Insider · CIK 0001365369
John F Sheridan
Files at TNDM (TANDEM DIABETES CARE INC). First filing Aug 11, 2025, latest Aug 11, 2025.
In brief
John F Sheridan files SEC Form 4 as CEO, president and director at TNDM (TANDEM DIABETES CARE INC). Since Aug 11, 2025, John F Sheridan has reported 1 open-market buy worth $102k 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; John F Sheridan has 0, so none is measured yet.
The newest scored trade: bought $102k of TNDM on Aug 11, 2025, filed Aug 11, 2025, scored 64 (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 |
|---|---|---|---|---|---|
| 64Notable | TANDEM DIABETES CARE INC | $102k 10,000 shares | +10% | 0% from low-78% from high |
Transactions
The newest 50 of 95 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 | +5,982 | $0.00 | $0 | 158,425 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -3,044 | $22.72 | $69k | 155,381 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +9,934 | $0.00 | $0 | 165,315 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -5,055 | $22.72 | $115k | 160,260 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,982 | $0.00 | $0 | 17,947 | Aug 18, 2026 |
| Aug 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -9,934 | $0.00 | $0 | 69,537 | Aug 18, 2026 |
| May 29, 2026 | TNDM TANDEM DIABETES CARE INC | AGrant or award Restricted Stock Unitderivative | +191,103 | $0.00 | $0 | 191,103 | Jun 2, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,472 | $0.00 | $0 | 130,163 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -2,785 | $12.82 | $36k | 127,378 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,982 | $0.00 | $0 | 133,360 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -3,044 | $12.82 | $39k | 130,316 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +39,735 | $0.00 | $0 | 170,051 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -18,944 | $12.82 | $243k | 151,107 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | AGrant or award Common Stock | +1,336 | $10.90 | $15k | 152,443 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,472 | $0.00 | $0 | 0 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,982 | $0.00 | $0 | 23,929 | May 19, 2026 |
| May 15, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -39,735 | $0.00 | $0 | 79,471 | May 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,471 | $0.00 | $0 | 123,071 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -1,963 | $18.95 | $37k | 121,108 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,983 | $0.00 | $0 | 127,091 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -2,400 | $18.95 | $45k | 124,691 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,471 | $0.00 | $0 | 5,472 | Feb 19, 2026 |
| Feb 17, 2026 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,983 | $0.00 | $0 | 29,911 | Feb 19, 2026 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,472 | $0.00 | $0 | 117,435 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -2,779 | $18.61 | $52k | 114,656 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,982 | $0.00 | $0 | 120,638 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -3,038 | $18.61 | $57k | 117,600 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,472 | $0.00 | $0 | 10,943 | Nov 19, 2025 |
| Nov 17, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,982 | $0.00 | $0 | 35,894 | Nov 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,471 | $0.00 | $0 | 111,798 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -2,779 | $10.82 | $30k | 109,019 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,982 | $0.00 | $0 | 115,001 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -3,038 | $10.82 | $33k | 111,963 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,471 | $0.00 | $0 | 16,415 | Aug 19, 2025 |
| Aug 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,982 | $0.00 | $0 | 41,876 | Aug 19, 2025 |
| Aug 11, 2025 | TNDM TANDEM DIABETES CARE INC | POpen-market purchase Common Stock | +10,000 | $10.23 | $102k | 106,327 | Aug 11, 2025 |
| May 30, 2025 | TNDM TANDEM DIABETES CARE INC | AGrant or award Performance Stock Unitderivative | +119,204 | $0.00 | $0 | 119,204 | Jun 5, 2025 |
| May 30, 2025 | TNDM TANDEM DIABETES CARE INC | AGrant or award Restricted Stock Unitderivative | +119,206 | $0.00 | $0 | 119,206 | Jun 5, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | AGrant or award Common Stock | +1,359 | $15.64 | $21k | 80,368 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +792 | $0.00 | $0 | 81,160 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -403 | $22.70 | $9,148 | 80,757 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +2,236 | $0.00 | $0 | 82,993 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -1,136 | $22.70 | $26k | 81,857 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +5,472 | $22.70 | $124k | 87,329 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -2,779 | $22.70 | $63k | 84,550 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Common Stock | +23,929 | $0.00 | $0 | 108,479 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | FTax withholding Common Stock | -12,152 | $22.70 | $276k | 96,327 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -792 | $0.00 | $0 | 0 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -2,236 | $0.00 | $0 | 0 | May 19, 2025 |
| May 15, 2025 | TNDM TANDEM DIABETES CARE INC | MOption exercise Restricted Stock Unitderivative | -5,472 | $0.00 | $0 | 21,886 | May 19, 2025 |
Questions about John F Sheridan
Answered from the filings on this page, as of the latest one.
Is John F Sheridan buying or selling?
Not in the last 12 months. John F Sheridan's latest open-market trade on SEC Form 4 was bought $102k of TNDM on Aug 11, 2025.
How did John F Sheridan's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and John F Sheridan has 0.
Where does John F Sheridan file Form 4?
John F Sheridan has filed Form 4 at TNDM (TANDEM DIABETES CARE INC) as PRESIDENT & CEO. 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.