As of September 09, 2026, the three largest insider holders of ACLS are Russell Low (President And Ceo, 123.57K shares), Greg Redinbo (Evp Marketing And Applications, 35.02K shares), Richard J Faubert (Director, 33.62K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Russell Low | President And Ceo | 123,570 | 0 | 123,570 | 26.8% | 07 May, 2026 |
| 2 | Greg Redinbo | Evp Marketing And Applications | 35,024 | 0 | 35,024 | 7.6% | 20 May, 2026 |
| 3 | Richard J Faubert | Director | 33,625 | 0 | 33,625 | 7.3% | 12 Aug, 2022 |
| 4 | John T Kurtzweil | Director | 32,990 | 0 | 32,990 | 7.2% | 20 May, 2026 |
| 5 | Eileen Evans | Evp, General Counsel And Sec'Y | 31,295 | 0 | 31,295 | 6.8% | 22 May, 2026 |
| 6 | William J Bintz | Evp, Product Development | 31,173 | 0 | 31,173 | 6.8% | 23 Nov, 2022 |
| 7 | Christopher Tatnall | Evp Global Customer Operations | 27,627 | 0 | 27,627 | 6.0% | 21 May, 2026 |
| 8 | Lynnette C Fallon | Executive Vp, Hr/Legal | 27,323 | 0 | 27,323 | 5.9% | 07 Jan, 2025 |
| 9 | Gerald M Blumenstock | Evp, Research, Dev. Eng. | 19,987 | 0 | 19,987 | 4.3% | 16 Jun, 2026 |
| 10 | Douglas A. Lawson | Evp, Corporate Mktg Strategy | 15,808 | 0 | 15,808 | 3.4% | 24 Jun, 2024 |
| 11 | Robert John Mahoney | Evp Global Operations | 14,410 | 0 | 14,410 | 3.1% | 03 Jun, 2026 |
| 12 | Tzu Yin Chiu | Director | 11,843 | 0 | 11,843 | 2.6% | 18 May, 2026 |
| 13 | Jeanne Quirk | Director | 11,400 | 0 | 11,400 | 2.5% | 20 May, 2026 |
| 14 | David Ryzhik | Svp Interim Cfo | 9,790 | 0 | 9,790 | 2.1% | 17 Jul, 2026 |
| 15 | Dipti Vachani | Director | 9,063 | 0 | 9,063 | 2.0% | 16 May, 2024 |
| 16 | Necip Sayiner | Director | 8,698 | 0 | 8,698 | 1.9% | 18 May, 2026 |
| 17 | Todd Sutton | Vp Corporate Controller | 6,360 | 0 | 6,360 | 1.4% | 28 May, 2026 |
| 18 | Jorge Titinger | Director | 5,917 | 0 | 5,917 | 1.3% | 18 May, 2026 |
| 19 | Gregory B Graves | Director | 5,473 | 0 | 5,473 | 1.2% | 20 May, 2026 |
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.
| 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 |
| 21 May, 2026 | Gerald M Blumenstock | Evp, Research, Dev. Eng. | Disposed S | 1,161 | $152.70 | $177.28K | 20,493 | Direct |
| 22 May, 2026 | Eileen Evans | Evp, General Counsel And Sec'Y | Disposed S | 926 | $155.51 | $144.00K | 31,295 | Direct |
| 20 May, 2026 | Christopher Tatnall | Evp Global Customer Operations | Disposed S | 1,166 | $149.75 | $174.61K | 27,627 | Direct |
| 19 May, 2026 | Jeanne Quirk | Director | Disposed S | 1,789 | $140.22 | $250.85K | 11,400 | Direct |
| 19 May, 2026 | Gregory B Graves | Director | Disposed S | 2,625 | $141.41 | $371.19K | 6,073 | Direct |
| 19 May, 2026 | John T Kurtzweil | Director | Disposed S | 3,500 | $138.79 | $485.77K | 32,990 | Direct |
| 18 May, 2026 | Todd Sutton | Vp Corporate Controller | Disposed F | 184 | $146.24 | $26.91K | 8,360 | Direct |
| 18 May, 2026 | Robert John Mahoney | Evp Global Operations | Disposed F | 182 | $146.24 | $26.62K | 15,695 | Direct |
| 18 May, 2026 | Greg Redinbo | Evp Marketing And Applications | Disposed F | 111 | $146.24 | $16.23K | 35,103 | Direct |
| 18 May, 2026 | Greg Redinbo | Evp Marketing And Applications | Disposed F | 79 | $146.24 | $11.55K | 35,024 | Direct |
| 18 May, 2026 | Robert John Mahoney | Evp Global Operations | Disposed F | 130 | $146.24 | $19.01K | 15,565 | Direct |
| 19 May, 2026 | Gregory B Graves | Director | Disposed S | 600 | $142.51 | $85.51K | 5,473 | Direct |