1% 20 May, 2026
7 Eileen Evans Evp, General Counsel And Sec'Y 31,295 0 31,295 3.9% 22 May, 2026
8 William J Bintz Evp, Product Development 31,173 0 31,173 3.9% 23 Nov, 2022
9 Christopher Tatnall Evp Global Customer Operations 27,491 0 27,491 3.4% 16 Sep, 2026
10 Lynnette C Fallon Executive Vp, Hr/Legal 27,323 0 27,323 3.4% 07 Jan, 2025
11 Gerald M Blumenstock Evp, Research, Dev. Eng. 19,987 0 19,987 2.5% 16 Jun, 2026
12 Kevin J Brewer Evp Chief Financial Officer 19,597 0 19,597 2.4% 02 Jan, 2024
13 Dennis Thomas St Director 17,695 0 17,695 2.2% 26 May, 2026
14 Douglas A. Lawson Evp, Corporate Mktg Strategy 15,808 0 15,808 2.0% 24 Jun, 2024
15 Robert John Mahoney Evp Global Operations 14,410 0 14,410 1.8% 03 Jun, 2026
16 Tzu Yin Chiu Director 11,843 0 11,843 1.5% 18 May, 2026
17 Jeanne Quirk Director 11,400 0 11,400 1.4% 20 May, 2026
18 David Ryzhik Svp Interim Cfo 9,790 0 9,790 1.2% 17 Jul, 2026
19 Dipti Vachani Director 9,063 0 9,063 1.1% 16 May, 2024
20 Necip Sayiner Director 7,112 0 7,112 0.9% 04 Jun, 2026
21 Todd Sutton Vp Corporate Controller 6,360 0 6,360 0.8% 28 May, 2026
22 Jorge Titinger Director 5,917 0 5,917 0.7% 18 May, 2026
23 Gregory B Graves Director 5,473 0 5,473 0.7% 20 May, 2026
24 Joseph P Keithley Director 3,157 0 3,157 0.4% 14 Dec, 2023

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

1,442 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
15 Jul, 2026 David Ryzhik Svp Interim Cfo Disposed F 127 $145.01 $18.42K 9,884 Direct
15 Jul, 2026 David Ryzhik Svp Interim Cfo Disposed F 94 $145.01 $13.63K 9,790 Direct
16 Jun, 2026 David Ryzhik Svp Interim Cfo Disposed F 76 $176.85 $13.44K 9,955 Direct
15 Jun, 2026 Gerald M Blumenstock Evp, Research, Dev. Eng. Disposed F 506 $191.60 $96.95K 19,987 Direct
03 Jun, 2026 Necip Sayiner Director Disposed S 1,586 $157.44 $249.70K 7,112 Direct
02 Jun, 2026 Robert John Mahoney Evp Global Operations Disposed S 1,155 $155.24 $179.30K 14,410 Direct
27 May, 2026 Todd Sutton Vp Corporate Controller Disposed S 2,000 $159.99 $319.98K 6,360 Direct
22 May, 2026 Dennis Thomas St Director Disposed S 900 $155.37 $139.83K 17,695 Direct
22 May, 2026 Eileen Evans Evp, General Counsel And Sec'Y Disposed S 926 $155.51 $144.00K 31,295 Direct
21 May, 2026 Gerald M Blumenstock Evp, Research, Dev. Eng. Disposed S 1,161 $152.70 $177.28K 20,493 Direct
20 May, 2026 Christopher Tatnall Evp Global Customer Operations Disposed S 1,166 $149.75 $174.61K 27,627 Direct
18 May, 2026 Russell Low President And Ceo Disposed F 711 $146.24 $103.98K 154,900 Direct
18 May, 2026 Robert John Mahoney Evp Global Operations Disposed F 182 $146.24 $26.62K 15,695 Direct
19 May, 2026 Gregory B Graves Director Disposed S 2,625 $141.41 $371.19K 6,073 Direct
18 May, 2026 Todd Sutton Vp Corporate Controller Disposed F 184 $146.24 $26.91K 8,360 Direct
18 May, 2026 Greg Redinbo Evp Marketing And Applications Disposed F 111 $146.24 $16.23K 35,103 Direct
19 May, 2026 Jeanne Quirk Director Disposed S 1,789 $140.22 $250.85K 11,400 Direct
19 May, 2026 John T Kurtzweil Director Disposed S 3,500 $138.79 $485.77K 32,990 Direct
18 May, 2026 Greg Redinbo Evp Marketing And Applications Disposed F 79 $146.24 $11.55K 35,024 Direct
19 May, 2026 Gregory B Graves Director Disposed S 600 $142.51 $85.51K 5,473 Direct