According to recent filings covering the 90 days ending February 19, 2026, the three most significant insider holders at Tandem Diabetes Care are Director Kim D Blickenstaff (183.04K shares), President & Ceo John F Sheridan (117.60K shares), Evp & Chief Financial Officer Leigh Vosseller (63.23K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Kim D Blickenstaff | 183,038 | 24 May, 2024 | |
| John F Sheridan | President & Ceo | 117,600 | 19 Nov, 2025 |
| Leigh Vosseller | Evp & Chief Financial Officer | 63,228 | 19 Nov, 2025 |
| Susan Morrison | Evp & Chief Admin. Officer | 40,917 | 19 Nov, 2025 |
| Mark David Novara | Evp & Chief Commercial Officer | 35,956 | 17 Dec, 2025 |
| Elizabeth Anne Gasser | Evp And Chief Strategy Officer | 25,949 | 08 Dec, 2025 |
| Rick Carpenter | Chief Technology Officer | 24,252 | 17 Dec, 2025 |
| Jean-Claude Kyrillos | Evp & Chief Operating Officer | 24,062 | 20 Jan, 2026 |
| Shannon Marie Hansen | Evp & Chief Legal Officer | 23,409 | 19 Nov, 2025 |
| Christopher J Twomey | 23,243 | 23 May, 2025 | |
| Peyton R Howell | 21,077 | 23 May, 2025 | |
| Dick Allen | 19,387 | 23 May, 2025 | |
| Kathleen Mcgroddy-Goetz | 17,853 | 23 May, 2025 | |
| James Leal | Chief Manufacturing Officer | 16,876 | 28 May, 2024 |
| Rajwant Sodhi | 15,521 | 23 May, 2025 | |
| Rebecca B Robertson | 13,783 | 23 May, 2025 | |
| Myoungil Cha | 13,699 | 18 Jun, 2025 | |
| Joao Paulo Falcao Malagueira | 13,699 | 18 Jun, 2025 | |
| Brian B Hansen | Evp & Chief Commercial Officer | 12,622 | 29 Nov, 2023 |
| David B Berger | Evp & Chief Operating Officer | 6,580 | 29 Nov, 2023 |
| Douglas A Roeder | 5,971 | 19 May, 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Jan, 2026 | Jean-Claude Kyrillos | Common Stock | D | 2,118 | $21.07 | 24,062 | D | F |
| 15 Jan, 2026 | Jean-Claude Kyrillos | Common Stock | A | 3,636 | $0.00 | 26,180 | D | M |
| 15 Dec, 2025 | Rick Carpenter | - | - | 24,252 | D | |||
| 15 Dec, 2025 | Rick Carpenter | Common Stock | D | 207 | $22.11 | 24,252 | D | F |
| 15 Dec, 2025 | Rick Carpenter | - | - | 24,459 | D | |||
| 15 Dec, 2025 | Rick Carpenter | Common Stock | A | 406 | $0.00 | 24,459 | D | M |
| 15 Dec, 2025 | Mark David Novara | Common Stock | A | 7,415 | $0.00 | 39,799 | D | M |
| 15 Dec, 2025 | Mark David Novara | Common Stock | D | 3,843 | $22.11 | 35,956 | D | F |
| 04 Dec, 2025 | Elizabeth Anne Gasser | Common Stock | A | 3,000 | $0.00 | 25,949 | I | J |
| 04 Dec, 2025 | Elizabeth Anne Gasser | Common Stock | D | 3,000 | $0.00 | 0 | D | J |
| 04 Dec, 2025 | Elizabeth Anne Gasser | - | - | 25,949 | I | |||
| 17 Nov, 2025 | John F Sheridan | Common Stock | A | 5,472 | $0.00 | 117,435 | D | M |
| 17 Nov, 2025 | John F Sheridan | Common Stock | D | 3,038 | $18.61 | 117,600 | D | F |
| 17 Nov, 2025 | John F Sheridan | Common Stock | A | 5,982 | $0.00 | 120,638 | D | M |
| 17 Nov, 2025 | John F Sheridan | Common Stock | D | 2,779 | $18.61 | 114,656 | D | F |
| 17 Nov, 2025 | Rick Carpenter | Common Stock | A | 1,437 | $0.00 | 24,342 | D | M |
| 17 Nov, 2025 | Rick Carpenter | Common Stock | A | 897 | $0.00 | 24,509 | D | M |
| 17 Nov, 2025 | Rick Carpenter | Common Stock | A | 339 | $15.59 | 22,905 | D | A |
| 17 Nov, 2025 | Rick Carpenter | Common Stock | D | 730 | $18.61 | 23,612 | D | F |
| 17 Nov, 2025 | Rick Carpenter | Common Stock | D | 456 | $18.61 | 24,053 | D | F |