Summary
Updated Aug 31, 2026
Leonard L. Mazur is Chief Executive Officer, Director of CITIUS ONCOLOGY, INC. (CTOR). 6 SEC Form 4 filings on record going back to 2024, most recently on 22 December 2025.
Recent Transactions
3Every recent SEC Form 4 transaction Leonard L. Mazur has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Leonard L. Mazur go back to 2024: 6 primary Form 4 filings, an average of 2.0 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 Leonard L. Mazur's companies, so these are insiders reporting open-market trades at other companies in the same sector.
- Jesse J. Geiger - $41.11M of MEDP open-market activity in the last 12 months
- RA CAPITAL MANAGEMENT, L.P. - $40.00M of BCAX open-market activity in the last 12 months
- Sanj K. Patel - $39.43M of KNSA open-market activity in the last 12 months
- Matrix Capital Management Company, LP - $39.04M of AURA open-market activity in the last 12 months
- Dirk Kersten - $38.57M of DYN open-market activity in the last 12 months
- Ari Bousbib - $38.55M of IQV 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 Leonard L. Mazur?
Leonard L. Mazur is a corporate insider, tracked as Chief Executive Officer, Director of CITIUS ONCOLOGY, INC. (CTOR). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Leonard L. Mazur last file a Form 4?
The most recent primary Form 4 on record is dated 22 December 2025, one of 6 filings going back to 2024.
Where can I see all of Leonard L. Mazur'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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