As of September 09, 2026, the three largest insider holders of SMTK are Simon P. King (Director, 7.48Mn shares), Joseph Christopher Lizzio (TenPercentOwner, 419.00K shares), Boer Klaas De (Director, 11.43K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Simon P. King | Director | 0 | 7,476,028 | 7,476,028 | 94.4% | 27 Jan, 2022 |
| 2 | Joseph Christopher Lizzio | TenPercentOwner | 419,000 | 0 | 419,000 | 5.3% | 25 Sep, 2025 |
| 3 | Boer Klaas De | Director | 0 | 11,430 | 11,430 | 0.1% | 05 Jun, 2024 |
| 4 | Ian Jenks | Chairman And Ceo | 10,511 | 0 | 10,511 | 0.1% | 13 Feb, 2024 |
| 5 | Simon Ogier | Chief Technology Officer | 5,760 | 0 | 5,760 | 0.1% | 02 Feb, 2024 |
| 6 | Barbra Keck | Chief Financial Officer | 100 | 0 | 100 | 0.0% | 02 Feb, 2024 |
| 7 | Beverley Brown | Chief Scientist | 100 | 0 | 100 | 0.0% | 02 Feb, 2024 |
| 8 | Steven Denbaars | Director | 0 | 0 | 0 | 0.0% | 02 Feb, 2024 |
| 9 | Melisa Denis | Director | 0 | 0 | 0 | 0.0% | 02 Feb, 2024 |
| 10 | Sriram Krishnamurthy Peruvemba | Director | 0 | 0 | 0 | 0.0% | 02 Feb, 2024 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 10 Sep, 2025 | Joseph Christopher Lizzio | TenPercentOwner | Disposed G | 150,000 | $0.00 | $0 | 419,000 | Direct |
| 03 Sep, 2025 | Steven Denbaars | Director | Acquired A | 22,466 | $0.00 | $0 | 13 | Direct |
| 03 Sep, 2025 | Boer Klaas De | Director | Acquired A | 22,466 | $0.00 | $0 | 22,466 | Direct |
| 03 Sep, 2025 | Ian Jenks | Chairman Ceo | Acquired A | 160,005 | $0.00 | $0 | 160,005 | Direct |
| 03 Sep, 2025 | Sriram Krishnamurthy Peruvemba | Director | Acquired A | 22,466 | $0.00 | $0 | 13 | Direct |
| 03 Sep, 2025 | Melisa Denis | Director | Acquired A | 22,466 | $0.00 | $0 | 13 | Direct |
| 03 Sep, 2025 | Boer Klaas De | Director | Acquired A | 22,466 | $0.00 | $0 | 22,466 | Direct |
| 03 Sep, 2025 | Boer Klaas De | Director | Acquired A | 22,466 | $0.00 | $0 | 22,466 | Direct |
| 03 Sep, 2025 | Barbra Keck | Chief Financial Officer | Acquired A | 71,077 | $0.00 | $0 | 71,077 | Direct |
| 28 May, 2025 | Jonathan Watkins | Chief Operating Officer | Acquired A | 131,745 | $0.00 | $0 | 131,745 | Direct |
| 28 May, 2025 | Ian Jenks | Chairman Ceo | Acquired A | 170,320 | $0.00 | $0 | 170,320 | Direct |
| 28 May, 2025 | Boer Klaas De | Director | Acquired A | 23,915 | $0.00 | $0 | 23,915 | Direct |
| 28 May, 2025 | Sriram Krishnamurthy Peruvemba | Director | Acquired A | 23,915 | $0.00 | $0 | 14 | Direct |
| 28 May, 2025 | Simon Ogier | Chief Technology Officer | Acquired A | 77,656 | $0.00 | $0 | 77,656 | Direct |
| 28 May, 2025 | Jonathan Watkins | Chief Operating Officer | Acquired A | 131,745 | $0.00 | $0 | 131,745 | Direct |
| 28 May, 2025 | Beverley Brown | Chief Scientist | Acquired A | 33,741 | $0.00 | $0 | 33,741 | Direct |
| 28 May, 2025 | Boer Klaas De | Director | Acquired A | 23,915 | $0.00 | $0 | 23,915 | Direct |
| 28 May, 2025 | Barbra Keck | Chief Financial Officer | Acquired A | 75,660 | $0.00 | $0 | 75,660 | Direct |
| 28 May, 2025 | Jonathan Watkins | Chief Operating Officer | Acquired A | 131,745 | $0.00 | $0 | 131,745 | Direct |
| 28 May, 2025 | Boer Klaas De | Director | Acquired A | 23,915 | $0.00 | $0 | 23,915 | Direct |