Updated Jul 16, 2026 · Last SEC filing 2026-06-04
TANDEM DIABETES CARE INC (TNDM) has filed 26 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-04. 3 Form 8-K material event filings were reported by TNDM in the last 90 days. 2 Form 144 notices of proposed sale were filed for TNDM stock. InsiderAlpha tracks every TNDM SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Surgical & Medical Instruments & Apparatus (SIC 3841) |
|---|---|
| SEC CIK | 0001438133 |
| Form 4 filings (90d) | 26 |
|---|---|
| Form 8-K filings (90d) | 3 |
| Form 144 notices (90d) | 2 |
| Latest Form 4 filing | 2026-06-04 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Gasser Elizabeth Anne | EVP, Chief Strategy Officer | G — Bona-fide gift | 7.2K | $0.00 | — | SEC | |
| Gasser Elizabeth Anne | EVP, Chief Strategy Officer | G — Bona-fide gift | 7.2K | $0.00 | — | SEC | |
| Allen Dick | Insider | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| Howell Peyton R | Director | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| ROBERTSON REBECCA B | Director | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| Malagueira Joao Paulo Falcao | Director | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| Sodhi Rajwant | Director | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| McGroddy-Goetz Kathleen | Director | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| TWOMEY CHRISTOPHER J | Director | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| Cha Myoungil | Director | M — Option exercise | 8.8K | $0.00 | — | SEC | |
| Morrison Susan | EVP & Chief Admin. Officer | F — Tax withholding / forfeiture | 314 | $12.82 | $4K | SEC | |
| Kyrillos Jean-Claude | EVP & Chief Operating Officer | A — Grant or award | 434 | $10.90 | $5K | SEC | |
| Morrison Susan | EVP & Chief Admin. Officer | F — Tax withholding / forfeiture | 430 | $12.82 | $6K | SEC | |
| Morrison Susan | EVP & Chief Admin. Officer | M — Option exercise | 1.1K | $0.00 | — | SEC | |
| Kyrillos Jean-Claude | EVP & Chief Operating Officer | F — Tax withholding / forfeiture | 2.1K | $12.82 | $27K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for TANDEM DIABETES CARE INC (TNDM). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Gasser Elizabeth Anne | 13 | $85K |
| Sheridan John F | 11 | $332K |
| Vosseller Leigh | 11 | $77K |
| Hansen Shannon Marie | 11 | $87K |
| Carpenter Rick | 11 | $72K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in TNDM insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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