As of September 05, 2026, the three largest insider holders of TNXP are Seth Lederman (Chief Executive Officer, 11.01K shares), Seth Lederman (Chief Executive Officer, 9.01K shares), Richard Newcomb Stillwell (Director, 5.00K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Seth Lederman | Chief Executive Officer | 0 | 11,005 | 11,005 | 50.8% | 31 Aug, 2026 |
| 2 | Richard Newcomb Stillwell | Director | 5,000 | 0 | 5,000 | 23.1% | 09 Jun, 2026 |
| 3 | Carolyn E. Taylor | Director | 2,251 | 0 | 2,251 | 10.4% | 15 Jun, 2026 |
| 4 | Bradley Saenger | Chief Financial Officer | 2,154 | 0 | 2,154 | 9.9% | 09 Jul, 2026 |
| 5 | Richard H Bagger | Director | 1,000 | 0 | 1,000 | 4.6% | 24 Aug, 2026 |
| 6 | James Treco | Director | 250 | 0 | 250 | 1.2% | 20 Aug, 2025 |
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 |
|---|---|---|---|---|---|---|---|---|
| 27 Aug, 2026 | Seth Lederman | Chief Executive Officer | Acquired P | 2,000 | $13.79 | $27.58K | 11,005 | Indirect |
| 20 Aug, 2026 | Richard H Bagger | Director | Acquired P | 1,000 | $12.60 | $12.60K | 1,000 | Direct |
| 30 Jun, 2026 | Bradley Saenger | Chief Financial Officer | Acquired J | 1,453 | $10.91 | $15.86K | 2,154 | Direct |
| 12 Jun, 2026 | Carolyn E. Taylor | Director | Acquired P | 1,415 | $10.55 | $14.93K | 1,833 | Direct |
| 09 Jun, 2026 | Seth Lederman | Chief Executive Officer | Acquired P | 5,000 | $11.79 | $58.95K | 9,005 | Direct |
| 08 Jun, 2026 | Richard Newcomb Stillwell | Director | Acquired P | 5,000 | $11.65 | $58.25K | 5,000 | Direct |
| 12 May, 2026 | James Randolph Jr Hunter | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 12 May, 2026 | Adeoye Y Olukotun | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 12 May, 2026 | Margaret Smith Bell | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 12 May, 2026 | Richard Newcomb Stillwell | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 12 May, 2026 | James Treco | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 12 May, 2026 | Richard H Bagger | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 12 May, 2026 | Carolyn E. Taylor | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 12 May, 2026 | David L Grange | Director | Acquired A | 22,700 | $0.00 | $0 | 22,700 | Direct |
| 31 Mar, 2026 | Seth Lederman | Chief Executive Officer | Acquired P | 5,000 | $12.62 | $63.10K | 20,001 | Indirect |
| 18 Mar, 2026 | Seth Lederman | Chief Executive Officer | Acquired P | 15,000 | $14.89 | $223.35K | 15,001 | Indirect |
| 24 Feb, 2026 | Seth Lederman | Chief Executive Officer | Acquired A | 134,504 | $0.00 | $0 | 134,504 | Direct |
| 24 Feb, 2026 | Gregory M Sullivan | Chief Medical Officer | Acquired A | 39,012 | $0.00 | $0 | 39,012 | Direct |
| 24 Feb, 2026 | Siobhan Fogarty | Chief Technology Officer | Acquired A | 39,012 | $0.00 | $0 | 39,012 | Direct |
| 24 Feb, 2026 | Jessica Edgar Morris | Chief Operating Officer | Acquired A | 39,012 | $0.00 | $0 | 39,012 | Direct |