TNDM
Tandem Diabetes Care, Inc.$18.66-1.16 (-5.85%)Prev Close$19.82·MCap$1.42B·P/E—·Vol1.10M·Yield—
▲
Buys (12M)
2
$251.7K
▼
Sells (12M)
9
$206.2K
◆
Net Activity
Net Buyer
$45.5K
●
Active Insiders
9
last 12 mo
Over the past 12 months, insider activity at Tandem Diabetes Care, Inc. (TNDM) has been mixed between buying and selling, with 2 insider purchases totaling $251.7K and 9 insider sales totaling $206.2K. The most recent insider transaction was by Novara Mark David (officer: EVP & CHIEF COMMERCIAL OFFICER), who sold $4.3K worth of shares on Mar 18, 2026. Tandem Diabetes Care, Inc. operates in the Healthcare sector, within the Medical - Devices industry, with a market cap of $1.42B.
TNDM Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Mar 18, 2026 | Novara Mark David | officer: EVP & CHIEF COMMERCIAL OFFICER | Sell | 187 | $23.05 | $4.3K | 37,656 |
| Mar 9, 2026 | Novara Mark David | officer: EVP & CHIEF COMMERCIAL OFFICER | Sell | 2 | $22.81 | $45.62 | 35,969 |
| Feb 17, 2026 | Sheridan John F | PRESIDENT & CEO | Sell | 4,363 | $18.95 | $82.7K | 0 |
| Feb 17, 2026 | Carpenter Rick | Chief Technology Officer | Sell | 1,312 | $18.95 | $24.9K | 0 |
| Feb 17, 2026 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 1,534 | $18.95 | $29.1K | 0 |
| Feb 17, 2026 | Hansen Shannon Marie | EVP & Chief Legal Officer | Sell | 1,263 | $18.95 | $23.9K | 0 |
| Feb 17, 2026 | Morrison Susan | EVP & Chief Admin. Officer | Sell | 882 | $18.95 | $16.7K | 0 |
| Feb 17, 2026 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Sell | 62 | $18.95 | $1.2K | 0 |
| Feb 17, 2026 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Sell | 1,235 | $18.95 | $23.4K | 0 |
| Aug 11, 2025 | Sheridan John F | PRESIDENT & CEO | Buy | 10,000 | $10.23 | $102.3K | 106,327 |
| Aug 11, 2025 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 13,720 | $10.89 | $149.4K | 25,580+116% |
| Mar 11, 2025 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Buy | 10,538 | $18.12 | $191.0K | 10,538 |
| Nov 22, 2024 | BLICKENSTAFF KIM D | Director | Sell | 40,000 | $31.04 | $1.24M | 195,190 |
| Nov 19, 2024 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Buy | 532 | $23.24 | $12.4K | 532 |
| Jun 3, 2024 | Allen Dick | Director | Sell | 5,000 | $51.68 | $258.4K | 0Exit |
| Nov 29, 2023 | Allen Dick | Director | Buy | 5,000 | $18.96 | $94.8K | 19,962+33% |
| Nov 13, 2023 | Hansen Shannon Marie | Chief Legal Officer | Buy | 1,935 | $15.44 | $29.9K | 1,935 |
| Nov 13, 2023 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 6,200 | $15.39 | $95.4K | 11,860+110% |
| Sep 19, 2023 | McGroddy-Goetz Kathleen | Director | Buy | 1,000 | $21.45 | $21.4K | 9,032 |
| May 22, 2023 | Allen Dick | Director | Buy | 10,000 | $29.47 | $294.7K | 12,205+454% |
| May 19, 2023 | Howell Peyton R | Director | Buy | 3,000 | $30.16 | $90.5K | 8,550+54% |
| May 16, 2023 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 3,015 | $32.77 | $98.8K | 5,660+114% |
| Mar 7, 2023 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 10,000 | $41.19 | $411.9K | 3,365-75% |
| Dec 19, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 25,000 | $40.29 | $1.01M | 3,029-89% |
| Jun 10, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 10,097 | $65.02 | $656.5K | 5,554-65% |
| May 19, 2022 | BLICKENSTAFF KIM D | Director | Sell | 10,762 | $92.91 | $999.9K | 205,190 |
| May 10, 2022 | Howell Peyton R | Director | Buy | 2,000 | $74.85 | $149.7K | 2,948+211% |
| May 10, 2022 | Sheridan John F | PRESIDENT & CEO | Buy | 2,500 | $69.90 | $174.8K | 10,058+33% |
| May 10, 2022 | TWOMEY CHRISTOPHER J | Director | Sell | 248 | $111.73 | $27.7K | 7,568 |
| May 10, 2022 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 2,500 | $74.61 | $186.5K | 9,118+38% |
| May 4, 2022 | ROBERTSON REBECCA B | Director | Sell | 1,500 | $96.73 | $145.1K | 967-61% |
| Apr 5, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 1,000 | $117.88 | $117.9K | 4,717 |
| Mar 21, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 5,000 | $108.37 | $541.8K | 4,717-51% |
| Mar 16, 2022 | McGroddy-Goetz Kathleen | Director | Sell | 405 | $106.00 | $42.9K | 814-33% |
| Mar 2, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 1,000 | $112.68 | $112.7K | 4,717 |
| Feb 3, 2022 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $117.91 | $117.9K | 5,209 |
| Feb 3, 2022 | ROBERTSON REBECCA B | Director | Sell | 1,500 | $117.97 | $177.0K | 1,200-56% |
| Jan 5, 2022 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $149.16 | $149.2K | 4,621 |
| Dec 29, 2021 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 1,084 | $151.36 | $164.1K | 1,145-49% |
| Dec 29, 2021 | Leal James | SVP, Operations | Sell | 1,906 | $151.45 | $288.7K | 5,374-26% |
| Dec 17, 2021 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 12,000 | $144.25 | $1.73M | 4,451-73% |
| Dec 9, 2021 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 1,083 | $140.00 | $151.6K | 431-72% |
| Dec 1, 2021 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $128.44 | $128.4K | 4,551 |
| Dec 1, 2021 | Leal James | SVP, Operations | Sell | 1,905 | $130.96 | $249.5K | 4,677-29% |
| Nov 17, 2021 | Morrison Susan | EVP & Chief Admin. Officer | Sell | 34,624 | $142.21 | $4.92M | 8,082-81% |
| Nov 5, 2021 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 21,785 | $140.02 | $3.05M | 243-99% |
| Nov 5, 2021 | Morrison Susan | EVP & Chief Admin. Officer | Sell | 5,376 | $142.00 | $763.4K | 8,082-40% |
| Nov 5, 2021 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | $140.05 | $1.40M | 6,145-62% |
| Nov 3, 2021 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $135.70 | $135.7K | 4,357 |
| Nov 3, 2021 | ROBERTSON REBECCA B | Director | Sell | 1,500 | $135.77 | $203.7K | 278-84% |
Showing 1–50 of 86
1 / 2
TNDM Insider Buying Activity
The following table shows recent insider purchases of Tandem Diabetes Care, Inc. (TNDM) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Aug 11, 2025 | Sheridan John F | PRESIDENT & CEO | Buy | 10,000 | $10.23 | $102.3K | 106,327 |
| Aug 11, 2025 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 13,720 | $10.89 | $149.4K | 25,580+116% |
| Mar 11, 2025 | Kyrillos Jean-Claude | EVP & Chief Operating Officer | Buy | 10,538 | $18.12 | $191.0K | 10,538 |
| Nov 19, 2024 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Buy | 532 | $23.24 | $12.4K | 532 |
| Nov 29, 2023 | Allen Dick | Director | Buy | 5,000 | $18.96 | $94.8K | 19,962+33% |
| Nov 13, 2023 | Hansen Shannon Marie | Chief Legal Officer | Buy | 1,935 | $15.44 | $29.9K | 1,935 |
| Nov 13, 2023 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 6,200 | $15.39 | $95.4K | 11,860+110% |
| Sep 19, 2023 | McGroddy-Goetz Kathleen | Director | Buy | 1,000 | $21.45 | $21.4K | 9,032 |
| May 22, 2023 | Allen Dick | Director | Buy | 10,000 | $29.47 | $294.7K | 12,205+454% |
| May 19, 2023 | Howell Peyton R | Director | Buy | 3,000 | $30.16 | $90.5K | 8,550+54% |
| May 16, 2023 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 3,015 | $32.77 | $98.8K | 5,660+114% |
| May 10, 2022 | Howell Peyton R | Director | Buy | 2,000 | $74.85 | $149.7K | 2,948+211% |
| May 10, 2022 | Sheridan John F | PRESIDENT & CEO | Buy | 2,500 | $69.90 | $174.8K | 10,058+33% |
| May 10, 2022 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Buy | 2,500 | $74.61 | $186.5K | 9,118+38% |
TNDM Insider Selling Activity
The following table shows recent insider sales of Tandem Diabetes Care, Inc. (TNDM) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Mar 18, 2026 | Novara Mark David | officer: EVP & CHIEF COMMERCIAL OFFICER | Sell | 187 | $23.05 | $4.3K | 37,656 |
| Mar 9, 2026 | Novara Mark David | officer: EVP & CHIEF COMMERCIAL OFFICER | Sell | 2 | $22.81 | $45.62 | 35,969 |
| Feb 17, 2026 | Sheridan John F | PRESIDENT & CEO | Sell | 4,363 | $18.95 | $82.7K | 0 |
| Feb 17, 2026 | Carpenter Rick | Chief Technology Officer | Sell | 1,312 | $18.95 | $24.9K | 0 |
| Feb 17, 2026 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 1,534 | $18.95 | $29.1K | 0 |
| Feb 17, 2026 | Hansen Shannon Marie | EVP & Chief Legal Officer | Sell | 1,263 | $18.95 | $23.9K | 0 |
| Feb 17, 2026 | Morrison Susan | EVP & Chief Admin. Officer | Sell | 882 | $18.95 | $16.7K | 0 |
| Feb 17, 2026 | Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | Sell | 62 | $18.95 | $1.2K | 0 |
| Feb 17, 2026 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Sell | 1,235 | $18.95 | $23.4K | 0 |
| Nov 22, 2024 | BLICKENSTAFF KIM D | Director | Sell | 40,000 | $31.04 | $1.24M | 195,190 |
| Jun 3, 2024 | Allen Dick | Director | Sell | 5,000 | $51.68 | $258.4K | 0Exit |
| Mar 7, 2023 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 10,000 | $41.19 | $411.9K | 3,365-75% |
| Dec 19, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 25,000 | $40.29 | $1.01M | 3,029-89% |
| Jun 10, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 10,097 | $65.02 | $656.5K | 5,554-65% |
| May 19, 2022 | BLICKENSTAFF KIM D | Director | Sell | 10,762 | $92.91 | $999.9K | 205,190 |
| May 10, 2022 | TWOMEY CHRISTOPHER J | Director | Sell | 248 | $111.73 | $27.7K | 7,568 |
| May 4, 2022 | ROBERTSON REBECCA B | Director | Sell | 1,500 | $96.73 | $145.1K | 967-61% |
| Apr 5, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 1,000 | $117.88 | $117.9K | 4,717 |
| Mar 21, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 5,000 | $108.37 | $541.8K | 4,717-51% |
| Mar 16, 2022 | McGroddy-Goetz Kathleen | Director | Sell | 405 | $106.00 | $42.9K | 814-33% |
| Mar 2, 2022 | BERGER DAVID B | EVP & Chief Operating Officer | Sell | 1,000 | $112.68 | $112.7K | 4,717 |
| Feb 3, 2022 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $117.91 | $117.9K | 5,209 |
| Feb 3, 2022 | ROBERTSON REBECCA B | Director | Sell | 1,500 | $117.97 | $177.0K | 1,200-56% |
| Jan 5, 2022 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $149.16 | $149.2K | 4,621 |
| Dec 29, 2021 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 1,084 | $151.36 | $164.1K | 1,145-49% |
| Dec 29, 2021 | Leal James | SVP, Operations | Sell | 1,906 | $151.45 | $288.7K | 5,374-26% |
| Dec 17, 2021 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 12,000 | $144.25 | $1.73M | 4,451-73% |
| Dec 9, 2021 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 1,083 | $140.00 | $151.6K | 431-72% |
| Dec 1, 2021 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $128.44 | $128.4K | 4,551 |
| Dec 1, 2021 | Leal James | SVP, Operations | Sell | 1,905 | $130.96 | $249.5K | 4,677-29% |
| Nov 17, 2021 | Morrison Susan | EVP & Chief Admin. Officer | Sell | 34,624 | $142.21 | $4.92M | 8,082-81% |
| Nov 5, 2021 | Gasser Elizabeth Anne | EVP, Chief Strategy Officer | Sell | 21,785 | $140.02 | $3.05M | 243-99% |
| Nov 5, 2021 | Morrison Susan | EVP & Chief Admin. Officer | Sell | 5,376 | $142.00 | $763.4K | 8,082-40% |
| Nov 5, 2021 | Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | Sell | 10,000 | $140.05 | $1.40M | 6,145-62% |
| Nov 3, 2021 | BERGER DAVID B | EVP, Bus Ops & Compliance | Sell | 1,000 | $135.70 | $135.7K | 4,357 |
| Nov 3, 2021 | ROBERTSON REBECCA B | Director | Sell | 1,500 | $135.77 | $203.7K | 278-84% |
TNDM Insiders
Novara Mark David
officer: EVP & CHIEF COMMERCIAL OFFICER
Bought $12.4KSold $5.5K
4 tradesLast: Mar 18, 2026
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