Transactions
34
Insider / TANDEM DIABETES CARE INC
Gasser Elizabeth Anne
EVP, Chief Strategy Officer at TANDEM DIABETES CARE INC
- Company
- TANDEM DIABETES CARE INC
- Ticker
- TNDM
- First filing on record
- November 19, 2025
- Latest trade on record
- August 15, 2026
- SEC filings
- EDGAR ↗
Gasser Elizabeth Anne, EVP, Chief Strategy Officer at TANDEM DIABETES CARE INC, has disclosed 34 transactions in TNDM since November 19, 2025: 0 purchases (0 open-market buys) and 9 sales, worth about $186K at the reported prices. The latest was filed August 18, 2026, 3 days after the trade.
Open-market buys
0
Sales
9
Avg. disclosure lag
2.9d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Gasser Elizabeth Anne made no purchases and 9 sales worth $162K, plus 25 other transactions. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Gasser Elizabeth Anne has traded 1 stock on record; the largest by dollars is TNDM.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
0 of 7 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| M | Option exercise or conversion | 18 | 36,960 | — |
| F | Shares withheld for tax | 9 | 10,054 | $162K |
| A | Grant or award | 3 | 31,059 | $24K |
| G | Gift | 2 | 14,320 | — |
| J | Other acquisition or disposal | 2 | 6,000 | — |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 25 | 0 | 7 · $136K |
| 2025 | 9 | 0 | 2 · $26K |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| TNDM | Option / conversion M | August 15, 2026 | August 18, 2026 | 3d | 1,917 | — | — | derivative | Form 4 ↗ | |
| TNDM | Option / conversion M | August 15, 2026 | August 18, 2026 | 3d | 1,097 | — | — | derivative | Form 4 ↗ | |
| TNDM | Sell F | August 15, 2026 | August 18, 2026 | 3d | 1,029 | $23 | $23K | Form 4 ↗ | ||
| TNDM | Option / conversion M | August 15, 2026 | August 18, 2026 | 3d | 1,917 | — | — | Form 4 ↗ | ||
| TNDM | Sell F | August 15, 2026 | August 18, 2026 | 3d | 589 | $23 | $13K | Form 4 ↗ | ||
| TNDM | Option / conversion M | August 15, 2026 | August 18, 2026 | 3d | 1,097 | — | — | Form 4 ↗ | ||
| TNDM | Other G | June 2, 2026 | June 4, 2026 | 2d | 7,160 | — | — | indirect | Form 4 ↗ | |
| TNDM | Other G | June 2, 2026 | June 4, 2026 | 2d | 7,160 | — | — | Form 4 ↗ | ||
| TNDM | Other A | May 29, 2026 | June 2, 2026 | 4d | 29,136 | — | — | derivative | Form 4 ↗ | |
| TNDM | Option / conversion M | May 15, 2026 | May 19, 2026 | 4d | 7,667 | — | — | derivative | Form 4 ↗ | |
| TNDM | Option / conversion M | May 15, 2026 | May 19, 2026 | 4d | 1,097 | — | — | derivative | Form 4 ↗ | |
| TNDM | Option / conversion M | May 15, 2026 | May 19, 2026 | 4d | 1,503 | — | — | derivative | Form 4 ↗ | |
| TNDM | Other A | May 15, 2026 | May 19, 2026 | 4d | 1,337 | $11 | $15K | Form 4 ↗ | ||
| TNDM | Sell F | May 15, 2026 | May 19, 2026 | 4d | 4,114 | $13 | $53K | Form 4 ↗ | ||
| TNDM | Option / conversion M | May 15, 2026 | May 19, 2026 | 4d | 7,667 | — | — | Form 4 ↗ | ||
| TNDM | Sell F | May 15, 2026 | May 19, 2026 | 4d | 589 | $13 | $7,551 | Form 4 ↗ | ||
| TNDM | Option / conversion M | May 15, 2026 | May 19, 2026 | 4d | 1,097 | — | — | Form 4 ↗ | ||
| TNDM | Sell F | May 15, 2026 | May 19, 2026 | 4d | 807 | $13 | $10K | Form 4 ↗ | ||
| TNDM | Option / conversion M | May 15, 2026 | May 19, 2026 | 4d | 1,503 | — | — | Form 4 ↗ | ||
| TNDM | Option / conversion M | February 17, 2026 | February 19, 2026 | 2d | 1,097 | — | — | derivative | Form 4 ↗ | |
| TNDM | Option / conversion M | February 17, 2026 | February 19, 2026 | 2d | 1,503 | — | — | derivative | Form 4 ↗ | |
| TNDM | Sell F | February 17, 2026 | February 19, 2026 | 2d | 647 | $19 | $12K | Form 4 ↗ | ||
| TNDM | Option / conversion M | February 17, 2026 | February 19, 2026 | 2d | 1,097 | — | — | Form 4 ↗ | ||
| TNDM | Sell F | February 17, 2026 | February 19, 2026 | 2d | 887 | $19 | $17K | Form 4 ↗ | ||
| TNDM | Option / conversion M | February 17, 2026 | February 19, 2026 | 2d | 1,503 | — | — | Form 4 ↗ | ||
| TNDM | Other J | December 4, 2025 | December 8, 2025 | 4d | 3,000 | — | — | indirect | Form 4 ↗ | |
| TNDM | Other J | December 4, 2025 | December 8, 2025 | 4d | 3,000 | — | — | Form 4 ↗ | ||
| TNDM | Option / conversion M | November 17, 2025 | November 19, 2025 | 2d | 1,096 | — | — | derivative | Form 4 ↗ | |
| TNDM | Option / conversion M | November 17, 2025 | November 19, 2025 | 2d | 1,503 | — | — | derivative | Form 4 ↗ | |
| TNDM | Sell F | November 17, 2025 | November 19, 2025 | 2d | 587 | $19 | $11K | Form 4 ↗ | ||
| TNDM | Option / conversion M | November 17, 2025 | November 19, 2025 | 2d | 1,096 | — | — | Form 4 ↗ | ||
| TNDM | Sell F | November 17, 2025 | November 19, 2025 | 2d | 805 | $19 | $15K | Form 4 ↗ | ||
| TNDM | Option / conversion M | November 17, 2025 | November 19, 2025 | 2d | 1,503 | — | — | Form 4 ↗ | ||
| TNDM | Other A | November 17, 2025 | November 19, 2025 | 2d | 586 | $16 | $9,136 | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| August 18, 2026 | Form 4 | 0001438133-26-000128 | 6 | published | EDGAR ↗ |
| June 4, 2026 | Form 4 | 0001438133-26-000115 | 2 | published | EDGAR ↗ |
| June 2, 2026 | Form 4 | 0001438133-26-000112 | 1 | published | EDGAR ↗ |
| May 19, 2026 | Form 4 | 0001438133-26-000066 | 10 | published | EDGAR ↗ |
| February 19, 2026 | Form 4 | 0001438133-26-000019 | 6 | published | EDGAR ↗ |
| December 8, 2025 | Form 4 | 0001438133-25-000223 | 2 | published | EDGAR ↗ |
| November 19, 2025 | Form 4 | 0001438133-25-000212 | 7 | published | EDGAR ↗ |
Other insiders at TANDEM DIABETES CARE INC
- Hansen Shannon Marie EVP & Chief Legal Officer 36 rows
- Carpenter Rick Chief Technology Officer 33 rows
- Morrison Susan EVP & Chief Admin. Officer 29 rows
- Sheridan John F PRESIDENT & CEO 29 rows
- Vosseller Leigh EVP & CHIEF FINANCIAL OFFICER 29 rows
- Kyrillos Jean-Claude EVP & Chief Operating Officer 24 rows
- Novara Mark David EVP & CHIEF COMMERCIAL OFFICER 20 rows
- Allen Dick Insider 3 rows
- Cha Myoungil Director 3 rows
- Howell Peyton R Director 3 rows
Everyone on file, with contracts and lobbying under the company's name: TANDEM DIABETES CARE INC.
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Options and derivatives on Form 4 Table I = shares. Table II = options and other derivatives.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 7 | 34 | November 19, 2025 | August 18, 2026 | Form 4 list on EDGAR |
Site built October 27, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.