Mark Sullivan
CIK: 0001331843
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Companies & Roles (1)
Definium Therapeutics, Inc.
Discretionary Trading P&L
Holdings
Transaction History (14 total)
- Sep 25, 2026DFTX
Definium Therapeutics, Inc.
Sale(S)Direct14.1K shares at avg. $36.57$514K - Sep 14, 2026DFTX
Definium Therapeutics, Inc.
Award(A)Direct125K shares- - Aug 12, 2026DFTX
Definium Therapeutics, Inc.
Award(A)Direct62.5K shares- - Jun 25, 2026DFTX
Definium Therapeutics, Inc.
Sale(S)Direct13K shares at avg. $45.03$586K - Jun 22, 2026DFTX
Definium Therapeutics, Inc.
Award(A)Direct62.5K shares- - Mar 25, 2026DFTX
Definium Therapeutics, Inc.
Sale(S)Direct10.7K shares at avg. $18.47$198K - Feb 3, 2026DFTX
Definium Therapeutics, Inc.
Award(A)Direct125K shares- - Dec 26, 2025MNMD
Mind Medicine (MindMed) Inc.
Sale(S)Direct11.3K shares at avg. $13.15$148K - Sep 25, 2025MNMD
Mind Medicine (MindMed) Inc.
Sale(S)Direct11.3K shares at avg. $9.77$110K - Jun 25, 2025MNMD
Mind Medicine (MindMed) Inc.
Sale(S)Direct11.5K shares at avg. $6.80$78K - Mar 25, 2025MNMD
Mind Medicine (MindMed) Inc.
Sale(S)Direct6.6K shares at avg. $6.74$44K - Mar 12, 2025MNMD
Mind Medicine (MindMed) Inc.
Award(A)Direct150K shares- - Dec 26, 2024MNMD
Mind Medicine (MindMed) Inc.
Sale(S)Direct4.5K shares at avg. $7.43$34K - Sep 25, 2024MNMD
Mind Medicine (MindMed) Inc.
Sale(S)Direct4.4K shares at avg. $5.98$26K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Sep 25, 2026 | DFTX Definium Therapeutics, Inc. | Sale(S) | 14,051 | $36.57 | $513,845 | Direct |
| Sep 14, 2026 | DFTX Definium Therapeutics, Inc. | Award(A) | 125,000 | - | $0 | Direct |
| Aug 12, 2026 | DFTX Definium Therapeutics, Inc. | Award(A) | 62,500 | - | $0 | Direct |
| Jun 25, 2026 | DFTX Definium Therapeutics, Inc. | Sale(S) | 13,008 | $45.03 | $585,750 | Direct |
| Jun 22, 2026 | DFTX Definium Therapeutics, Inc. | Award(A) | 62,500 | - | $0 | Direct |
| Mar 25, 2026 | DFTX Definium Therapeutics, Inc. | Sale(S) | 10,702 | $18.47 | $197,666 | Direct |
| Feb 3, 2026 | DFTX Definium Therapeutics, Inc. | Award(A) | 125,000 | - | $0 | Direct |
| Dec 26, 2025 |  MNMD Mind Medicine (MindMed) Inc. | Sale(S) | 11,276 | $13.15 | $148,244 | Direct |
| Sep 25, 2025 | MNMD Mind Medicine (MindMed) Inc. | Sale(S) | 11,278 | $9.77 | $110,186 | Direct |
| Jun 25, 2025 | MNMD Mind Medicine (MindMed) Inc. | Sale(S) | 11,491 | $6.80 | $78,139 | Direct |
| Mar 25, 2025 | MNMD Mind Medicine (MindMed) Inc. | Sale(S) | 6,576 | $6.74 | $44,322 | Direct |
| Mar 12, 2025 | MNMD Mind Medicine (MindMed) Inc. | Award(A) | 150,000 | - | - | Direct |
| Dec 26, 2024 | MNMD Mind Medicine (MindMed) Inc. | Sale(S) | 4,519 | $7.43 | $33,576 | Direct |
| Sep 25, 2024 | MNMD Mind Medicine (MindMed) Inc. | Sale(S) | 4,430 | $5.98 | $26,491 | Direct |
1-14 of 14 transactions
About Sullivan Mark
Sullivan Mark (SEC CIK 0001331843) files insider reports with the SEC as Chief Legal Officer of Definium Therapeutics, Inc. (DFTX).
Signal8 holds 14 ownership filings by Sullivan Mark, all Form 4s, filed between Sep 25, 2024 and Sep 29, 2026. Those filings report 14 transactions, from Sep 25, 2024 to Sep 25, 2026. Signal8's Form 4 history starts in Sep 2024.
The business address on Sullivan Mark's filings is in NEW YORK, NY.
Recent filings by Sullivan Mark
- Sep 25, 2026: Open-market sale of DFTX shares (Form 4, code S).
- Sep 14, 2026: Grant or award of DFTX shares (Form 4, code A).
- Aug 12, 2026: Grant or award of DFTX shares (Form 4, code A).
- Jun 25, 2026: Open-market sale of DFTX shares (Form 4, code S).
- Jun 22, 2026: Grant or award of DFTX shares (Form 4, code A).
Other insiders filing for Definium Therapeutics, Inc. (DFTX)
- Karlin Daniel, Chief Medical Officer
- Barrow Robert, Chief Executive Officer
- Wiley Matthew T., Chief Commercial Officer
- Roberts Brandi, Chief Financial Officer
- Vallone Carol A, Director
- Krebs Andreas, Director