Mark Sullivan
Chief Legal Officer · Definium Therapeutics, Inc.
- 2024
- Sep 30, 2026
- 10
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies Mark Sullivan files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Robert Barrow - $3.98M in DFTX purchases and sales in the last 12 months
- Daniel Karlin - $1.07M in DFTX purchases and sales in the last 12 months
- Brandi Roberts - $259K in DFTX purchases and sales in the last 12 months
- Matthew T. Wiley - $242K in DFTX purchases and sales in the last 12 months
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Frequently asked questions
Who is Mark Sullivan?
Mark Sullivan is a corporate insider, tracked as Chief Legal Officer of Definium Therapeutics, Inc. (DFTX). InsiderAlpha holds 10 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Mark Sullivan submitted recently?
3 primary Form 4 filings in the last 90 days, covering 1 company.
Has Mark Sullivan been buying or selling stock?
Recorded transactions: 0 open-market purchases and 6 open-market sales ($1.59M) across all tracked filings.
