Mark Sullivan
CIK 1331843 · Chief Legal Officer · last filed 2026-03-26
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$6.71M
Companies
4
Total Filings
23
Lifetime Open-Market Net
-$963.3K
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| DFTX | Chief Legal Officer | 271,079 | $24.75 | $6.71M | -$197.7K | 2 | 2026-03-26 |
| Definium Therapeutics, Inc. (MNMD) Delisted | Chief Legal Officer | 282,576 | $15.00 | $4.24M | -$569.9K | 10 | 2025-12-29 |
| Carisma Therapeutics Inc. (SESN) Delisted | General Counsel & Secretary | 383,716 | $12.58 | $4.83M | -$152.1K | 6 | 2023-03-06 |
| MModal Inc. (MEDH) Delisted | Gen Counsel, CCO & Secretary | 39,268 | — | — | -$43.7K | 5 | 2012-01-04 |
Recent Filings · Page 2 of 3
23 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-02-29 | Definium Therapeutics, Inc. (MNMD) Delisted | Grant (A) | — | $0 | EDGAR |
| 2023-04-14 | Definium Therapeutics, Inc. (MNMD) Delisted | Grant (A) | +200,000 | $0 | EDGAR |
| 2023-03-06 | Carisma Therapeutics Inc. (SESN) Delisted | Mixed | +78,957 | $46.3K | EDGAR |
| 2023-02-23 | Carisma Therapeutics Inc. (SESN) Delisted | Sell (S) | −39,831 | -$23.4K | EDGAR |
| 2022-02-23 | Carisma Therapeutics Inc. (SESN) Delisted | Grant (A) | +339,525 | $0 | EDGAR |
| 2021-02-23 | Carisma Therapeutics Inc. (SESN) Delisted | Grant (A) | — | $0 | EDGAR |
| 2020-02-18 | Carisma Therapeutics Inc. (SESN) Delisted | Grant (A) | — | $0 | EDGAR |
| 2019-08-05 | Carisma Therapeutics Inc. (SESN) Delisted | Grant (A) | — | $0 | EDGAR |
| 2012-01-04 | MModal Inc. (MEDH) Delisted | Sell (S) | −4,719 | -$43.7K | EDGAR |
| 2012-01-04 | MModal Inc. (MEDH) Delisted | Tax (F) | −1,226 | -$11.8K | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.