TNXP's three largest insider shareholders as of September 29, 2026 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 |
| 08 Jun, 2026 | Richard Newcomb Stillwell | Director | Acquired P | 5,000 | $11.65 | $58.25K | 5,000 | Direct |
| 09 Jun, 2026 | Seth Lederman | Chief Executive Officer | Acquired P | 5,000 | $11.79 | $58.95K | 9,005 | Direct |
| 12 May, 2026 | James Treco | 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 | Richard H Bagger | 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 | Adeoye Y Olukotun | 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 |
| 12 May, 2026 | James Randolph Jr Hunter | 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 | Jessica Edgar Morris | Chief Operating Officer | Acquired A | 39,012 | $0.00 | $0 | 39,012 | Direct |
| 24 Feb, 2026 | Bradley Saenger | Chief Financial Officer | Acquired A | 39,012 | $0.00 | $0 | 39,012 | Direct |