Perimeter Solutions's top three insider shareholders as of May 30, 2026 are Partnership Master Fund, Lp Windacre (TenPercentOwner, 21.85Mn shares), William N Jr Thorndike (Director, 8.54Mn shares), William N Jr Thorndike (Director, 3.53Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Sean P Hennessy | - | 100,000 | 0 | 10 Nov, 2021 |
| Robert S Henderson | - | 328,416 | 0 | 22 Oct, 2024 |
| W Nicholas Howley | - | 606,200 | 0 | 24 Apr, 2026 |
| Bernt G Ii Iversen | - | 126,861 | 0 | 29 Oct, 2024 |
| Jorge Valladares | - | 0 | 42,000 | 13 Jun, 2024 |
| Ernest C. Ii Kremling | Chief Operating Officer | 150,498 | 0 | 10 Nov, 2021 |
| William N Jr Thorndike | - | 8,535,656 | 0 | 11 Mar, 2026 |
| Tracy Britt Cool | - | 250,493 | 0 | 05 Mar, 2026 |
| Vivek Raj | - | 721,226 | 0 | 12 Nov, 2024 |
| Noriko Yokozuka | General Counsel | 47,157 | 0 | 16 Dec, 2025 |
| Stephen Cornwall | Chief Commercial Officer | 42,087 | 0 | 23 Nov, 2021 |
| Shannon Horn | Business Director | 445,695 | 0 | 10 Nov, 2021 |
| Haitham Khouri | Chief Executive Officer | 2,104,150 | 0 | 05 Mar, 2026 |
| Barry Lederman | Chief Financial Officer | 196,416 | 0 | 10 Nov, 2021 |
| Edward D. Goldberg | Chief Executive Officer | 222,957 | 0 | 10 Nov, 2021 |
| Partnership Master Fund, Lp Windacre | - | 21,854,600 | 0 | 01 Jul, 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 |
|---|---|---|---|---|---|---|---|---|
| 23 Apr, 2026 | W Nicholas Howley | Common Stock | D | 3,480,640 | $0.00 | 606,200 | D | G |
| 01 Apr, 2026 | W Nicholas Howley | Common Stock | D | 1,000,000 | $0.00 | 4,086,840 | D | G |
| 09 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 90,043 | $23.18 | 8,770,613 | D | S |
| 09 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 90,043 | $23.18 | 8,770,613 | D | S |
| 09 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 90,043 | $23.18 | 8,770,613 | D | S |
| 09 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 34,957 | $23.85 | 8,735,656 | D | S |
| 09 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 34,957 | $23.85 | 8,735,656 | D | S |
| 09 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 34,957 | $23.85 | 8,735,656 | D | S |
| 10 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $23.63 | 8,635,656 | D | S |
| 10 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $23.63 | 8,635,656 | D | S |
| 10 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $23.63 | 8,635,656 | D | S |
| 11 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $23.18 | 8,535,656 | D | S |
| 11 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $23.18 | 8,535,656 | D | S |
| 11 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $23.18 | 8,535,656 | D | S |
| 04 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 125,000 | $24.26 | 9,060,656 | D | S |
| 04 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 125,000 | $24.26 | 9,060,656 | D | S |
| 04 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 125,000 | $24.26 | 9,060,656 | D | S |
| 05 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $24.06 | 8,960,656 | D | S |
| 05 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $24.06 | 8,960,656 | D | S |
| 05 Mar, 2026 | William N Jr Thorndike | Common Stock | D | 100,000 | $24.06 | 8,960,656 | D | S |