Summary
Updated Aug 31, 2026
Mary Michele T. St. is Chief Legal Officer & GC of Amentum Holdings, Inc. (AMTM). 2 SEC Form 4 filings on record going back to 2025, most recently on 18 February 2026.
Recent Transactions
3Every recent SEC Form 4 transaction Mary Michele T. St. has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Mary Michele T. St. go back to 2025: 2 primary Form 4 filings, an average of 1.0 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 Sector
No other insider has filed at Mary Michele T. St.'s companies, so these are insiders reporting open-market trades at other companies in the same sector.
- CANADA PENSION PLAN INVESTMENT BOARD - $232.86M of WAY open-market activity in the last 12 months
- Richard Adam Norwitt - $219.27M of APH open-market activity in the last 12 months
- SUMMIT PARTNERS L P - $216.03M of KVYO open-market activity in the last 12 months
- AES CORP - $211.39M of FLNC open-market activity in the last 12 months
- SPT Holding Sarl - $206.64M of FLNC open-market activity in the last 12 months
- Peter A. Feld - $192.29M of QRVO 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 Mary Michele T. St.?
Mary Michele T. St. is a corporate insider, tracked as Chief Legal Officer & GC of Amentum Holdings, Inc. (AMTM). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Mary Michele T. St. last file a Form 4?
The most recent primary Form 4 on record is dated 18 February 2026, one of 2 filings going back to 2025.
Where can I see all of Mary Michele T. St.'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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