Michael Martin Breen - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Michael Martin Breen is a corporate insider tracked by InsiderAlpha. No SEC Form 4 filings recorded in the last 90 days.
Profile
Michael Martin Breen holds the role of CEO and Director at GT Biopharma, Inc. (GTBP). Breen has reported 1 insider filing with the SEC since 2025. The most recent filing was in September 2025.
| Role | CEO and Director, Director |
|---|---|
| Notability | 40/100 |
Board memberships
- GT Biopharma, Inc.
Reported roles
- CEO and Director
Awards & honors
- Leadership in GT Biopharma
- Development of immuno-oncology products
Trading Pattern
InsiderAlpha's records for Michael Martin Breen go back to 2025: 1 primary Form 4 filing, an average of 0.5 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.
Career & Filing History
Every role Michael Martin Breen has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- CEO and Director, Director at GT Biopharma, Inc. (GTBP) - 1 filing, 2025
Most Active Insiders Right Now
Michael Martin Breen has no recent co-filers at the same companies, so here are the insiders with the largest open-market activity across the market in the last 90 days.
- MetLife Investment Management, LLC - $1600000.00B of FINS open-market activity in the last 90 days
- Magnetar Financial LLC - $16357.48B of CRWV open-market activity in the last 90 days
- Marianne Okland - $18.46B of STNG open-market activity in the last 90 days
- VisionWave Holdings, Inc. - $14.13B of SVRE open-market activity in the last 90 days
- Vanessa Allen Sutherland - $7.44B of PSX open-market activity in the last 90 days
- AI Alpine (Luxembourg) S.a.r.l. - $2.69B of INIO open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Andrew J. Mills
- Charles N. Mills
- Kevin J. Mills
- Mink Brook Asset Management LLC
- Shankh Mitra
- MITSUI SUMITOMO INSURANCE CO LTD
- Arturo R. Moreno
- Matthew T. Moroun
Frequently Asked Questions
Who is Michael Martin Breen?
Michael Martin Breen holds the role of CEO and Director at GT Biopharma, Inc. (GTBP). Breen has reported 1 insider filing with the SEC since 2025. The most recent filing was in September 2025.…
Where can I see all of Michael Martin Breen'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
Open the live Michael Martin Breen profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.