TNDM · Insider Trading
Tandem Diabetes Care, Inc.
Every open-market purchase and sale reported by TNDM officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Form 4 Filings
50
most recent
Open-Market Buys
0
code P
Sales
1
code S
Reporting Insiders
17
current holders
TNDM — Recent Form 4 Transactions (latest 2026-10-19)
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-19 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | MIXED | +1,711 | −$31.82K |
| 2026-08-18 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | MIXED | +475 | −$12.16K |
| 2026-08-18 | Rick Carpenter | EVP & Chief Technology Officer | MIXED | +1,230 | −$29.01K |
| 2026-08-18 | Elizabeth Anne Gasser | EVP, Chief Strategy Officer | MIXED | +1,396 | −$36.76K |
| 2026-08-18 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | MIXED | +2,641 | −$33.60K |
| 2026-08-18 | John F Sheridan | PRESIDENT & CEO | MIXED | +7,817 | −$184.01K |
| 2026-08-18 | Shannon Marie Hansen | EVP & Chief Legal Officer | MIXED | +1,479 | −$34.88K |
| 2026-08-18 | Susan Morrison | EVP & Chief Admin. Officer | MIXED | +2,018 | −$18.38K |
| 2026-07-17 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | MIXED | +1,710 | −$29.43K |
| 2026-06-04 | Elizabeth Anne Gasser | EVP, Chief Strategy Officer | G | — | — |
| 2026-06-02 | John F Sheridan | PRESIDENT & CEO | A | +191,103 deriv. | — |
| 2026-06-02 | Rick Carpenter | EVP & Chief Technology Officer | A | +26,003 deriv. | — |
| 2026-06-02 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | A | +29,136 deriv. | — |
| 2026-06-02 | Susan Morrison | EVP & Chief Admin. Officer | A | +29,136 deriv. | — |
| 2026-06-02 | Elizabeth Anne Gasser | EVP, Chief Strategy Officer | A | +29,136 deriv. | — |
| 2026-06-02 | Shannon Marie Hansen | EVP & Chief Legal Officer | A | +29,136 deriv. | — |
| 2026-06-02 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | A | +62,657 deriv. | — |
| 2026-05-22 | Rebecca B Robertson | Director | M | +8,759 | — |
| 2026-05-22 | Sandra Beaver | Director | A | +5,110 deriv. | — |
| 2026-05-22 | Joao Paulo Falcao Malagueira | Director | M | +8,759 | — |
| 2026-05-22 | Myoungil Cha | Director | M | +8,759 | — |
| 2026-05-22 | Christopher J Twomey | Director | M | +8,759 | — |
| 2026-05-22 | Peyton R Howell | Director | M | +8,759 | — |
| 2026-05-22 | Kathleen McGroddy-Goetz | Director | M | +8,759 | — |
| 2026-05-22 | Dick Allen | — | M | +8,759 | — |
| 2026-05-22 | Rajwant Sodhi | Director | M | +8,759 | — |
| 2026-05-19 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | MIXED | +2,333 | −$22.69K |
| 2026-05-19 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | MIXED | +2,661 | −$101.42K |
| 2026-05-19 | Elizabeth Anne Gasser | EVP, Chief Strategy Officer | MIXED | +6,094 | −$56.06K |
| 2026-05-19 | Shannon Marie Hansen | EVP & Chief Legal Officer | MIXED | +6,895 | −$46.00K |
| 2026-05-19 | Susan Morrison | EVP & Chief Admin. Officer | MIXED | +8,135 | −$20.36K |
| 2026-05-19 | Rick Carpenter | EVP & Chief Technology Officer | MIXED | +5,644 | −$42.69K |
| 2026-05-19 | John F Sheridan | PRESIDENT & CEO | MIXED | +27,752 | −$303.03K |
| 2026-05-19 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | MIXED | +9,988 | −$47.52K |
| 2026-04-17 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | MIXED | +1,710 | −$39.79K |
| 2026-03-18 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | MIXED | +1,687 | −$123.92K |
| 2026-03-09 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | Sell | −2 | −$46 |
| 2026-02-19 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | MIXED | +15 | −$1.17K |
| 2026-02-19 | Rick Carpenter | Chief Technology Officer | MIXED | +1,022 | −$24.86K |
| 2026-02-19 | Elizabeth Anne Gasser | EVP, Chief Strategy Officer | MIXED | +1,066 | −$29.07K |
| 2026-02-19 | Susan Morrison | EVP & Chief Admin. Officer | MIXED | +1,718 | −$16.71K |
| 2026-02-19 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | MIXED | +1,763 | −$23.40K |
| 2026-02-19 | John F Sheridan | PRESIDENT & CEO | MIXED | +7,091 | −$82.68K |
| 2026-02-19 | Shannon Marie Hansen | EVP & Chief Legal Officer | MIXED | +1,802 | −$23.93K |
| 2026-01-20 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | MIXED | +1,518 | −$44.63K |
| 2025-12-17 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | MIXED | +3,572 | −$84.97K |
| 2025-12-17 | Rick Carpenter | Chief Technology Officer | MIXED | +199 | −$4.58K |
| 2025-12-08 | Elizabeth Anne Gasser | EVP, Chief Strategy Officer | J | — | — |
| 2025-11-25 | Sandra Beaver | Director | A | +20,242 deriv. | — |
| 2025-11-19 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | A | +160 | +$2.49K |
TNDM — Current Insider Holders
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Kim D Blickenstaff | Director | 213,038 | $3.52M |
| John F Sheridan | PRESIDENT & CEO | 160,260 | $2.65M |
| Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | 78,562 | $1.30M |
| Susan Morrison | EVP & Chief Admin. Officer | 52,788 | $873.11K |
| Dick Allen | Director | 50,903 | $841.94K |
| Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | 40,317 | $666.84K |
| Elizabeth Anne Gasser | EVP, Chief Strategy Officer | 34,206 | $565.77K |
| Shannon Marie Hansen | EVP & Chief Legal Officer | 32,644 | $539.93K |
| Rick Carpenter | EVP & Chief Technology Officer | 32,148 | $531.73K |
| Jean-Claude Kyrillos | EVP & Chief Operating Officer | 32,001 | $529.30K |
| Peyton R Howell | Director | 29,836 | $493.49K |
| Christopher J Twomey | Director | 29,546 | $488.69K |
| Kathleen McGroddy-Goetz | Director | 26,612 | $440.16K |
| Rajwant Sodhi | Director | 24,280 | $401.59K |
| Rebecca B Robertson | Director | 22,542 | $372.84K |
| Myoungil Cha | Director | 22,458 | $371.46K |
| Joao Paulo Falcao Malagueira | Director | 22,458 | $371.46K |
TNDM Insider Trading FAQ
Who are the insiders at TNDM?
17 officers, directors and 10%+ beneficial owners currently report holdings in TNDM via SEC Form 4.
Are TNDM insiders buying or selling?
Across the 50 most recent Form 4 filings for TNDM, 0 were open-market purchases (code P) and 1 were sales (code S). Sales frequently reflect scheduled 10b5-1 plans or tax withholding rather than a view on the stock.
How current is TNDM insider data?
Form 4 must be filed within two business days of the transaction, so this is close to real time. The most recent TNDM filing is dated 2026-10-19.
How to read Form 4 activity
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the TNDM quote page; the site-wide leaderboard is on the insider transactions hub.
More on TNDM
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.