As of August 29, 2026, the three largest insider holders of ZNTL are Group Walters (TenPercentOwner, 17.84Mn shares), Capital Management Company, Lp Matrix (TenPercentOwner, 6.46Mn shares), Anthony Y Sun (President Ceo, 1.18Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Group Walters | TenPercentOwner | 17,844,973 | 0 | 17,844,973 | 56.2% | 19 Aug, 2026 |
| 2 | Capital Management Company, Lp Matrix | TenPercentOwner | 0 | 6,459,973 | 6,459,973 | 20.3% | 15 Dec, 2025 |
| 3 | Anthony Y Sun | President Ceo | 1,175,589 | 0 | 1,175,589 | 3.7% | 05 Apr, 2022 |
| 4 | Andrea Paul | Chief Legal Officer | 1,070,784 | 0 | 1,070,784 | 3.4% | 05 Feb, 2025 |
| 5 | Kevin D. Bunker | Chief Scientific Officer | 834,931 | 0 | 834,931 | 2.6% | 21 Dec, 2023 |
| 6 | Cam Gallagher | President, Interim Cfo | 633,680 | 0 | 633,680 | 2.0% | 31 May, 2024 |
| 7 | Mark Lackner | Chief Scientific Officer | 512,856 | 0 | 512,856 | 1.6% | 05 Feb, 2025 |
| 8 | Kimberly Blackwell | Chief Executive Officer | 484,145 | 0 | 484,145 | 1.5% | 05 Feb, 2024 |
| 9 | Melissa B, Epperly | Chief Financial Officer | 451,449 | 0 | 451,449 | 1.4% | 12 Feb, 2024 |
| 10 | Scott Dunseth Myers | Director | 395,895 | 0 | 395,895 | 1.2% | 18 Jun, 2026 |
| 11 | Diana Hausman | Chief Medical Officer | 373,876 | 0 | 373,876 | 1.2% | 09 May, 2024 |
| 12 | David Michael Johnson | Director | 307,521 | 0 | 307,521 | 1.0% | 18 Jun, 2026 |
| 13 | Jan Skvarka | Director | 264,254 | 0 | 264,254 | 0.8% | 18 Jun, 2026 |
| 14 | Luke Nathaniel Walker | Director | 201,384 | 0 | 201,384 | 0.6% | 18 Jun, 2026 |
| 15 | Enoch Kariuki | Director | 194,465 | 0 | 194,465 | 0.6% | 18 Jun, 2026 |
| 16 | Vincent Vultaggio | Pao And Pfo | 146,506 | 0 | 146,506 | 0.5% | 10 Feb, 2026 |
| 17 | Shannon Campbell | Director | 114,200 | 0 | 114,200 | 0.4% | 27 May, 2026 |
| 18 | Carrie Brownstein | Chief Medical Officer | 105,685 | 0 | 105,685 | 0.3% | 06 Oct, 2023 |
| 19 | Julia Marie Eastland | Ceo President | 79,133 | 0 | 79,133 | 0.2% | 10 Feb, 2026 |
| 20 | Iris Roth | Chief Operating Officer | 52,500 | 0 | 52,500 | 0.2% | 02 Mar, 2023 |
| 21 | Ingmar Bruns | Chief Medical Officer | 33,332 | 0 | 33,332 | 0.1% | 10 Feb, 2026 |
| 22 | Alexis Pinto | Chief Legal Officer | 22,240 | 0 | 22,240 | 0.1% | 14 Feb, 2022 |
| 23 | Dimitris Voliotis | Svp, Clinical Development | 15,978 | 0 | 15,978 | 0.1% | 14 Feb, 2022 |
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 |
|---|---|---|---|---|---|---|---|---|
| 14 Aug, 2026 | Group Walters | TenPercentOwner | Acquired P | 4,335,000 | $3.50 | $15.17Mn | 17,844,973 | Direct |
| 16 Jun, 2026 | Scott Dunseth Myers | Director | Acquired A | 57,100 | $0.00 | $0 | 395,895 | Direct |
| 16 Jun, 2026 | Enoch Kariuki | Director | Acquired A | 57,100 | $0.00 | $0 | 194,465 | Direct |
| 16 Jun, 2026 | Luke Nathaniel Walker | Director | Acquired A | 57,100 | $0.00 | $0 | 201,384 | Direct |
| 16 Jun, 2026 | David Michael Johnson | Director | Acquired A | 57,100 | $0.00 | $0 | 307,521 | Direct |
| 16 Jun, 2026 | Jan Skvarka | Director | Acquired A | 57,100 | $0.00 | $0 | 264,254 | Direct |
| 26 May, 2026 | Shannon Campbell | Director | Acquired A | 114,200 | $0.00 | $0 | 114,200 | Direct |
| 06 Feb, 2026 | Ingmar Bruns | Chief Medical Officer | Disposed S | 2,962 | $2.43 | $7.20K | 33,667 | Direct |
| 06 Feb, 2026 | Julia Marie Eastland | Ceo President | Disposed S | 7,866 | $2.43 | $19.11K | 80,022 | Direct |
| 06 Feb, 2026 | Vincent Vultaggio | Pao And Pfo | Disposed S | 29,951 | $2.43 | $72.77K | 156,779 | Direct |
| 09 Feb, 2026 | Ingmar Bruns | Chief Medical Officer | Disposed S | 335 | $2.39 | $802 | 33,332 | Direct |
| 09 Feb, 2026 | Julia Marie Eastland | Ceo President | Disposed S | 889 | $2.39 | $2.13K | 79,133 | Direct |
| 09 Feb, 2026 | Vincent Vultaggio | Pao And Pfo | Disposed S | 3,379 | $2.39 | $8.09K | 153,400 | Direct |
| 10 Feb, 2026 | Vincent Vultaggio | Pao And Pfo | Disposed S | 6,894 | $2.42 | $16.70K | 146,506 | Direct |
| 02 Feb, 2026 | Vincent Vultaggio | Pao And Pfo | Disposed S | 2,540 | $2.55 | $6.48K | 187,286 | Direct |
| 03 Feb, 2026 | Vincent Vultaggio | Pao And Pfo | Disposed S | 556 | $2.52 | $1.40K | 186,730 | Direct |
| 08 Jan, 2026 | Vincent Vultaggio | Pao And Pfo | Acquired A | 100,000 | $0.00 | $0 | 100,000 | Direct |
| 08 Jan, 2026 | Ingmar Bruns | Chief Medical Officer | Acquired A | 365,000 | $0.00 | $0 | 365,000 | Direct |
| 08 Jan, 2026 | Julia Marie Eastland | Ceo President | Acquired A | 775,000 | $0.00 | $0 | 775,000 | Direct |
| 08 Jan, 2026 | James B Bucher | Chief Legal Officer | Acquired A | 100,000 | $0.00 | $0 | 100,000 | Direct |