ALT5 Sigma's three largest insider shareholders as of April 11, 2026 are Peter Tassiopoulos (Chief Executive Officer, 420.00K shares), Antonios Isaac (Chief Executive Officer, 217.79K shares), Virland A Johnson (Cfo, 38.00K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Peter Tassiopoulos | Chief Executive Officer | 0 | 420,000 | 11 Sep, 2024 |
| Antonios Isaac | Chief Executive Officer | 217,787 | 0 | 09 Jan, 2023 |
| Virland A Johnson | Cfo | 38,000 | 0 | 12 Aug, 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 |
|---|---|---|---|---|---|---|---|---|
| 30 May, 2025 | Virland A Johnson | Common Stock | A | 25,000 | $0.01 | 38,000 | D | A |
| 30 May, 2025 | Virland A Johnson | Warrant (Right to Buy) | A | 125,000 | $0.00 | 125,000 | D | A |
| 06 Dec, 2024 | Virland A Johnson | Common Stock | A | 3,000 | $3.00 | 3,000 | D | P |
| 09 Sep, 2024 | Peter Tassiopoulos | Common Stock | A | 5,000 | $2.06 | 420,000 | I | P |
| 05 Jan, 2023 | Virland A Johnson | Common Stock | A | 78,617 | $0.00 | 78,617 | D | A |
| 05 Jan, 2023 | Antonios Isaac | Common Stock | A | 125,787 | $0.00 | 217,787 | D | A |
| 24 May, 2021 | Virland A Johnson | Common Shares | D | 32,933 | $6.70 | 0 | D | S |
| 29 Aug, 2018 | Virland A Johnson | Common Stock | A | 30,000 | $1.00 | 260,000 | D | P |
| 27 Aug, 2018 | Virland A Johnson | Common Stock | A | 15,000 | $0.78 | 230,000 | D | P |
| 24 Aug, 2018 | Virland A Johnson | Common Stock | A | 15,000 | $0.71 | 215,000 | D | P |
| 10 Aug, 2018 | Richard Butler | Common Stock | A | 50,000 | $0.00 | 90,000 | D | A |
| 10 Aug, 2018 | Virland A Johnson | Common Stock | A | 200,000 | $0.00 | 200,000 | D | A |
| 03 Oct, 2017 | Richard Butler | Common Stock | A | 20,000 | $0.00 | 30,000 | D | A |
| 23 Aug, 2017 | Bradley Bremer | Common Stock | D | 4,500 | $1.19 | 5,600 | D | S |
| 23 Aug, 2017 | Bradley Bremer | Common Stock | D | 475 | $1.25 | 5,125 | D | S |
| 25 May, 2016 | Bradley Bremer | Common Stock | D | 4,900 | $1.25 | 10,100 | D | S |
| 01 Sep, 2015 | Edward R Cameron | Common Stock | A | 100,000 | $0.00 | 422,467 | D | A |
| 01 Sep, 2015 | Edward R Cameron | Stock Option Grant | A | 100,000 | $0.00 | 100,000 | D | A |
| 08 May, 2014 | Steven Lowenthal | Stock Option Grant | A | 10,000 | $0.00 | 10,000 | D | A |
| 08 May, 2014 | Dean Pickerell | Stock Option Grant | A | 10,000 | $0.00 | 10,000 | D | A |