Summary
Updated Aug 30, 2026
Mark H. Collin files SEC Form 4 reports at UNITIL CORP (UTL). 2 SEC Form 4 filings on record going back to 2024, most recently on 1 October 2025.
Recent Transactions
2Every recent SEC Form 4 transaction Mark H. Collin has reported, most recent first.
Other Insiders Active in the Same Sector
No other insider has filed at Mark H. Collin's companies, so these are insiders reporting open-market trades at other companies in the same sector.
- Zach Davis - $8.70M of LNG open-market activity in the last 12 months
- James C. Fish Jr. - $8.47M of WM open-market activity in the last 12 months
- Virginia Kinney - $8.18M of NRG open-market activity in the last 12 months
- Ronald J. Mittelstaedt - $7.61M of WCN open-market activity in the last 12 months
- Patrick J. McDonie - $7.55M of TRGP open-market activity in the last 12 months
- D. Scott Pryor - $7.45M of TRGP 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 Mark H. Collin?
Mark H. Collin is a corporate insider of UNITIL CORP (UTL). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Mark H. Collin last file a Form 4?
The most recent primary Form 4 on record is dated 1 October 2025, one of 2 filings going back to 2024.
Where can I see all of Mark H. Collin'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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