John F Sheridan 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 John reports to the SEC
Open-market buys and sales
41 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 11, 2025 | TNDM | ↑ Buy | 10,000 | $10.23 | $102K | Direct | Aug 11, 2025 (0d) |
| May 9, 2022 | TNDM | ↑ Buy | 2,500 | $69.90 | $175K | Direct | May 10, 2022 (1d) |
| Aug 9, 2021 | TNDM | ↓ Sell | 14,926 | $108.04 | $1.6M | Direct | Aug 10, 2021 (1d) |
| Oct 13, 2020 | TNDM | ↓ Sell | 15,000 | $121.31 | $1.8M | Direct | Oct 15, 2020 (2d) |
| Sep 16, 2020 | TNDM | ↓ Sell | 10,000 | $110.02 | $1.1M | Direct | Sep 17, 2020 (1d) |
| Aug 3, 2020 | TNDM | ↓ Sell | 33,200 | $102.21 | $3.4M | Direct | Aug 4, 2020 (1d) |
| Feb 21, 2020 | TNDM | ↓ Sell | 30,000 | $87.86 | $2.6M | Direct | Feb 24, 2020 (3d) |
| Nov 25, 2019 | TNDM | ↓ Sell | 462 | $70.00 | $32K | Direct | Nov 26, 2019 (1d) |
| Sep 6, 2019 | TNDM | ↓ Sell | 9,538 | $70.03 | $668K | Direct | Sep 9, 2019 (3d) |
| Feb 27, 2019 | TNDM | ↓ Sell10b5-1 | 20,000 | $62.03 | $1.2M | Direct | Feb 27, 2019 (0d) |
| Jan 25, 2019 | TNDM | ↓ Sell10b5-1 | 20,000 | $45.26 | $905K | Direct | Jan 25, 2019 (0d) |
| Jan 2, 2019 | TNDM | ↓ Sell | 20,788 | $35.76 | $743K | Direct | Jan 3, 2019 (1d) |
| Aug 1, 2016 | TNDM | ↓ Sell | 15,000 | $6.52 | $98K | Direct | Aug 3, 2016 (2d) |
| May 2, 2016 | TNDM | ↓ Sell10b5-1 | 2,000 | $10.61 | $21K | Direct | May 2, 2016 (0d) |
| Apr 22, 2016 | TNDM | ↓ Sell10b5-1 | 2,000 | $10.00 | $20K | Direct | Apr 22, 2016 (0d) |
| Mar 7, 2016 | TNDM | ↓ Sell10b5-1 | 4,000 | $10.01 | $40K | Direct | Mar 9, 2016 (2d) |
| Jan 4, 2016 | TNDM | ↓ Sell10b5-1 | 2,000 | $11.47 | $23K | Direct | Jan 5, 2016 (1d) |
| Dec 1, 2015 | TNDM | ↓ Sell10b5-1 | 2,000 | $10.14 | $20K | Direct | Dec 2, 2015 (1d) |
| Nov 2, 2015 | TNDM | ↓ Sell10b5-1 | 4,000 | $10.00 | $40K | Direct | Nov 3, 2015 (1d) |
| Sep 14, 2015 | TNDM | ↓ Sell10b5-1 | 2,000 | $12.51 | $25K | Direct | Sep 16, 2015 (2d) |
| Aug 6, 2015 | TNDM | ↓ Sell | 35,000 | $12.45 | $436K | Direct | Aug 7, 2015 (1d) |
| May 1, 2015 | TNDM | ↓ Sell10b5-1 | 2,000 | $13.72 | $27K | Direct | May 1, 2015 (0d) |
| Apr 1, 2015 | TNDM | ↓ Sell10b5-1 | 2,000 | $12.47 | $25K | Direct | Apr 3, 2015 (2d) |
| Mar 2, 2015 | TNDM | ↓ Sell10b5-1 | 2,000 | $11.76 | $24K | Direct | Mar 4, 2015 (2d) |
| Feb 2, 2015 | TNDM | ↓ Sell10b5-1 | 2,000 | $12.06 | $24K | Direct | Feb 3, 2015 (1d) |
| Jan 2, 2015 | TNDM | ↓ Sell10b5-1 | 2,000 | $12.75 | $26K | Direct | Jan 5, 2015 (3d) |
| Dec 1, 2014 | TNDM | ↓ Sell10b5-1 | 2,000 | $13.55 | $27K | Direct | Dec 2, 2014 (1d) |
| Nov 3, 2014 | TNDM | ↓ Sell10b5-1 | 2,000 | $16.00 | $32K | Direct | Nov 5, 2014 (2d) |
| Oct 1, 2014 | TNDM | ↓ Sell10b5-1 | 2,000 | $13.07 | $26K | Direct | Oct 3, 2014 (2d) |
| Sep 2, 2014 | TNDM | ↓ Sell10b5-1 | 2,000 | $13.99 | $28K | Direct | Sep 3, 2014 (1d) |
| Aug 1, 2014 | TNDM | ↓ Sell10b5-1 | 2,000 | $15.04 | $30K | Direct | Aug 4, 2014 (3d) |
| Jul 1, 2014 | TNDM | ↓ Sell10b5-1 | 2,000 | $16.42 | $33K | Direct | Jul 2, 2014 (1d) |
| Jun 18, 2014 | TNDM | ↓ Sell10b5-1 | 2,000 | $16.75 | $34K | Direct | Jun 20, 2014 (2d) |
| Feb 4, 2010 | VOLC | ↓ Sell | 2,383 | $19.12 | $46K | Direct | Feb 5, 2010 (1d) |
| Jan 8, 2010 | VOLC | ↓ Sell | 35,000 | $18.55 | $649K | Direct | Jan 11, 2010 (3d) |
| Nov 14, 2008 | VOLC | ↓ Sell | 4,015 | $18.00 | $72K | Direct | Nov 18, 2008 (4d) |
| Sep 8, 2008 | VOLC | ↓ Sell | 29,346 | $18.44 | $541K | Direct | Sep 10, 2008 (2d) |
| Sep 8, 2008 | VOLC | ↓ Sell | 5,654 | $18.22 | $103K | Direct | Sep 10, 2008 (2d) |
| Aug 8, 2007 | VOLC | ↓ Sell | 7,000 | $18.00 | $126K | Direct | Aug 9, 2007 (1d) |
| Jul 9, 2007 | VOLC | ↓ Sell | 7,000 | $20.39 | $143K | Direct | Jul 10, 2007 (1d) |
| Dec 12, 2006 | VOLC | ↓ Sell | 35,000 | $16.75 | $586K | Direct | Dec 13, 2006 (1d) |
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 John F Sheridan's insider trades
John F Sheridan is President & CEO at Tandem Diabetes Care (TNDM). Since Dec 12, 2006, John has reported 2 open-market purchases worth $277K and 39 sales worth $17.5M on SEC Form 4. There have been no open-market trades in the last 12 months.
21 sales (15% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include option exercises (70 filings), grants and awards (35 filings), shares withheld for taxes (32 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.