Based on data from the past 90 days ending January 02, 2026, Citius Oncology's three largest insider shareholders are Chief Executive Officer Leonard L Mazur (1.70Mn shares), Secretary Myron Z Holubiak (950.00K shares), Chief Financial Officer Jaime Bartushak (825.00K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Leonard L Mazur | Chief Executive Officer | 1,700,000 | 01 Dec, 2025 |
| Myron Z Holubiak | Secretary | 950,000 | 01 Dec, 2025 |
| Jaime Bartushak | Chief Financial Officer | 825,000 | 01 Dec, 2025 |
| Myron Czuczman | Chief Medical Officer | 825,000 | 01 Dec, 2025 |
| Joel David Mayersohn | 321,228 | 01 Dec, 2025 | |
| Robert Joseph Smith | 300,000 | 01 Dec, 2025 | |
| Dennis M Mcgrath | 300,000 | 01 Dec, 2025 | |
| Suren G Dutia | 300,000 | 01 Dec, 2025 | |
| Carol Webb | 300,000 | 01 Dec, 2025 | |
| Eugene Myron Holuka | 300,000 | 01 Dec, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 19 Sep, 2025 | Eugene Myron Holuka | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Joel David Mayersohn | Common Stock | A | 300,000 | $0.00 | 321,228 | D | A |
| 19 Sep, 2025 | Jaime Bartushak | Common Stock | A | 825,000 | $0.00 | 825,000 | D | A |
| 19 Sep, 2025 | Eugene Myron Holuka | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Myron Czuczman | Common Stock | A | 825,000 | $0.00 | 825,000 | D | A |
| 19 Sep, 2025 | Dennis M Mcgrath | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Carol Webb | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Leonard L Mazur | Common Stock | A | 1,700,000 | $0.00 | 1,700,000 | D | A |
| 19 Sep, 2025 | Robert Joseph Smith | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Suren G Dutia | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Joel David Mayersohn | Common Stock | A | 300,000 | $0.00 | 321,228 | D | A |
| 19 Sep, 2025 | Carol Webb | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Myron Z Holubiak | Common Stock | A | 850,000 | $0.00 | 850,000 | D | A |
| 19 Sep, 2025 | Myron Czuczman | Common Stock | A | 825,000 | $0.00 | 825,000 | D | A |
| 19 Sep, 2025 | Suren G Dutia | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Leonard L Mazur | Common Stock | A | 1,700,000 | $0.00 | 1,700,000 | D | A |
| 19 Sep, 2025 | Robert Joseph Smith | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |
| 19 Sep, 2025 | Jaime Bartushak | Common Stock | A | 825,000 | $0.00 | 825,000 | D | A |
| 19 Sep, 2025 | Myron Z Holubiak | Common Stock | A | 850,000 | $0.00 | 850,000 | D | A |
| 19 Sep, 2025 | Dennis M Mcgrath | Common Stock | A | 300,000 | $0.00 | 300,000 | D | A |