TNDM (Tandem Diabetes Care, Inc.)

Insider Trading Activity

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.

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.

Form 4 Filings
50
most recent
Open-Market Buys
0
code P
Sales
1
code S
Reporting Insiders
15
current holders
TNDM — Recent Form 4 Transactions (latest 2026-08-18)
FiledInsiderRole TypeSharesValue
2026-08-18 Jean-Claude Kyrillos EVP & Chief Operating Officer MIXED
2026-08-18 Rick Carpenter EVP & Chief Technology Officer MIXED
2026-08-18 Elizabeth Anne Gasser EVP, Chief Strategy Officer MIXED
2026-08-18 Leigh Vosseller EVP & CHIEF FINANCIAL OFFICER MIXED
2026-08-18 John F Sheridan PRESIDENT & CEO MIXED
2026-08-18 Shannon Marie Hansen EVP & Chief Legal Officer MIXED
2026-08-18 Susan Morrison EVP & Chief Admin. Officer MIXED
2026-07-17 Jean-Claude Kyrillos EVP & Chief Operating Officer MIXED
2026-06-04 Elizabeth Anne Gasser EVP, Chief Strategy Officer G
2026-06-02 John F Sheridan PRESIDENT & CEO A
2026-06-02 Rick Carpenter EVP & Chief Technology Officer A
2026-06-02 Jean-Claude Kyrillos EVP & Chief Operating Officer A
2026-06-02 Susan Morrison EVP & Chief Admin. Officer A
2026-06-02 Elizabeth Anne Gasser EVP, Chief Strategy Officer A
2026-06-02 Shannon Marie Hansen EVP & Chief Legal Officer A
2026-06-02 Leigh Vosseller EVP & CHIEF FINANCIAL OFFICER A
2026-05-22 REBECCA B ROBERTSON Director M
2026-05-22 Sandra Beaver Director A
2026-05-22 Joao Paulo Falcao Malagueira Director M
2026-05-22 Myoungil Cha Director M
2026-05-22 CHRISTOPHER J TWOMEY Director M
2026-05-22 Peyton R Howell Director M
2026-05-22 Kathleen McGroddy-Goetz Director M
2026-05-22 Dick Allen M
2026-05-22 Rajwant Sodhi Director M
2026-05-19 Jean-Claude Kyrillos EVP & Chief Operating Officer MIXED
2026-05-19 Mark David Novara EVP & CHIEF COMMERCIAL OFFICER MIXED
2026-05-19 Elizabeth Anne Gasser EVP, Chief Strategy Officer MIXED
2026-05-19 Shannon Marie Hansen EVP & Chief Legal Officer MIXED
2026-05-19 Susan Morrison EVP & Chief Admin. Officer MIXED
2026-05-19 Rick Carpenter EVP & Chief Technology Officer MIXED
2026-05-19 John F Sheridan PRESIDENT & CEO MIXED
2026-05-19 Leigh Vosseller EVP & CHIEF FINANCIAL OFFICER MIXED
2026-04-17 Jean-Claude Kyrillos EVP & Chief Operating Officer MIXED
2026-03-18 Mark David Novara EVP & CHIEF COMMERCIAL OFFICER MIXED
2026-03-09 Mark David Novara EVP & CHIEF COMMERCIAL OFFICER Sell
2026-02-19 Mark David Novara EVP & CHIEF COMMERCIAL OFFICER MIXED
2026-02-19 Rick Carpenter Chief Technology Officer MIXED
2026-02-19 Elizabeth Anne Gasser EVP, Chief Strategy Officer MIXED
2026-02-19 Susan Morrison EVP & Chief Admin. Officer MIXED
2026-02-19 Leigh Vosseller EVP & CHIEF FINANCIAL OFFICER MIXED
2026-02-19 John F Sheridan PRESIDENT & CEO MIXED
2026-02-19 Shannon Marie Hansen EVP & Chief Legal Officer MIXED
2026-01-20 Jean-Claude Kyrillos EVP & Chief Operating Officer MIXED
2025-12-17 Mark David Novara EVP & CHIEF COMMERCIAL OFFICER MIXED
2025-12-17 Rick Carpenter Chief Technology Officer MIXED
2025-12-08 Elizabeth Anne Gasser EVP, Chief Strategy Officer J
2025-11-25 Sandra Beaver Director A
2025-11-19 Jean-Claude Kyrillos EVP & Chief Operating Officer A
2025-11-19 Mark David Novara EVP & CHIEF COMMERCIAL OFFICER MIXED
TNDM — Current Insider Holders
InsiderRole Shares HeldValue
10%+ Owner 318,906
10%+ Owner 318,906
10%+ Owner 318,906
10%+ Owner 318,906
10%+ Owner 318,906
Director 318,906
10%+ Owner 318,906
10%+ Owner 249,619
Director 213,038
PRESIDENT & CEO 160,260
10%+ Owner 145,406
EVP & CHIEF FINANCIAL OFFICER 78,562
EVP & Chief Admin. Officer 52,788
Director 50,903
EVP & CHIEF COMMERCIAL OFFICER 40,317
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.