Christopher J Twomey 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 Christopher reports to the SEC
Open-market buys and sales
18 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Oct 27, 2026 | TNDM | ↓ Sell | 1,700 | $19.15 | $33K | Direct | Oct 29, 2026 (2d) |
| May 5, 2022 | TNDM | ↓ Sell | 248 | $111.73 | $28K | Indirect | May 10, 2022 (5d) |
| Sep 7, 2021 | TNDM | ↓ Sell | 304 | $123.00 | $37K | Indirect | Sep 9, 2021 (2d) |
| Sep 2, 2021 | TNDM | ↓ Sell | 8,696 | $115.00 | $1.0M | Indirect | Sep 3, 2021 (1d) |
| Jul 29, 2021 | TNDM | ↓ Sell | 8,000 | $105.00 | $840K | Indirect | Jul 30, 2021 (1d) |
| May 19, 2021 | TNDM | ↓ Sell | 269 | $89.03 | $24K | Indirect | May 20, 2021 (1d) |
| Apr 22, 2021 | TNDM | ↓ Sell | 8,000 | $95.01 | $760K | Indirect | Apr 23, 2021 (1d) |
| Jul 31, 2020 | TNDM | ↓ Sell | 7,500 | $110.04 | $825K | Indirect | Aug 4, 2020 (4d) |
| Jul 2, 2020 | TNDM | ↓ Sell | 7,500 | $100.28 | $752K | Indirect | Jul 7, 2020 (5d) |
| May 7, 2020 | TNDM | ↓ Sell | 7,500 | $90.03 | $675K | Indirect | May 8, 2020 (1d) |
| Apr 30, 2020 | TNDM | ↓ Sell | 4,308 | $80.00 | $345K | Indirect | May 4, 2020 (4d) |
| Aug 23, 2018 | BNGO | ↑ Buy | 10,000 | $6.13 | $61K | Direct | Aug 27, 2018 (4d) |
| Feb 9, 2018 | TNDM | ↑ Buy | 75,000 | $2.00 | $150K | Indirect | Feb 13, 2018 (4d) |
| Jun 20, 2007 | BSTE | ↓ Sell | 3,003 | $92.33 | $277K | Direct | Jun 21, 2007 (1d) |
| Jun 7, 2007 | BSTE | ↓ Sell | 157,200 | $92.02 | $14.5M | Direct | Jun 7, 2007 (0d) |
| Jun 6, 2007 | BSTE | ↓ Sell | 6,200 | $92.00 | $570K | Direct | Jun 6, 2007 (0d) |
| Jun 5, 2007 | BSTE | ↓ Sell | 7,100 | $92.01 | $653K | Direct | Jun 5, 2007 (0d) |
| Jun 4, 2007 | BSTE | ↓ Sell | 54,000 | $92.00 | $5.0M | Direct | Jun 4, 2007 (0d) |
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 Christopher J Twomey's insider trades
Christopher J Twomey is a director at Tandem Diabetes Care (TNDM). Since Jun 4, 2007, Christopher has reported 2 open-market purchases worth $211K and 16 sales worth $26.3M on SEC Form 4. In the last 12 months: 1 sale ($33K).
Their filings also include grants and awards (51 filings), option exercises (15 filings), gifts (7 filings), other transactions (5 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.