| 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 |
|---|---|---|---|---|---|---|---|---|---|
EVP & Chief Financial Officer | EVP and CFO
1 company
Leigh Vosseller is EVP & Chief Financial Officer at TNDM. Leigh Vosseller'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 $919K at current prices.
Historically, Leigh Vosseller's trades have earned a strong insider score of 76/100 across 11 rated trades. Over a 12-month horizon, 81.8% of those trades were profitable, with an average 12-month return of +43.8%.
The TNDM filings lean toward selling, a net 144,565 shares.
Leigh Vosseller has 60 Form 4 filings on record from June 2018 to August 2026, all as EVP & Chief Financial Officer at Tandem Diabetes Care (TNDM), 2018–2026.
The 188 reported transactions were 75 option exercises, 54 tax withholdings, 26 open-market sales and 17 option or other derivative awards, plus smaller numbers of other types.
Counted by filing, the open-market trades come to 4 purchases worth about $530K and 15 sales worth about $17.0M.
The largest open-market purchase was 2,500 shares of TNDM at an average $74.61 on May 9, 2022, about $187K. Twelve months later TNDM was down 53%.
The largest open-market sale was 20,000 shares of TNDM at an average $132.55 on October 14, 2021, about $2.7M. Twelve months later TNDM was down 62%.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 8, 2025 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Buy | 13,720 | $10.89 | $149,403.94 | +115.7% | +18.7% | +99.3% | |
| Nov 8, 2023 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Buy | 6,200 | $15.39 | $95,395.06 | +109.5% | +55.7% | +114.7% | |
| May 12, 2023 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Buy | 3,015 | $32.77 | $98,805.47 | +114.0% | -11.1% | +34.6% | |
| May 9, 2022 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Buy | 2,500 | $74.61 | $186,527.60 | +37.8% | -13.5% | -52.9% | |
| Nov 3, 2021 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Sale+OE | 10,000 | $140.05 | $1,400,505.00 | -61.9% | -15.1% | -74.0% | |
| Oct 14, 2021 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Sale+OE | 20,000 | $132.55 | $2,650,905.00 | -76.5% | -4.3% | -61.9% | |
| Sep 16, 2021 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Sale+OE | 10,000 | $125.00 | $1,250,000.00 | -61.9% | +17.3% | -53.5% | |
| Sep 13, 2021 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Sale+OE | 10,000 | $120.75 | $1,207,512.00 | -61.9% | +10.7% | -52.6% | |
| Oct 13, 2020 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Sale+OE | 10,000 | $120.87 | $1,208,728.26 | -68.9% | - | - | |
| Jul 31, 2020 | TNDM Tandem Diabetes Care Inc | EVP & Chief Financial Officer | Sale+OE | 10,000 | $110.03 | $1,100,319.00 | -68.9% | - | - |