Leigh Vosseller insider trades: Tandem Diabetes Care (TNDM) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Leigh reports to the SEC
Open-market buys and sales
19 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 8, 2025 | TNDM | ↑ Buy | 13,720 | $10.89 | $149K | Leigh A. Vosseller Trust | Aug 11, 2025 (3d) |
| Nov 8, 2023 | TNDM | ↑ Buy | 6,200 | $15.39 | $95K | Leigh A. Vosseller Trust | Nov 13, 2023 (5d) |
| May 12, 2023 | TNDM | ↑ Buy | 3,015 | $32.77 | $99K | Leigh A. Vosseller Trust | May 16, 2023 (4d) |
| May 9, 2022 | TNDM | ↑ Buy | 2,500 | $74.61 | $187K | Direct | May 10, 2022 (1d) |
| Nov 3, 2021 | TNDM | ↓ Sell | 10,000 | $140.05 | $1.4M | Direct | Nov 5, 2021 (2d) |
| Oct 14, 2021 | TNDM | ↓ Sell | 20,000 | $132.55 | $2.7M | Direct | Oct 14, 2021 (0d) |
| Sep 16, 2021 | TNDM | ↓ Sell | 10,000 | $125.00 | $1.3M | Direct | Sep 17, 2021 (1d) |
| Sep 13, 2021 | TNDM | ↓ Sell | 10,000 | $120.75 | $1.2M | Direct | Sep 15, 2021 (2d) |
| Oct 13, 2020 | TNDM | ↓ Sell | 10,000 | $120.87 | $1.2M | Direct | Oct 15, 2020 (2d) |
| Jul 31, 2020 | TNDM | ↓ Sell | 10,000 | $110.03 | $1.1M | Direct | Aug 4, 2020 (4d) |
| Jul 6, 2020 | TNDM | ↓ Sell | 10,000 | $105.04 | $1.1M | Direct | Jul 7, 2020 (1d) |
| Jul 2, 2020 | TNDM | ↓ Sell | 20,000 | $97.74 | $2.0M | Direct | Jul 2, 2020 (0d) |
| May 7, 2020 | TNDM | ↓ Sell | 10,000 | $90.07 | $901K | Direct | May 8, 2020 (1d) |
| Feb 11, 2020 | TNDM | ↓ Sell | 10,000 | $80.04 | $800K | Direct | Feb 12, 2020 (1d) |
| Jan 29, 2020 | TNDM | ↓ Sell | 10,000 | $75.93 | $759K | Direct | Jan 31, 2020 (2d) |
| Nov 25, 2019 | TNDM | ↓ Sell | 10,000 | $70.35 | $704K | Direct | Nov 26, 2019 (1d) |
| Nov 18, 2019 | TNDM | ↓ Sell | 10,000 | $65.41 | $654K | Direct | Nov 18, 2019 (0d) |
| May 16, 2019 | TNDM | ↓ Sell | 10,000 | $70.45 | $705K | Direct | May 17, 2019 (1d) |
| May 3, 2019 | TNDM | ↓ Sell | 10,000 | $65.14 | $651K | Direct | May 6, 2019 (3d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other TNDM insiders
Open-market trades in the last 12 months
About Leigh Vosseller's insider trades
Leigh Vosseller is EVP & Chief Financial Officer at Tandem Diabetes Care (TNDM). Since May 3, 2019, Leigh has reported 4 open-market purchases worth $530K and 15 sales worth $17.0M on SEC Form 4. There have been no open-market trades in the last 12 months.
Their filings also include option exercises (46 filings), shares withheld for taxes (31 filings), grants and awards (18 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every TNDM insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.