According to recent filings covering the 90 days ending February 19, 2026, the three most significant insider holders at Sensei Biotherapeutics are Director James Peyer (414.56K shares), TenPercentOwner Biopharma Inc Cambrian (155.14K shares), Director Thomas G Ricks (17.54K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| James Peyer | 414,559 | 16 Feb, 2022 | |
| Thomas G Ricks | 17,535 | 12 Jul, 2023 | |
| Biopharma Inc Cambrian | 155,142 | 10 Dec, 2025 | |
| John Celebi | President And Ceo | 5,293 | 26 Feb, 2025 |
| Erin Colgan | Chief Financial Officer | 3,373 | 16 Feb, 2024 |
| Der Horst Edward Van | Chief Scientific Officer | 2,990 | 26 Feb, 2025 |
| Patrick Stephen Gallagher | Chief Business Officer | 2,176 | 29 Mar, 2023 |
| Bob Holmen | 1,280 | 12 Jul, 2023 | |
| William R Ringo | 1,170 | 12 Jul, 2023 | |
| Robert Hamilton Pierce | Chief R&D Officer | 1,050 | 17 Feb, 2022 |
| Jessie English | 447 | 12 Jul, 2023 | |
| Kristian Humer | 447 | 12 Jul, 2023 | |
| Samuel Broder | 447 | 12 Jul, 2023 | |
| Deneen Vojta | 447 | 12 Jul, 2023 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 09 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 395 | $8.04 | 155,588 | D | S |
| 09 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 446 | $7.92 | 155,142 | D | S |
| 09 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 2,666 | $7.95 | 155,588 | D | S |
| 09 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 3,105 | $8.59 | 158,254 | D | S |
| 09 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | A | 395 | $6.40 | 155,983 | D | M |
| 09 Dec, 2025 | James Peyer | Common Stock | D | 2,666 | $7.95 | 155,588 | I | S |
| 09 Dec, 2025 | James Peyer | Common Stock | A | 395 | $6.40 | 155,983 | I | M |
| 09 Dec, 2025 | James Peyer | Common Stock | D | 395 | $8.04 | 155,588 | I | S |
| 09 Dec, 2025 | James Peyer | Common Stock | D | 446 | $7.92 | 155,142 | I | S |
| 08 Dec, 2025 | James Peyer | Common Stock | D | 3,105 | $8.59 | 158,254 | I | S |
| 05 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 42 | $13.16 | 161,359 | D | S |
| 05 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 1,745 | $12.29 | 161,401 | D | S |
| 05 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 14,508 | $11.40 | 163,146 | D | S |
| 05 Dec, 2025 | James Peyer | Common Stock | D | 14,508 | $11.40 | 163,146 | I | S |
| 05 Dec, 2025 | James Peyer | Common Stock | D | 1,745 | $12.29 | 161,401 | I | S |
| 05 Dec, 2025 | James Peyer | Common Stock | D | 42 | $13.16 | 161,359 | I | S |
| 04 Dec, 2025 | Biopharma Inc Cambrian | Common Stock | D | 5,000 | $9.06 | 177,654 | D | S |
| 04 Dec, 2025 | James Peyer | Common Stock | D | 5,000 | $9.06 | 177,654 | I | S |
| 19 Feb, 2025 | John Celebi | Common Stock | D | 5,558 | $0.48 | 5,293 | D | F |
| 19 Feb, 2025 | John Celebi | - | - | 5,293 | D |