As of September 29, 2026, the three largest insider holders of ACET are Capital Management, L.P. Ra (TenPercentOwner, 932.62K shares), Andrew Sinclair (Director, 18.89K shares), Carl L Gordon (Director, 11.21K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Capital Management, L.P. Ra | TenPercentOwner | 0 | 932,624 | 932,624 | 97.6% | 29 Apr, 2026 |
| 2 | Chen Schor | President Ceo | 6,820 | 0 | 6,820 | 0.7% | 27 Jan, 2026 |
| 3 | Brian Nicholas Harvey | Chief Financial Officer | 5,145 | 0 | 5,145 | 0.5% | 27 Jan, 2026 |
| 4 | Don Healey | Chief Technology Officer | 3,452 | 0 | 3,452 | 0.4% | 27 Jan, 2026 |
| 5 | Blake Aftab | Chief Scientific Officer | 2,981 | 0 | 2,981 | 0.3% | 27 Jan, 2026 |
| 6 | Advisors Llc Orbimed | Director, TenPercentOwner | 0 | 2,163 | 2,163 | 0.2% | 14 Dec, 2021 |
| 7 | Lloyd Klickstein | Chief Innovation Officer | 969 | 0 | 969 | 0.1% | 13 Jun, 2025 |
| 8 | Francesco Galimi | Svp Chief Medical Officer | 909 | 0 | 909 | 0.1% | 26 Jan, 2024 |
| 9 | Steve Dubin | Director | 203 | 0 | 203 | 0.0% | 13 Jun, 2025 |
| 10 | Jeffrey Chodakewitz | Director | 158 | 0 | 158 | 0.0% | 13 Jun, 2025 |
| 11 | Andrew Sinclair | Director | 158 | 0 | 158 | 0.0% | 13 Jun, 2025 |
| 12 | Katie Peng | Director | 105 | 0 | 105 | 0.0% | 13 Jun, 2025 |
| 13 | Carl L Gordon | Director, TenPercentOwner | 105 | 0 | 105 | 0.0% | 07 Jun, 2024 |
| 14 | Aya Jakobovits | Director | 105 | 0 | 105 | 0.0% | 07 Jun, 2024 |
| 15 | Bastiano Sanna | Director | 53 | 0 | 53 | 0.0% | 02 Jun, 2023 |
| 16 | Michael Kauffman | Director | 53 | 0 | 53 | 0.0% | 07 Jun, 2024 |
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 |
|---|---|---|---|---|---|---|---|---|
| 05 Aug, 2026 | Lloyd Klickstein | Chief Medical Officer | Acquired A | 18,300 | $0.00 | $0 | 18,300 | Direct |
| 21 Jun, 2026 | Lloyd Klickstein | Director | Acquired A | 4,200 | $0.00 | $0 | 4,200 | Direct |
| 21 Jun, 2026 | Michael Grissinger | Director | Acquired A | 4,200 | $0.00 | $0 | 4,200 | Direct |
| 21 Jun, 2026 | Jeffrey Chodakewitz | Director | Acquired A | 4,200 | $0.00 | $0 | 4,200 | Direct |
| 19 Jun, 2026 | Blake Aftab | Chief Scientific Officer | Acquired A | 55,000 | $0.00 | $0 | 55,000 | Direct |
| 21 Jun, 2026 | Andrew Sinclair | Director | Acquired A | 4,200 | $0.00 | $0 | 4,200 | Direct |
| 21 Jun, 2026 | Steve Dubin | Director | Acquired A | 4,200 | $0.00 | $0 | 4,200 | Direct |
| 21 Jun, 2026 | Katie Peng | Director | Acquired A | 4,200 | $0.00 | $0 | 4,200 | Direct |
| 19 Jun, 2026 | Chen Schor | President Ceo | Acquired A | 55,000 | $0.00 | $0 | 55,000 | Direct |
| 27 Apr, 2026 | Capital Management, L.P. Ra | TenPercentOwner | Disposed J | 250,000 | — | — | 932,624 | Indirect |
| 27 Apr, 2026 | Capital Management, L.P. Ra | TenPercentOwner | Acquired J | 250,000 | — | — | 1,402,833 | Indirect |
| 18 Feb, 2026 | Capital Management, L.P. Ra | TenPercentOwner | Acquired P | 74,577 | $7.04 | $525.02K | 1,033,605 | Indirect |
| 19 Feb, 2026 | Capital Management, L.P. Ra | TenPercentOwner | Acquired P | 74,268 | $7.21 | $535.47K | 1,107,873 | Indirect |
| 20 Feb, 2026 | Capital Management, L.P. Ra | TenPercentOwner | Acquired P | 74,751 | $7.27 | $543.44K | 1,182,624 | Indirect |
| 07 Apr, 2026 | Advisors Llc Orbimed | TenPercentOwner | Disposed S | 29,319 | $6.53 | $191.45K | 34,923 | Indirect |
| 07 Apr, 2026 | Advisors Llc Orbimed | TenPercentOwner | Disposed S | 2,400 | $6.38 | $15.31K | 32,523 | Indirect |
| 08 Apr, 2026 | Advisors Llc Orbimed | TenPercentOwner | Disposed S | 32,523 | $6.29 | $204.57K | 0 | Indirect |
| 08 Apr, 2026 | Advisors Llc Orbimed | TenPercentOwner | Disposed S | 40,416 | $6.52 | $263.51K | 0 | Indirect |
| 25 Mar, 2026 | Brian Nicholas Harvey | Chief Financial Officer | Acquired A | 43,361 | $0.00 | $0 | 43,361 | Direct |
| 25 Mar, 2026 | Don Healey | Chief Technology Officer | Acquired A | 43,361 | $0.00 | $0 | 43,361 | Direct |