Summary
Updated Aug 31, 2026
Daniel Karlin is Chief Medical Officer of Definium Therapeutics, Inc. (DFTX). 8 SEC Form 4 filings on record going back to 2024, most recently on 12 August 2026. Most recent open-market trade: sold $452K of DFTX on 26 June 2026. Lifetime open-market sales: $798K.
Recent Transactions
8Every recent SEC Form 4 transaction Daniel Karlin has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Daniel Karlin go back to 2024: 8 primary Form 4 filings, an average of 2.7 per year. 4 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Daniel Karlin 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 - $2.36M of DFTX open-market activity in the last 12 months
- Mark Sullivan - $1.04M of DFTX open-market activity in the last 12 months
- Brandi Roberts - $136K of DFTX open-market activity in the last 12 months
- Matthew T. Wiley - $129K of DFTX open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Daniel Karlin?
Daniel Karlin is a corporate insider, tracked as Chief Medical Officer of Definium Therapeutics, Inc. (DFTX). InsiderAlpha holds 8 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 Daniel Karlin submitted recently?
3 primary Form 4 filings in the last 90 days, covering 1 company.
Has Daniel Karlin been buying or selling stock?
Recorded transactions: 0 open-market purchases and 5 open-market sales ($798K) across all tracked filings.
Where can I see all of Daniel Karlin's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Follow Daniel Karlin and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial