Insider · CIK 0001726322
Leigh Vosseller
Files at TNDM (TANDEM DIABETES CARE INC). First filing Nov 13, 2023, latest Aug 11, 2025.
In brief
Leigh Vosseller files SEC Form 4 as CFO at TNDM (TANDEM DIABETES CARE INC). Since Nov 13, 2023, Leigh Vosseller has reported 2 open-market buys worth $245k and 0 open-market sells worth $0, the latest filed on Aug 11, 2025.
A track record needs three past buys with six months of prices behind them; Leigh Vosseller has 1, so none is measured yet.
The newest scored trade: bought $149k of TNDM on Aug 8, 2025, filed Aug 11, 2025, scored 69 (notable).
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
TNDM: TANDEM DIABETES CARE INC
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 69Notable | TANDEM DIABETES CARE INC | $149k 13,720 shares | +116% | 0% from low-75% from high | |
| 68Notable | TANDEM DIABETES CARE INC | $95k 6,200 shares | +110% | +2% from low-67% from high |
Transactions
The newest 50 of 71 rows this insider has filed.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,496 | $0.00 | $0 | 50,895 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -537 | $22.72 | $12k | 50,358 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +2,624 | $0.00 | $0 | 52,982 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -942 | $22.72 | $21k | 52,040 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,496 | $0.00 | $0 | 4,486 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -2,624 | $0.00 | $0 | 18,368 | Aug 18, 2026 |
| May 29, 2026 | TNDM TANDEM DIABETES CARE INC | AGrant or award Restricted Stock Unitderivative | +62,657 | $0.00 | $0 | 62,657 | Jun 2, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,503 | $0.00 | $0 | 40,914 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -540 | $12.82 | $6,923 | 40,374 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,496 | $0.00 | $0 | 41,870 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -537 | $12.82 | $6,884 | 41,333 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +10,496 | $0.00 | $0 | 51,829 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -3,766 | $12.82 | $48k | 48,063 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | AGrant or award Common Stock | +1,336 | $10.90 | $15k | 49,399 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,503 | $0.00 | $0 | 0 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,496 | $0.00 | $0 | 5,982 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -10,496 | $0.00 | $0 | 20,992 | May 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,503 | $0.00 | $0 | 39,151 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -619 | $18.95 | $12k | 38,532 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,495 | $0.00 | $0 | 40,027 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -616 | $18.95 | $12k | 39,411 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,503 | $0.00 | $0 | 1,503 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,495 | $0.00 | $0 | 7,478 | Feb 19, 2026 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,503 | $0.00 | $0 | 37,226 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -538 | $18.61 | $10k | 36,688 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,496 | $0.00 | $0 | 38,184 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -536 | $18.61 | $9,975 | 37,648 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,503 | $0.00 | $0 | 3,006 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,496 | $0.00 | $0 | 8,973 | Nov 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,503 | $0.00 | $0 | 35,301 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -538 | $10.82 | $5,821 | 34,763 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,495 | $0.00 | $0 | 36,258 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -535 | $10.82 | $5,789 | 35,723 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,503 | $0.00 | $0 | 4,509 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,495 | $0.00 | $0 | 10,469 | Aug 19, 2025 |
| Aug 8, 2025 | TNDM TANDEM DIABETES CARE INC | POpen-market purchase Common Stockindirect: Leigh A. Vosseller Trust | +13,720 | $10.89 | $149k | 25,580 | Aug 11, 2025 |
| May 30, 2025 | TNDM TANDEM DIABETES CARE INC | AGrant or award Performance Stock Unitderivative | +31,486 | $0.00 | $0 | 31,486 | Jun 5, 2025 |
| May 30, 2025 | TNDM TANDEM DIABETES CARE INC | AGrant or award Restricted Stock Unitderivative | +31,488 | $0.00 | $0 | 31,488 | Jun 5, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | AGrant or award Common Stock | +1,359 | $15.64 | $21k | 28,584 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +162 | $0.00 | $0 | 28,746 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -58 | $22.70 | $1,317 | 28,688 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +474 | $0.00 | $0 | 29,162 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -170 | $22.70 | $3,859 | 28,992 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +1,503 | $0.00 | $0 | 30,495 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -538 | $22.70 | $12k | 29,957 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,982 | $0.00 | $0 | 35,939 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -2,141 | $22.70 | $49k | 33,798 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -162 | $0.00 | $0 | 0 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -474 | $0.00 | $0 | 0 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -1,503 | $0.00 | $0 | 6,012 | May 19, 2025 |
Questions about Leigh Vosseller
Answered from the filings on this page, as of the latest one.
Is Leigh Vosseller buying or selling?
Not in the last 12 months. Leigh Vosseller's latest open-market trade on SEC Form 4 was bought $149k of TNDM on Aug 8, 2025.
How did Leigh Vosseller's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Leigh Vosseller has 1.
Where does Leigh Vosseller file Form 4?
Leigh Vosseller has filed Form 4 at TNDM (TANDEM DIABETES CARE INC) as EVP & CHIEF FINANCIAL OFFICER. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.