Insider · CIK 0001708144
Thomas J. Gunderson
Files at MMSI (MERIT MEDICAL SYSTEMS INC), TMDX (TransMedics Group, Inc.). First filing Jun 17, 2026, latest Jun 17, 2026.
Thomas J. Gunderson files SEC Form 4 as director at TMDX (TransMedics Group, Inc.), and also at MMSI (MERIT MEDICAL SYSTEMS INC). Since Jun 17, 2026, Thomas J. Gunderson has reported 0 open-market buys worth $0 and 1 open-market sell worth $722k, the latest filed on Jun 17, 2026.
A track record needs three past buys with six months of prices behind them; Thomas J. Gunderson has 0, so none is measured yet.
The newest scored trade: sold $722k of TMDX on Jun 15, 2026, filed Jun 17, 2026, scored 31 (weak). In the last 12 months: 0 buys worth $0 and 1 sell worth $722k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
TMDX: TransMedics Group, 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 |
|---|---|---|---|---|---|
| 31Weak | TMDXsell TransMedics Group, Inc. | $722k 9,624 shares | -37% | +22% from low-50% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Feb 28, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | 12,806 0.02% of outstanding | $1.3M | Feb 28, 2025 | none |
Transactions
Every row this insider has filed, 14 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jun 15, 2026 | TMDX TransMedics Group, Inc. | MOption exercise Common Stock | +19,285 | $2.21 | $43k | 26,266 | Jun 17, 2026 |
| Jun 15, 2026 | TMDX TransMedics Group, Inc. | SOpen-market sale Common Stock | -9,624 | $75.06 | $722k | 16,642 | Jun 17, 2026 |
| Jun 15, 2026 | TMDX TransMedics Group, Inc. | MOption exercise Stock Option (Right to Buy)derivative | -19,285 | $0.00 | $0 | 0 | Jun 17, 2026 |
| May 20, 2026 | TMDX TransMedics Group, Inc. | AGrant or award Common Stock | +2,922 | $0.00 | $0 | 6,981 | May 22, 2026 |
| May 20, 2026 | MMSI MERIT MEDICAL SYSTEMS INC | MOption exercise Common Stock, No Par Value | +13,750 | $52.17 | $717k | 53,241 | May 21, 2026 |
| May 20, 2026 | MMSI MERIT MEDICAL SYSTEMS INC | MOption exercise Common Stock, No Par Value | +7,500 | $52.17 | $391k | 60,741 | May 21, 2026 |
| May 20, 2026 | MMSI MERIT MEDICAL SYSTEMS INC | MOption exercise Non-qualified stock options (right to buy)derivative | -13,750 | $0.00 | $0 | 0 | May 21, 2026 |
| May 20, 2026 | MMSI MERIT MEDICAL SYSTEMS INC | MOption exercise Non-qualified stock options (right to buy)derivative | -7,500 | $0.00 | $0 | 0 | May 21, 2026 |
| May 18, 2026 | MMSI MERIT MEDICAL SYSTEMS INC | AGrant or award Common Stock, No Par Value | +3,457 | $0.00 | $0 | 39,491 | May 19, 2026 |
| May 22, 2025 | TMDX TransMedics Group, Inc. | AGrant or award Common Stock | +2,134 | $0.00 | $0 | 4,059 | May 23, 2025 |
| May 15, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | AGrant or award Common Stock, No Par Value | +2,152 | $0.00 | $0 | 36,034 | May 19, 2025 |
| Feb 28, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | MOption exercise Common Stock, No Par Value | +25,000 | $50.50 | $1.3M | 46,688 | Mar 3, 2025 |
| Feb 28, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | FTax withholding Common Stock, No Par Value | -12,806 | $99.95 | $1.3M | 33,882 | Mar 3, 2025 |
| Feb 28, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | MOption exercise Non-qualified stock options (right to buy)derivative | -25,000 | $0.00 | $0 | 0 | Mar 3, 2025 |
Questions about Thomas J. Gunderson
Answered from the filings on this page, as of the latest one.
Is Thomas J. Gunderson buying or selling?
In the last 12 months Thomas J. Gunderson reported 0 open-market buys worth $0 and 1 open-market sell worth $722k on SEC Form 4; the latest was sold $722k of TMDX on Jun 15, 2026. Grants, option exercises and tax withholding are not counted.
How did Thomas J. Gunderson's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Thomas J. Gunderson has 0.
Where does Thomas J. Gunderson file Form 4?
Thomas J. Gunderson has filed Form 4 at TMDX (TransMedics Group, Inc.); MMSI (MERIT MEDICAL SYSTEMS INC). 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.