Gunderson Thomas J.
SEC insider (Form 3/4/5 filer). CIK 0001708144. Director at TransMedics Group, Inc. (TMDX) and 1 other issuer. 10 reported Form 4/5 transactions since Sep 2024; latest on Jun 15, 2026. Located in ANDOVER, MA.
Companies Gunderson Thomas J. has filed insider reports for
- TransMedics Group, Inc. (TMDX): Director
- MERIT MEDICAL SYSTEMS INC (MMSI): Director
Gunderson Thomas J.
CIK: 0001708144
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (10 total)
- Jun 15, 2026TMDX
TransMedics Group, Inc.
SaleDirect9.6K shares at avg. $75.06$722K - Jun 15, 2026TMDX
TransMedics Group, Inc.
ExerciseDirect19.3K shares at avg. $2.21$43K - May 20, 2026TMDX
TransMedics Group, Inc.
AwardDirect2.9K shares- - May 20, 2026MMSI
MERIT MEDICAL SYSTEMS INC
ExerciseDirect13.8K shares at avg. $52.17$717K - May 20, 2026MMSI
MERIT MEDICAL SYSTEMS INC
ExerciseDirect7.5K shares at avg. $52.17$391K - May 18, 2026MMSI
MERIT MEDICAL SYSTEMS INC
AwardDirect3.5K shares- - May 22, 2025TMDX
TransMedics Group, Inc.
AwardDirect2.1K shares- - May 15, 2025MMSI
MERIT MEDICAL SYSTEMS INC
AwardDirect2.2K shares- - Feb 28, 2025MMSI
MERIT MEDICAL SYSTEMS INC
Tax PaymentDirect12.8K shares at avg. $99.95$1.3M - Feb 28, 2025MMSI
MERIT MEDICAL SYSTEMS INC
ExerciseDirect25K shares at avg. $50.50$1.3M
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Jun 15, 2026 |  TMDX TransMedics Group, Inc. | Sale | 9,624 | $75.06 | $722,377 | Direct |
| Jun 15, 2026 | TMDX TransMedics Group, Inc. | Exercise | 19,285 | $2.21 | $42,620 | Direct |
| May 20, 2026 | TMDX TransMedics Group, Inc. | Award | 2,922 | - | $0 | Direct |
| May 20, 2026 |  MMSI MERIT MEDICAL SYSTEMS INC | Exercise | 13,750 | $52.17 | $717,338 | Direct |
| May 20, 2026 | MMSI MERIT MEDICAL SYSTEMS INC | Exercise | 7,500 | $52.17 | $391,275 | Direct |
| May 18, 2026 | MMSI MERIT MEDICAL SYSTEMS INC | Award | 3,457 | - | $0 | Direct |
| May 22, 2025 | TMDX TransMedics Group, Inc. | Award | 2,134 | - | - | Direct |
| May 15, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | Award | 2,152 | - | - | Direct |
| Feb 28, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | Tax Payment | 12,806 | $99.95 | $1,279,960 | Direct |
| Feb 28, 2025 | MMSI MERIT MEDICAL SYSTEMS INC | Exercise | 25,000 | $50.50 | $1,262,500 | Direct |
1-10 of 10 transactions