As of March 23, 2026, the three largest insider holders of STTK are Group, Llc Redmile (Director, 5.54Mn shares), Josiah Hornblower (Director, 2.97Mn shares), Taylor Schreiber (Chief Executive Officer, 2.61Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Group, Llc Redmile | 0 | 5,539,724 | 06 Dec, 2024 | |
| Josiah Hornblower | 0 | 2,966,709 | 16 Jul, 2021 | |
| Taylor Schreiber | Chief Executive Officer | 0 | 2,610,750 | 25 May, 2021 |
| Mona Ashiya | 0 | 1,051,021 | 02 Sep, 2025 | |
| Tyler Brous | 238,088 | 0 | 01 Jul, 2024 | |
| Andrew R Neill | Chief Financial Officer | 228,224 | 0 | 27 Jan, 2026 |
| Arundathy N. Pandite | Chief Medical Officer | 196,219 | 0 | 27 Jan, 2026 |
| Josiah Hornblower | 188,375 | 0 | 25 Jun, 2021 | |
| Erin Ator Thomson | General Counsel | 103,209 | 0 | 27 Jan, 2023 |
| Taylor Schreiber | Chief Executive Officer | 96,612 | 0 | 27 Aug, 2025 |
| Stephen Stout | See Remarks | 81,529 | 0 | 27 Jan, 2026 |
| Abhinav A. Shukla | Chief Technical Officer | 81,258 | 0 | 27 Aug, 2025 |
| Casi Deyoung | Chief Business Officer | 73,480 | 0 | 27 Jan, 2026 |
| George Golumbeski | 54,613 | 0 | 27 Apr, 2022 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 25 Jan, 2026 | Casi Deyoung | Common Stock | D | 2,286 | $4.15 | 73,480 | D | F |
| 25 Jan, 2026 | Arundathy N. Pandite | Common Stock | D | 3,195 | $4.15 | 196,219 | D | F |
| 25 Jan, 2026 | Stephen Stout | Common Stock | D | 593 | $4.15 | 81,529 | D | F |
| 25 Jan, 2026 | Andrew R Neill | Common Stock | D | 2,589 | $4.15 | 228,224 | D | F |
| 10 Jan, 2026 | Taylor Schreiber | Stock Option (Right to Buy) | A | 1,548,300 | $0.00 | 1,548,300 | D | A |
| 10 Jan, 2026 | Abhinav A. Shukla | Common Stock | A | 315,500 | $0.00 | 315,500 | D | A |
| 10 Jan, 2026 | Casi Deyoung | Common Stock | D | 5,699 | $4.75 | 75,766 | D | F |
| 10 Jan, 2026 | Arundathy N. Pandite | Common Stock | D | 6,851 | $4.75 | 199,414 | D | F |
| 10 Jan, 2026 | Andrew R Neill | Common Stock | D | 6,660 | $4.75 | 230,813 | D | F |
| 10 Jan, 2026 | Stephen Stout | Common Stock | D | 4,153 | $4.75 | 82,122 | D | F |
| 10 Jan, 2026 | Casi Deyoung | Common Stock | A | 381,600 | $0.00 | 381,600 | D | A |
| 10 Jan, 2026 | Andrew R Neill | Stock Option (Right to Buy) | A | 549,800 | $0.00 | 549,800 | D | A |
| 10 Jan, 2026 | Stephen Stout | Stock Option (Right to Buy) | A | 351,400 | $0.00 | 351,400 | D | A |
| 10 Jan, 2026 | Arundathy N. Pandite | Common Stock | A | 487,800 | $0.00 | 487,800 | D | A |
| 28 Aug, 2025 | Mona Ashiya | Stock Option (Right to Buy) | A | 66,300 | $0.00 | 66,300 | D | A |
| 25 Aug, 2025 | Mona Ashiya | Common Stock | A | 5,255,106 | $0.87 | 5,255,106 | I | P |
| 28 Aug, 2025 | Daniel G. Baker | Stock Option (Right to Buy) | A | 66,300 | $0.00 | 66,300 | D | A |
| 25 Aug, 2025 | Mona Ashiya | Common Stock | A | 1,051,021 | $0.87 | 1,051,021 | I | P |
| 25 Aug, 2025 | Mona Ashiya | Pre-Funded Warrants (right to buy) | A | 10,111,384 | - | 10,111,384 | I | P |
| 25 Aug, 2025 | Mona Ashiya | Pre-Funded Warrants (right to buy) | A | 2,022,277 | - | 2,022,277 | I | P |