As of October 03, 2026, the three largest insider holders of SNDK are Digital Corp Western (TenPercentOwner, 7.51Mn shares), David Goeckeler (Chairman Ceo, 382.87K shares), Luis Felipe Visoso (Evp Cfo, 132.61K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Digital Corp Western | TenPercentOwner | 7,513,019 | 0 | 7,513,019 | 92.1% | 09 Jun, 2025 |
| 2 | David Goeckeler | Chairman Ceo | 382,865 | 0 | 382,865 | 4.7% | 21 Sep, 2026 |
| 3 | Luis Felipe Visoso | Evp Cfo | 132,611 | 0 | 132,611 | 1.6% | 21 Sep, 2026 |
| 4 | Alper Ilkbahar | Evp Chief Technology Officer | 42,109 | 0 | 42,109 | 0.5% | 21 Sep, 2026 |
| 5 | Bernard Shek | Chief Legal Officer And Secty | 25,588 | 0 | 25,588 | 0.3% | 02 Oct, 2026 |
| 6 | Michael Pokorny | Vp, Chief Accounting Officer | 21,550 | 0 | 21,550 | 0.3% | 21 Sep, 2026 |
| 7 | Miyuki Suzuki | Director | 9,907 | 0 | 9,907 | 0.1% | 26 Feb, 2026 |
| 8 | Kimberly Alexy | Director | 5,401 | 0 | 5,401 | 0.1% | 04 Mar, 2025 |
| 9 | Richard B. Ii Cassidy | Director | 4,914 | 0 | 4,914 | 0.1% | 19 Nov, 2025 |
| 10 | Matthew E Massengill | Director | 4,840 | 0 | 4,840 | 0.1% | 04 Mar, 2025 |
| 11 | Thomas Caulfield | Director | 0 | 4,834 | 4,834 | 0.1% | 14 May, 2026 |
| 12 | Devinder Kumar | Director | 4,769 | 0 | 4,769 | 0.1% | 19 Nov, 2025 |
| 13 | Ellyn Shook | Director | 4,750 | 0 | 4,750 | 0.1% | 19 Nov, 2025 |
| 14 | Necip Sayiner | Director | 2,900 | 0 | 2,900 | 0.0% | 11 May, 2026 |
| 15 | Alexander R. Bradley | Director | 863 | 0 | 863 | 0.0% | 02 Jan, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 01 Oct, 2026 | Bernard Shek | Chief Legal Officer And Secty | Disposed S | 600 | $1,734.94 | $1.04Mn | 25,588 | Direct |
| 17 Sep, 2026 | Alper Ilkbahar | Evp Chief Technology Officer | Acquired A | 1,619 | $0.00 | $0 | 42,109 | Direct |
| 17 Sep, 2026 | Luis Felipe Visoso | Evp Cfo | Acquired A | 1,635 | $0.00 | $0 | 132,611 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Acquired A | 3,296 | $0.00 | $0 | 416,706 | Direct |
| 17 Sep, 2026 | Bernard Shek | Chief Legal Officer And Secty | Acquired A | 1,001 | $0.00 | $0 | 26,306 | Direct |
| 17 Sep, 2026 | Michael Pokorny | Vp, Chief Accounting Officer | Acquired A | 458 | $0.00 | $0 | 21,550 | Direct |
| 20 Sep, 2026 | Bernard Shek | Chief Legal Officer And Secty | Disposed F | 118 | $1,791.82 | $211.43K | 26,188 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 40 | $1,567.26 | $62.69K | 416,666 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 9,604 | $1,569.00 | $15.07Mn | 407,062 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 910 | $1,570.04 | $1.43Mn | 406,152 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 4,558 | $1,571.21 | $7.16Mn | 401,594 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 1,157 | $1,572.60 | $1.82Mn | 400,437 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 306 | $1,573.15 | $481.39K | 400,131 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 2,588 | $1,574.57 | $4.07Mn | 397,543 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 2,778 | $1,575.58 | $4.38Mn | 394,765 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 4,139 | $1,576.82 | $6.53Mn | 390,626 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 2,876 | $1,578.34 | $4.54Mn | 387,750 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 640 | $1,579.41 | $1.01Mn | 387,110 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 1,480 | $1,580.25 | $2.34Mn | 385,630 | Direct |
| 17 Sep, 2026 | David Goeckeler | Chairman Ceo | Disposed S | 1,080 | $1,583.80 | $1.71Mn | 384,550 | Direct |