Tandem Diabetes Care Inc (TNDM) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, Tandem Diabetes Care's top three insider holders are John F Sheridan (President Ceo, 124.69K shares), Susan Morrison (Evp Chief Admin. Officer, 42.63K shares), Leigh Vosseller (Evp Chief Financial Officer, 39.41K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
John F Sheridan President Ceo 124,691 0 19 Feb, 2026
Susan Morrison Evp Chief Admin. Officer 42,635 0 19 Feb, 2026
Leigh Vosseller Evp Chief Financial Officer 39,411 0 19 Feb, 2026
Mark David Novara Evp Chief Commercial Officer 37,656 0 18 Mar, 2026
Mark David Novara Evp Chief Commercial Officer 35,969 0 09 Mar, 2026
Elizabeth Anne Gasser Evp, Chief Strategy Officer 0 25,949 08 Dec, 2025
Leigh Vosseller Evp Chief Financial Officer 0 25,580 11 Aug, 2025
Rick Carpenter Chief Technology Officer 25,274 0 19 Feb, 2026
Jean-Claude Kyrillos Evp Chief Operating Officer 24,062 0 20 Jan, 2026
Shannon Marie Hansen Evp Chief Legal Officer 23,276 0 19 Feb, 2026
Peyton R Howell 21,077 0 23 May, 2025
Dick Allen 19,387 0 23 May, 2025
Kathleen Mcgroddy-Goetz 17,853 0 23 May, 2025
James Leal Chief Manufacturing Officer 16,876 0 28 May, 2024
Christopher J Twomey 15,675 0 23 May, 2025
Rajwant Sodhi 15,521 0 23 May, 2025
Myoungil Cha 13,699 0 18 Jun, 2025
Joao Paulo Falcao Malagueira 13,699 0 18 Jun, 2025
Brian B Hansen Evp Chief Commercial Officer 12,622 0 29 Nov, 2023
Christopher J Twomey 0 7,568 10 May, 2022
David B Berger Evp Chief Operating Officer 6,338 0 29 Nov, 2023
Douglas A Roeder 0 3,766 20 Oct, 2021
Douglas A Roeder 0 3,766 20 Oct, 2021
Douglas A Roeder 2,205 0 19 May, 2022
Douglas A Roeder 2,205 0 19 May, 2022
Shannon Marie Hansen Chief Legal Officer 0 1,935 13 Nov, 2023
Elizabeth Anne Gasser Evp, Chief Strategy Officer 1,066 0 19 Feb, 2026
David B Berger Evp, Chief Business/Compliance 0 242 20 May, 2021

* 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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
16 Mar, 2026 Mark David Novara Common Stock A 7,414 $0.00 43,383 D M
16 Mar, 2026 Mark David Novara Common Stock D 5,540 $21.59 37,843 D F
17 Mar, 2026 Mark David Novara Common Stock D 187 $23.05 37,656 D S
16 Mar, 2026 Mark David Novara Restricted Stock Unit D 7,414 $0.00 22,244 D M
05 Mar, 2026 Mark David Novara Common Stock D 2 $22.81 35,969 D S
05 Mar, 2026 Mark David Novara Common Stock D 2 $22.81 35,969 D S
17 Feb, 2026 Elizabeth Anne Gasser Common Stock A 1,503 $0.00 1,503 D M
17 Feb, 2026 Rick Carpenter Common Stock A 1,437 $0.00 25,689 D M
17 Feb, 2026 Mark David Novara Common Stock A 77 $0.00 36,033 D M
17 Feb, 2026 Susan Morrison Common Stock A 1,503 $0.00 42,420 D M
17 Feb, 2026 John F Sheridan Common Stock A 5,471 $0.00 123,071 D M
17 Feb, 2026 Shannon Marie Hansen Common Stock A 531 $0.00 22,005 D M
17 Feb, 2026 Mark David Novara Common Stock A 77 $0.00 36,033 D M
17 Feb, 2026 Leigh Vosseller Common Stock A 1,503 $0.00 39,151 D M
17 Feb, 2026 Shannon Marie Hansen Common Stock D 219 $18.95 21,786 D F
17 Feb, 2026 Leigh Vosseller Common Stock D 619 $18.95 38,532 D F
17 Feb, 2026 John F Sheridan Common Stock D 1,963 $18.95 121,108 D F
17 Feb, 2026 Mark David Novara Common Stock D 62 $18.95 35,971 D F
17 Feb, 2026 Susan Morrison Common Stock D 510 $18.95 41,910 D F
17 Feb, 2026 Rick Carpenter Common Stock D 808 $18.95 24,881 D F