TANDEM DIABETES CARE INC Insider Trading Activity
Every SEC Form 4 insider transaction reported for TANDEM DIABETES CARE INC (TNDM), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are TNDM insiders buying or selling?
In the last 12 months, TANDEM DIABETES CARE INC insiders reported 0 open-market purchases ($0) and 2 sales ($4.4K) — net selling of $4.4K. Since February 2018, Trabud has recorded 181 Form 4 filings for TNDM: 22 buys ($5.8M) and 159 sells ($292.0M).
Source: SEC EDGAR Form 4
What stands out
- No TANDEM DIABETES CARE INC insider made an open-market purchase in the last 12 months; the 2 reported open-market sales totaled $4.4K.
Key Statistics (February 2018 – Mar 18, 2026)
Total Form 4 filings
181
SEC EDGAR
Insider filers
20
Insider buys (22)
$5.8M
Insider sells (159)
$292.0M
Insider sentiment
Net sellingNet insider flow of $286.2M in net selling since February 2018, and $4.4K in net selling over the last 12 months.
Recent TNDM insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Mar 18, 2026 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | Sale | 187 | $23.05 | $4.3K | SEC ↗ |
| Mar 9, 2026 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | Sale | 2 | $22.81 | $45.62 | SEC ↗ |
| Aug 11, 2025 | John F Sheridan | PRESIDENT & CEO | Purchase | 10.0K | $10.23 | $102.3K | SEC ↗ |
| Aug 11, 2025 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | Purchase | 13.7K | $10.89 | $149.4K | SEC ↗ |
| Mar 11, 2025 | Jean-Claude Kyrillos | EVP & Chief Operating Officer | Purchase | 10.5K | $18.12 | $191.0K | SEC ↗ |
| Nov 22, 2024 | Kim D Blickenstaff | Director | Sale | 40.0K | $31.04 | $1.2M | SEC ↗ |
| Nov 19, 2024 | Mark David Novara | EVP & CHIEF COMMERCIAL OFFICER | Purchase | 532 | $23.24 | $12.4K | SEC ↗ |
| Jun 3, 2024 | Dick Allen | Director | Sale | 5.0K | $51.68 | $258.4K | SEC ↗ |
| Nov 29, 2023 | Dick Allen | Director | Purchase | 5.0K | $18.96 | $94.8K | SEC ↗ |
| Nov 13, 2023 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | Purchase | 6.2K | $15.39 | $95.4K | SEC ↗ |
| Nov 13, 2023 | Shannon Marie Hansen | Chief Legal Officer | Purchase | 1.9K | $15.44 | $29.9K | SEC ↗ |
| Sep 19, 2023 | Kathleen Mcgroddy-Goetz | Director | Purchase | 1.0K | $21.45 | $21.4K | SEC ↗ |
| May 23, 2023 | Dick Allen | Director | Purchase | 10.0K | $29.47 | $294.7K | SEC ↗ |
| May 19, 2023 | Peyton R Howell | Director | Purchase | 3.0K | $30.16 | $90.5K | SEC ↗ |
| May 16, 2023 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | Purchase | 3.0K | $32.77 | $98.8K | SEC ↗ |
| Mar 7, 2023 | David B Berger | EVP & Chief Operating Officer | Sale | 10.0K | $41.19 | $411.9K | SEC ↗ |
| Dec 19, 2022 | David B Berger | EVP & Chief Operating Officer | Sale | 25.0K | $40.29 | $1.0M | SEC ↗ |
| Jun 10, 2022 | David B Berger | EVP & Chief Operating Officer | Sale | 10.1K | $65.02 | $656.5K | SEC ↗ |
| May 19, 2022 | Kim D Blickenstaff | Director | Sale | 10.8K | $92.91 | $999.9K | SEC ↗ |
| May 10, 2022 | Leigh Vosseller | EVP & CHIEF FINANCIAL OFFICER | Purchase | 2.5K | $74.61 | $186.5K | SEC ↗ |
| May 10, 2022 | John F Sheridan | PRESIDENT & CEO | Purchase | 2.5K | $69.90 | $174.8K | SEC ↗ |
| May 10, 2022 | Peyton R Howell | Director | Purchase | 2.0K | $74.85 | $149.7K | SEC ↗ |
| May 10, 2022 | Christopher J Twomey | Director | Sale | 248 | $111.73 | $27.7K | SEC ↗ |
| May 4, 2022 | Rebecca B Robertson | Director | Sale | 1.5K | $96.73 | $145.1K | SEC ↗ |
| Apr 5, 2022 | David B Berger | EVP & Chief Operating Officer | Sale | 1.0K | $117.88 | $117.9K | SEC ↗ |
Showing the 25 most recent of 181 Form 4 filings for TANDEM DIABETES CARE INC.
Most active TNDM insiders
- David B Berger37 filings
- Kim D Blickenstaff26 filings
- Leigh Vosseller19 filings
- Brian B Hansen16 filings
- Dick Allen13 filings
Ask anything about TNDM insider activity
Use Trabud's AI agent to query TANDEM DIABETES CARE INC's Form 4 history in plain English — "Show me TNDM CEO purchases this year" or compare it against any other ticker.
Open the AI agentTNDM insider trading FAQ
Are TANDEM DIABETES CARE INC insiders buying or selling?
In the last 12 months, TANDEM DIABETES CARE INC insiders reported 0 open-market purchases ($0) and 2 sales ($4.4K) — net selling of $4.4K. Since February 2018, Trabud has recorded 181 Form 4 filings for TNDM: 22 buys ($5.8M) and 159 sells ($292.0M). Over the full record that is net selling of $286.2M.
How many insiders trade TNDM stock?
20 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for TANDEM DIABETES CARE INC. The most recent filing was accepted on Mar 18, 2026.
Where does Trabud get TNDM insider trading data?
All TNDM insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.