Summary
Updated Aug 31, 2026
Dion J. Weisler is Director of THERMO FISHER SCIENTIFIC INC. (TMO). 9 SEC Form 4 filings on record going back to 2024, most recently on 30 June 2026.
Recent Transactions
3Every recent SEC Form 4 transaction Dion J. Weisler has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Dion J. Weisler go back to 2024: 9 primary Form 4 filings, an average of 3.0 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Dion J. Weisler 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.
- Michel Lagarde - $51.31M of TMO open-market activity in the last 12 months
- Marc N. Casper - $45.46M of TMO open-market activity in the last 12 months
- Michael D. Shafer - $22.54M of TMO open-market activity in the last 12 months
- Lisa P. Britt - $16.87M of TMO open-market activity in the last 12 months
- Frederick M. Lowery - $8.15M of TMO open-market activity in the last 12 months
- Gianluca Pettiti - $2.58M of TMO 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 Dion J. Weisler?
Dion J. Weisler is a corporate insider, tracked as Director of THERMO FISHER SCIENTIFIC INC. (TMO). InsiderAlpha holds 9 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 Dion J. Weisler submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Where can I see all of Dion J. Weisler'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.
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