As of September 29, 2026, the three largest insider holders of STOK are Trust Skorpios (TenPercentOwner, 3.91Mn shares), Adrian R. Krainer (Director, 283.30K shares), Edward M. Md Kaye (Ceo, 124.56K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Trust Skorpios | TenPercentOwner | 0 | 3,906,181 | 3,906,181 | 88.1% | 06 Jun, 2025 |
| 2 | Adrian R. Krainer | Director | 283,302 | 0 | 283,302 | 6.4% | 12 Mar, 2026 |
| 3 | Edward M. Md Kaye | Ceo | 124,557 | 0 | 124,557 | 2.8% | 18 Aug, 2026 |
| 4 | Arthur Tzianabos | Interim Executive Chair | 31,339 | 0 | 31,339 | 0.7% | 12 Mar, 2026 |
| 5 | Jonathan Allan | General Counsel Corp Sec | 21,225 | 0 | 21,225 | 0.5% | 18 Aug, 2026 |
| 6 | Stephen J Tulipano | Cfo | 20,746 | 0 | 20,746 | 0.5% | 19 Mar, 2024 |
| 7 | Barry Ticho | Chief Medical Officer | 20,110 | 0 | 20,110 | 0.5% | 03 Sep, 2026 |
| 8 | Jason Hoitt | Chief Patient Officer | 10,276 | 0 | 10,276 | 0.2% | 19 Mar, 2026 |
| 9 | Thomas Leggett | Chief Financial Officer | 10,172 | 0 | 10,172 | 0.2% | 19 Mar, 2026 |
| 10 | Arthur A Levin | Director | 4,237 | 0 | 4,237 | 0.1% | 17 Mar, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 23 Sep, 2026 | Alexander Cumbo | Director | Acquired A | 39,674 | $0.00 | $0 | 39,674 | Direct |
| 01 Sep, 2026 | Barry Ticho | Chief Medical Officer | Disposed S | 3,945 | $30.51 | $120.37K | 21,710 | Direct |
| 01 Sep, 2026 | Barry Ticho | Chief Medical Officer | Disposed S | 1,600 | $31.06 | $49.69K | 20,110 | Direct |
| 14 Aug, 2026 | Edward M. Md Kaye | Director | Acquired M | 26,250 | $0.00 | $0 | 137,124 | Direct |
| 14 Aug, 2026 | Barry Ticho | Chief Medical Officer | Acquired M | 10,000 | $0.00 | $0 | 30,422 | Direct |
| 14 Aug, 2026 | Jonathan Allan | General Counsel Corp Sec | Acquired M | 6,000 | $0.00 | $0 | 24,086 | Direct |
| 18 Aug, 2026 | Jonathan Allan | General Counsel Corp Sec | Disposed S | 2,716 | $32.01 | $86.93K | 21,370 | Direct |
| 18 Aug, 2026 | Edward M. Md Kaye | Director | Disposed S | 11,930 | $32.01 | $381.85K | 125,194 | Direct |
| 18 Aug, 2026 | Barry Ticho | Chief Medical Officer | Disposed S | 4,525 | $32.01 | $144.83K | 25,897 | Direct |
| 18 Aug, 2026 | Jonathan Allan | General Counsel Corp Sec | Disposed S | 145 | $32.47 | $4.71K | 21,225 | Direct |
| 18 Aug, 2026 | Barry Ticho | Chief Medical Officer | Disposed S | 242 | $32.47 | $7.86K | 25,655 | Direct |
| 18 Aug, 2026 | Edward M. Md Kaye | Director | Disposed S | 637 | $32.47 | $20.68K | 124,557 | Direct |
| 14 Aug, 2026 | Edward M. Md Kaye | Director | Disposed M | 26,250 | $0.00 | $0 | 0 | Direct |
| 14 Aug, 2026 | Jonathan Allan | General Counsel Corp Sec | Disposed M | 6,000 | $0.00 | $0 | 0 | Direct |
| 14 Aug, 2026 | Barry Ticho | Chief Medical Officer | Disposed M | 10,000 | $0.00 | $0 | 0 | Direct |
| 03 Aug, 2026 | Barry Ticho | Chief Medical Officer | Disposed S | 5,907 | $28.95 | $171.01K | 21,691 | Direct |
| 03 Aug, 2026 | Barry Ticho | Chief Medical Officer | Disposed S | 1,269 | $29.45 | $37.38K | 20,422 | Direct |
| 15 Jul, 2026 | Thomas Mccauley | Chief Scientific Officer | Acquired A | 225,000 | $0.00 | $0 | 225,000 | Direct |
| 16 Jul, 2026 | Seth Loring Harrison | Director | Disposed G | 29,555 | $0.00 | $0 | 0 | Direct |
| 16 Jul, 2026 | Seth Loring Harrison | Director | Acquired G | 29,555 | $0.00 | $0 | 29,555 | Indirect |