| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
President & CEO | EVP, Chief Operating Officer | EVP & Chief Operating Officer
1 company
John F Sheridan is President & CEO at TNDM. John F Sheridan's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $2.8M at current prices.
Our model assigns John F Sheridan a middling insider score of 55/100, based on 4 past trades. Over a 12-month horizon, 75.0% of those trades were profitable, with an average 12-month return of +35.4%.
The TNDM filings lean toward selling, a net 192,414 shares.
John F Sheridan has 66 Form 4 filings on record from November 2015 to August 2026, all as President & CEO at Tandem Diabetes Care (TNDM), 2015–2026.
The 198 reported transactions were 79 option exercises, 54 tax withholdings, 29 open-market sales and 22 option or other derivative awards, plus smaller numbers of other types.
Counted by filing, the open-market trades come to 2 purchases worth about $277K and 17 sales worth about $14.4M.
The largest open-market purchase was 2,500 shares of TNDM at an average $69.90 on May 9, 2022, about $175K. Twelve months later TNDM was down 53%.
The largest open-market sale was 33,200 shares of TNDM at an average $102.21 on August 3, 2020, about $3.4M.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 11, 2025 | TNDM Tandem Diabetes Care Inc | President & CEO | Buy | 10,000 | $10.23 | $102,318.00 | +10.4% | +61.8% | +131.7% | |
| May 9, 2022 | TNDM Tandem Diabetes Care Inc | President & CEO | Buy | 2,500 | $69.90 | $174,750.00 | +33.1% | -13.5% | -52.9% | |
| Aug 9, 2021 | TNDM Tandem Diabetes Care Inc | President & CEO | Sale+OE | 14,926 | $108.04 | $1,612,575.76 | -70.7% | +26.0% | -50.0% | |
| Oct 13, 2020 | TNDM Tandem Diabetes Care Inc | President & CEO | Sale+OE | 15,000 | $121.31 | $1,819,657.82 | -80.0% | - | - | |
| Sep 16, 2020 | TNDM Tandem Diabetes Care Inc | President & CEO | Sale+OE | 10,000 | $110.02 | $1,100,180.05 | -72.7% | - | - | |
| Aug 3, 2020 | TNDM Tandem Diabetes Care Inc | President & CEO | Sale+OE | 33,200 | $102.21 | $3,393,231.23 | -89.8% | - | - | |
| Feb 21, 2020 | TNDM Tandem Diabetes Care Inc | President & CEO | Sale+OE | 30,000 | $87.86 | $2,635,886.87 | -92.3% | - | - | |
| Nov 25, 2019 | TNDM Tandem Diabetes Care Inc | President & CEO | Sale+OE | 462 | $70.00 | $32,340.00 | -15.6% | - | - | |
| Sep 6, 2019 | TNDM Tandem Diabetes Care Inc | President & CEO | Sale+OE | 9,538 | $70.03 | $667,946.14 | -79.2% | - | - | |
| Feb 27, 2019 | TNDM Tandem Diabetes Care Inc | EVP, Chief Operating Officer | Sale+OE | 20,000 | $62.03 | $1,240,556.00 | -96.8% | - | - |