Tandem Diabetes Care's three largest insider shareholders as of September 29, 2026 are Kim D Blickenstaff (Executive Chairman, 165.19K shares), John F Sheridan (President Ceo, 160.26K shares), Susan Morrison (Evp Chief Admin. Officer, 52.79K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Kim D Blickenstaff | Executive Chairman | 0 | 165,190 | 165,190 | 20.5% | 22 Nov, 2024 |
| 2 | John F Sheridan | President Ceo | 160,260 | 0 | 160,260 | 19.9% | 18 Aug, 2026 |
| 3 | Susan Morrison | Evp Chief Admin. Officer | 52,788 | 0 | 52,788 | 6.6% | 18 Aug, 2026 |
| 4 | Leigh Vosseller | Evp Chief Financial Officer | 52,040 | 0 | 52,040 | 6.5% | 18 Aug, 2026 |
| 5 | Mark David Novara | Evp Chief Commercial Officer | 40,317 | 0 | 40,317 | 5.0% | 19 May, 2026 |
| 6 | Rick Carpenter | Evp Chief Technology Officer | 32,148 | 0 | 32,148 | 4.0% | 18 Aug, 2026 |
| 7 | Shannon Marie Hansen | Evp Chief Legal Officer | 31,650 | 0 | 31,650 | 3.9% | 18 Aug, 2026 |
| 8 | Jean-Claude Kyrillos | Evp Chief Operating Officer | 30,290 | 0 | 30,290 | 3.8% | 18 Aug, 2026 |
| 9 | Peyton R Howell | Director | 29,836 | 0 | 29,836 | 3.7% | 22 May, 2026 |
| 10 | Dick Allen | Other | 28,146 | 0 | 28,146 | 3.5% | 22 May, 2026 |
| 11 | Kathleen Mcgroddy-Goetz | Director | 26,612 | 0 | 26,612 | 3.3% | 22 May, 2026 |
| 12 | Christopher J Twomey | Director | 24,434 | 0 | 24,434 | 3.0% | 22 May, 2026 |
| 13 | Rajwant Sodhi | Director | 24,280 | 0 | 24,280 | 3.0% | 22 May, 2026 |
| 14 | Rebecca B Robertson | Director | 22,542 | 0 | 22,542 | 2.8% | 22 May, 2026 |
| 15 | Myoungil Cha | Director | 22,458 | 0 | 22,458 | 2.8% | 22 May, 2026 |
| 16 | Joao Paulo Falcao Malagueira | Director | 22,458 | 0 | 22,458 | 2.8% | 22 May, 2026 |
| 17 | James Leal | Chief Manufacturing Officer | 16,876 | 0 | 16,876 | 2.1% | 28 May, 2024 |
| 18 | Brian B Hansen | Evp Chief Commercial Officer | 12,622 | 0 | 12,622 | 1.6% | 29 Nov, 2023 |
| 19 | David B Berger | Evp Chief Operating Officer | 6,338 | 0 | 6,338 | 0.8% | 29 Nov, 2023 |
| 20 | Douglas A Roeder | Director | 2,205 | 0 | 2,205 | 0.3% | 19 May, 2022 |
| 21 | Elizabeth Anne Gasser | Evp, Chief Strategy Officer | 1,396 | 0 | 1,396 | 0.2% | 18 Aug, 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Aug, 2026 | Rick Carpenter | Evp Chief Technology Officer | Acquired M | 897 | $0.00 | $0 | 31,815 | Direct |
| 15 Aug, 2026 | Shannon Marie Hansen | Evp Chief Legal Officer | Acquired M | 1,097 | $0.00 | $0 | 31,268 | Direct |
| 15 Aug, 2026 | Elizabeth Anne Gasser | Evp, Chief Strategy Officer | Acquired M | 1,097 | $0.00 | $0 | 1,097 | Direct |
| 15 Aug, 2026 | Leigh Vosseller | Evp Chief Financial Officer | Acquired M | 1,496 | $0.00 | $0 | 50,895 | Direct |
| 15 Aug, 2026 | John F Sheridan | President Ceo | Acquired M | 5,982 | $0.00 | $0 | 158,425 | Direct |
| 15 Aug, 2026 | Susan Morrison | Evp Chief Admin. Officer | Acquired M | 1,097 | $0.00 | $0 | 51,867 | Direct |
| 15 Aug, 2026 | Jean-Claude Kyrillos | Evp Chief Operating Officer | Acquired M | 1,010 | $0.00 | $0 | 30,825 | Direct |
| 15 Aug, 2026 | Rick Carpenter | Evp Chief Technology Officer | Disposed F | 457 | $22.72 | $10.38K | 31,358 | Direct |
| 15 Aug, 2026 | Shannon Marie Hansen | Evp Chief Legal Officer | Disposed F | 559 | $22.72 | $12.70K | 30,709 | Direct |
| 15 Aug, 2026 | Elizabeth Anne Gasser | Evp, Chief Strategy Officer | Disposed F | 589 | $22.72 | $13.38K | 508 | Direct |
| 15 Aug, 2026 | John F Sheridan | President Ceo | Disposed F | 3,044 | $22.72 | $69.16K | 155,381 | Direct |
| 15 Aug, 2026 | Susan Morrison | Evp Chief Admin. Officer | Disposed F | 314 | $22.72 | $7.13K | 51,553 | Direct |
| 15 Aug, 2026 | Jean-Claude Kyrillos | Evp Chief Operating Officer | Disposed F | 535 | $22.72 | $12.16K | 30,290 | Direct |
| 15 Aug, 2026 | Leigh Vosseller | Evp Chief Financial Officer | Disposed F | 537 | $22.72 | $12.20K | 50,358 | Direct |
| 15 Aug, 2026 | Shannon Marie Hansen | Evp Chief Legal Officer | Acquired M | 1,917 | $0.00 | $0 | 32,626 | Direct |
| 15 Aug, 2026 | Jean-Claude Kyrillos | Evp Chief Operating Officer | Disposed M | 1,010 | $0.00 | $0 | 7,067 | Direct |
| 15 Aug, 2026 | Rick Carpenter | Evp Chief Technology Officer | Acquired M | 1,610 | $0.00 | $0 | 32,968 | Direct |
| 15 Aug, 2026 | John F Sheridan | President Ceo | Acquired M | 9,934 | $0.00 | $0 | 165,315 | Direct |
| 15 Aug, 2026 | Susan Morrison | Evp Chief Admin. Officer | Acquired M | 1,730 | $0.00 | $0 | 53,283 | Direct |
| 15 Aug, 2026 | Leigh Vosseller | Evp Chief Financial Officer | Acquired M | 2,624 | $0.00 | $0 | 52,982 | Direct |