Tandem Diabetes Care Inc
TNDM- Exchange
- Nasdaq
- Industry
- Surgical & Medical Instruments & Apparatus
- SEC CIK
- 0001438133
No open-market purchases or sales by Tandem Diabetes Care Inc insiders were filed in the last 90 days; 274 institutions reported holding it in 13F filings for Q2 2026, worth $1.19B in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Tandem Diabetes Care Inc insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 0 filings
- Insiders trading
- 0
- Net value
- $0
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Tandem Diabetes Care Inc, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Vosseller Leigh | EVP & CHIEF FINANCIAL OFFICER | 52,040 | Aug 18, 2026 | 5 |
| Sheridan John F | PRESIDENT & CEO | 160,260 | Aug 18, 2026 | 5 |
| Morrison Susan | EVP & Chief Admin. Officer | 52,788 | Aug 18, 2026 | 5 |
| Kyrillos Jean-Claude | EVP & Chief Operating Officer | 30,290 | Aug 18, 2026 | 8 |
| Gasser Elizabeth Anne | EVP, Chief Strategy Officer | 1,396 | Aug 18, 2026 | 7 |
| Carpenter Rick | EVP & Chief Technology Officer | 32,148 | Aug 18, 2026 | 6 |
| Hansen Shannon Marie | EVP & Chief Legal Officer | 31,650 | Aug 18, 2026 | 5 |
| Robertson Rebecca B | Director | 22,542 | May 22, 2026 | 1 |
| Twomey Christopher J | Director | 24,434 | May 22, 2026 | 1 |
| Howell Peyton R | Director | 29,836 | May 22, 2026 | 1 |
| Allen Dick | Other: Chair Emeritus | 28,146 | May 22, 2026 | 1 |
| Sodhi Rajwant | Director | 24,280 | May 22, 2026 | 1 |
| McGroddy-Goetz Kathleen | Director | 26,612 | May 22, 2026 | 1 |
| Cha Myoungil | Director | 22,458 | May 22, 2026 | 1 |
| Malagueira Joao Paulo Falcao | Director | 22,458 | May 22, 2026 | 1 |
| Beaver Sandra | Director | – | May 22, 2026 | 2 |
| Novara Mark David | EVP & CHIEF COMMERCIAL OFFICER | 40,317 | May 19, 2026 | 6 |
| Blickenstaff Kim D | Director | 165,190Indirect | Nov 22, 2024 | 0 |
| Leal James | Chief Manufacturing Officer | 16,876 | May 28, 2024 | 0 |
| Berger David B | EVP & Chief Operating Officer | 6,338 | Nov 29, 2023 | 0 |
| Hansen Brian B | EVP & CHIEF COMMERCIAL OFFICER | 12,622 | Nov 29, 2023 | 0 |
| Roeder Douglas A | Director | 2,205 | May 19, 2022 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 17, 2021 (view filing) | Sep 15 | 2 days | Berger David BEVP, Bus Ops & Compliance | SSale | −9.00K | $122.00 | −$1.10M | −67.9%4.25K after | 3 lots |
| Sep 15, 2021 (view filing) | Sep 13 | 2 days | Vosseller LeighEVP & CHIEF FINANCIAL OFFICER | SSale | −10.0K | $120.75 | −$1.21M | −61.9%6.14K after | 3 lots |
| Sep 15, 2021 (view filing) | Sep 13 | 2 days | Hansen Brian BEVP & CHIEF COMMERCIAL OFFICER | SSale | −32.2K | $119.00 | −$3.83M | −83.6%6.33K after | 5 lots |
| Sep 9, 2021 (view filing) | Sep 7 | 2 days | Leal JamesSVP, Operations | SSale | −3.57K | $123.00 | −$439.6K | −48.8%3.75K after | |
| Sep 9, 2021 (view filing) | Sep 7 | 2 days | Twomey Christopher JDirector | SSale | −304 | $123.00 | −$37.4K | −3.9%7.53K after | |
| Sep 3, 2021 (view filing) | Sep 2 | 1 day | Twomey Christopher JDirector | SSale | −8.70K | $115.01 | −$1.00M | −52.6%7.84K after | 2 lots |
| Sep 3, 2021 (view filing) | Sep 2 | 1 day | Blickenstaff Kim DDirector | SSale | −28.7K | $113.36 | −$3.25M | −12.4%202.4K after | 2 lots |
| Aug 31, 2021 (view filing) | Aug 27 | 4 days | Leal JamesSVP, Operations | SSale | −1.67K | $110.64 | −$184.4K | −30.8%3.75K after | 2 lots |
| Aug 18, 2021 (view filing) | Aug 16-17 | 2 days | Berger David BEVP, Chief Business/Compliance | SSale | −10.0K | $109.85 | −$1.10M | −71.2%4.04K after | 2 lots |
| Aug 18, 2021 (view filing) | Aug 16-17 | 2 days | Blickenstaff Kim DDirector | SSale | −50.0K | $108.96 | −$5.45M | −19.8%202.4K after | 3 lots |
| Aug 16, 2021 (view filing) | Aug 12-13 | 4 days | Blickenstaff Kim DDirector | SSale | −64.0K | $106.83 | −$6.84M | −20.2%252.4K after | 2 lots |
| Aug 12, 2021 (view filing) | Aug 10 | 2 days | Blickenstaff Kim DDirector | SSale | −3.21K | $107.21 | −$344.1K | −1.0%316.4K after | |
| Aug 10, 2021 (view filing) | Aug 6-9 | 4 days | Sheridan John FPRESIDENT & CEO | SSale | −14.9K | $108.04 | −$1.61M | −70.7%6.20K after | 4 lots |
| Aug 10, 2021 (view filing) | Aug 6-9 | 4 days | Blickenstaff Kim DDirector | SSale | −82.8K | $107.70 | −$8.92M | −20.6%319.6K after | 3 lots |
| Aug 3, 2021 (view filing) | Aug 2 | 1 day | Robertson Rebecca BDirector | SSale | −1.50K | $107.51 | −$161.3K | −79.3%392 after | |
| Aug 3, 2021 (view filing) | Jul 30 | 4 days | Allen DickDirector | SSale | −2.53K | $107.00 | −$270.3K | −33.6%5.00K after | |
| Jul 30, 2021 (view filing) | Jul 29 | 1 day | Twomey Christopher JDirector | SSale | −8.00K | $105.00 | −$840.0K | −41.0%11.5K after | 2 lots |
| Jul 29, 2021 (view filing) | Jul 27 | 2 days | Leal JamesSVP, Operations | SSale | −1.67K | $102.25 | −$170.3K | −31.7%3.60K after |