As of May 30, 2026, the three largest insider holders of ACLX are Peter W. Sonsini (TenPercentOwner, 4.75Mn shares), Mohamad Makhzoumi (TenPercentOwner, 4.75Mn shares), Partners 15, L.P. Nea (TenPercentOwner, 4.75Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Scott D Sandell | - | 0 | 1,622 | 27 Dec, 2022 |
| Forest Baskett | - | 0 | 4,745,262 | 22 Dec, 2022 |
| Holdings A/S Novo | - | 4,016,878 | 0 | 09 Feb, 2022 |
| Lewis T Williams | - | 0 | 2,095,114 | 09 Feb, 2022 |
| Peter W. Sonsini | - | 0 | 4,746,083 | 22 Dec, 2022 |
| Anthony A. Jr. Florence | - | 0 | 4,745,262 | 22 Dec, 2022 |
| David Charles Lubner | - | 21,659 | 0 | 20 Jan, 2026 |
| Jill Carroll | - | 0 | 2,828,394 | 15 May, 2023 |
| Rami Elghandour | - | 174,887 | 0 | 04 Mar, 2026 |
| Ali Behbahani | - | 1,925 | 2,706 | 14 Aug, 2025 |
| Enterprise Associates 15, L.P. New | - | 4,745,262 | 0 | 22 Dec, 2022 |
| Mohamad Makhzoumi | - | 283 | 4,745,262 | 22 Dec, 2022 |
| Partners 15, L.P. Nea | - | 0 | 4,745,262 | 22 Dec, 2022 |
| Christopher Heery | Chief Medical Officer | 23,749 | 0 | 14 Jan, 2026 |
| One Capital Management, Llc Sr | - | 0 | 4,487,174 | 15 May, 2023 |
| Michelle Gilson | Chief Financial Officer | 67,048 | 0 | 17 Apr, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 15 Apr, 2026 | Michelle Gilson | Common Stock | A | 36,000 | $8.66 | 64,938 | D | M |
| 15 Apr, 2026 | Michelle Gilson | Common Stock | A | 36,000 | $8.66 | 64,938 | D | M |
| 16 Apr, 2026 | Michelle Gilson | Common Stock | A | 2,110 | $8.66 | 67,048 | D | M |
| 16 Apr, 2026 | Michelle Gilson | Common Stock | A | 2,110 | $8.66 | 67,048 | D | M |
| 15 Apr, 2026 | Michelle Gilson | Stock Option (right to buy) | D | 36,000 | $0.00 | 42,315 | D | M |
| 15 Apr, 2026 | Michelle Gilson | Stock Option (right to buy) | D | 36,000 | $0.00 | 42,315 | D | M |
| 16 Apr, 2026 | Michelle Gilson | Stock Option (right to buy) | D | 2,110 | $0.00 | 40,205 | D | M |
| 16 Apr, 2026 | Michelle Gilson | Stock Option (right to buy) | D | 2,110 | $0.00 | 40,205 | D | M |
| 17 Mar, 2026 | Michelle Gilson | Common Stock | D | 5,000 | $0.00 | 28,938 | D | G |
| 17 Mar, 2026 | Michelle Gilson | Common Stock | D | 5,000 | $0.00 | 28,938 | D | G |
| 17 Mar, 2026 | Michelle Gilson | Common Stock | D | 5,000 | $0.00 | 28,938 | D | G |
| 04 Mar, 2026 | Rami Elghandour | Common Stock | D | 101,164 | $0.00 | 174,887 | D | G |
| 02 Jan, 2026 | Rami Elghandour | Common Stock | A | 55,459 | $0.00 | 673,378 | D | M |
| 03 Jan, 2026 | Rami Elghandour | Common Stock | A | 53,098 | $0.00 | 726,476 | D | M |
| 06 Jan, 2026 | Rami Elghandour | Common Stock | A | 55,991 | $0.00 | 782,467 | D | M |
| 27 Feb, 2026 | Rami Elghandour | Common Stock | D | 89,916 | $113.92 | 276,051 | D | S |
| 06 Jan, 2026 | Michelle Gilson | Common Stock | A | 20,530 | $0.00 | 64,832 | D | M |
| 06 Jan, 2026 | Michelle Gilson | Common Stock | A | 20,530 | $0.00 | 64,832 | D | M |
| 06 Jan, 2026 | Michelle Gilson | Common Stock | A | 20,530 | $0.00 | 64,832 | D | M |
| 25 Feb, 2026 | Michelle Gilson | Common Stock | D | 11,219 | $113.82 | 33,938 | D | S |