Summary
Updated Aug 31, 2026
Anthony O'Sullivan is Chief Development Officer of TMC the metals Co Inc. (TMC). 3 SEC Form 4 filings on record, most recently on 2 December 2025. Most recent open-market trade: sold $338K of TMC on 2 December 2025. Lifetime open-market sales: $3.98M.
Recent Transactions
8Every recent SEC Form 4 transaction Anthony O'Sullivan has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Anthony O'Sullivan go back to 2025: 3 primary Form 4 filings, an average of 1.5 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 Anthony O'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.
- Erika Ilves - $9.18M of TMC open-market activity in the last 12 months
- Craig Shesky - $1.58M of TMC open-market activity in the last 12 months
- Brendan May - $133K of TMC open-market activity in the last 12 months
- Allseas Group S.A. - of TMC 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 Anthony O'Sullivan?
Anthony O'Sullivan is a corporate insider, tracked as Chief Development Officer of TMC the metals Co Inc. (TMC). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Anthony O'Sullivan last file a Form 4?
The most recent primary Form 4 on record is dated 2 December 2025, one of 3 filings going back to 2025.
Has Anthony O'Sullivan been buying or selling stock?
Recorded transactions: 0 open-market purchases and 6 open-market sales ($3.98M) across all tracked filings.
Where can I see all of Anthony O'Sullivan'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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