SLDP's three largest insider shareholders as of September 29, 2026 are Energy Technologies, Llc Volta (TenPercentOwner, 17.40Mn shares), Douglas M Campbell (Chief Executive Officer, 9.70Mn shares), Plus Acquisition Sponsor Iii Llc Decarbonization (TenPercentOwner, 8.39Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Energy Technologies, Llc Volta | TenPercentOwner | 0 | 17,399,807 | 17,399,807 | 32.2% | 27 Jun, 2022 |
| 2 | Douglas M Campbell | Chief Executive Officer | 9,700,214 | 0 | 9,700,214 | 17.9% | 31 Aug, 2022 |
| 3 | Plus Acquisition Sponsor Iii Llc Decarbonization | TenPercentOwner | 0 | 8,390,000 | 8,390,000 | 15.5% | 27 Oct, 2021 |
| 4 | David M Leuschen | TenPercentOwner | 0 | 4,738,454 | 4,738,454 | 8.8% | 26 Jan, 2023 |
| 5 | Scoter John C. Van | President Ceo | 4,717,639 | 0 | 4,717,639 | 8.7% | 01 Jul, 2026 |
| 6 | Linda C. Heller | Cfo, Treasurer, Secretary | 1,948,844 | 0 | 1,948,844 | 3.6% | 01 Jul, 2026 |
| 7 | Joshua Buettner-Garrett | Chief Technology Officer | 1,366,018 | 0 | 1,366,018 | 2.5% | 01 Jul, 2026 |
| 8 | Derek Colby Johnson | Chief Operating Officer | 832,254 | 0 | 832,254 | 1.5% | 02 Jan, 2025 |
| 9 | David B Jansen | President; Interim Ceo | 757,102 | 0 | 757,102 | 1.4% | 12 May, 2023 |
| 10 | Kevin A. Paprzycki | Cfo Treasurer | 738,364 | 0 | 738,364 | 1.4% | 13 May, 2024 |
| 11 | James Liebscher | Chief Legal Officer Sec | 667,157 | 0 | 667,157 | 1.2% | 13 May, 2025 |
| 12 | Susan M Kreh | Director | 351,621 | 0 | 351,621 | 0.7% | 21 May, 2026 |
| 13 | Kaled Awada | Director | 351,621 | 0 | 351,621 | 0.7% | 21 May, 2026 |
| 14 | Aleksandra A Miziolek | Director | 341,062 | 0 | 341,062 | 0.6% | 21 May, 2026 |
| 15 | Maryann Wright | Director | 331,730 | 0 | 331,730 | 0.6% | 21 May, 2026 |
| 16 | John Joseph Stephens | Director | 320,203 | 0 | 320,203 | 0.6% | 21 May, 2026 |
| 17 | Erik J Anderson | Director | 304,503 | 0 | 304,503 | 0.6% | 21 May, 2026 |
| 18 | Lesa B Roe | Director | 243,975 | 0 | 243,975 | 0.5% | 21 May, 2026 |
| 19 | James Ac Mcdermott | Director | 240,000 | 0 | 240,000 | 0.4% | 27 Oct, 2021 |
| 20 | Steven H Goldberg | Director | 162,941 | 0 | 162,941 | 0.3% | 21 May, 2026 |
| 21 | Jon Eric Jacobs | Chief Marketing Officer | 45,728 | 0 | 45,728 | 0.1% | 13 May, 2022 |
| 22 | Jane Kearns | Director | 40,000 | 0 | 40,000 | 0.1% | 27 Oct, 2021 |
| 23 | Jennifer Aaker | Director | 40,000 | 0 | 40,000 | 0.1% | 10 Dec, 2021 |
| 24 | Jeffrey Tepper | Director | 40,000 | 0 | 40,000 | 0.1% | 27 Oct, 2021 |
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 |
|---|---|---|---|---|---|---|---|---|
| 30 Jun, 2026 | Linda C. Heller | Cfo, Treasurer, Secretary | Disposed F | 72,310 | $2.60 | $188.01K | 1,948,844 | Direct |
| 30 Jun, 2026 | Joshua Buettner-Garrett | Chief Technology Officer | Disposed F | 33,824 | $2.60 | $87.94K | 1,366,018 | Direct |
| 30 Jun, 2026 | Scoter John C. Van | President Ceo | Disposed F | 154,512 | $2.60 | $401.73K | 4,717,639 | Direct |
| 20 May, 2026 | Erik J Anderson | Director | Acquired A | 44,133 | $0.00 | $0 | 304,503 | Direct |
| 20 May, 2026 | Kaled Awada | Director | Acquired A | 44,133 | $0.00 | $0 | 351,621 | Direct |
| 20 May, 2026 | John Joseph Stephens | Director | Acquired A | 44,133 | $0.00 | $0 | 320,203 | Direct |
| 20 May, 2026 | Susan M Kreh | Director | Acquired A | 44,133 | $0.00 | $0 | 351,621 | Direct |
| 20 May, 2026 | Steven H Goldberg | Director | Acquired A | 44,133 | $0.00 | $0 | 162,941 | Direct |
| 20 May, 2026 | Aleksandra A Miziolek | Director | Acquired A | 44,133 | $0.00 | $0 | 341,062 | Direct |
| 20 May, 2026 | Steven H Goldberg | Director | Acquired A | 44,133 | $0.00 | $0 | 162,941 | Direct |
| 20 May, 2026 | Maryann Wright | Director | Acquired A | 44,133 | $0.00 | $0 | 331,730 | Direct |
| 20 May, 2026 | Lesa B Roe | Director | Acquired A | 44,133 | $0.00 | $0 | 283,182 | Direct |
| 20 May, 2026 | Lesa B Roe | Director | Disposed S | 39,207 | $2.66 | $104.29K | 243,975 | Direct |
| 12 May, 2026 | Joshua Buettner-Garrett | Chief Technology Officer | Disposed F | 5,519 | $3.15 | $17.38K | 1,399,842 | Direct |
| 11 May, 2026 | Scoter John C. Van | President Ceo | Disposed F | 308,010 | $3.08 | $947.13K | 4,872,151 | Direct |
| 11 May, 2026 | Linda C. Heller | Cfo, Treasurer, Secretary | Disposed F | 136,122 | $3.08 | $418.58K | 2,021,154 | Direct |
| 11 May, 2026 | Joshua Buettner-Garrett | Chief Technology Officer | Disposed F | 58,082 | $3.08 | $178.60K | 1,405,361 | Direct |
| 31 Mar, 2026 | Joshua Buettner-Garrett | Chief Technology Officer | Disposed F | 14,284 | $2.82 | $40.28K | 1,279,925 | Direct |
| 31 Mar, 2026 | Scoter John C. Van | President Ceo | Disposed F | 42,842 | $2.82 | $120.81K | 3,912,333 | Direct |
| 31 Mar, 2026 | Linda C. Heller | Cfo, Treasurer, Secretary | Disposed F | 26,659 | $2.82 | $75.18K | 1,776,928 | Direct |