Based on data from the past 90 days ending January 13, 2026, Perimeter Solutions's three largest insider shareholders are TenPercentOwner Partnership Master Fund, Lp Windacre (21.85Mn shares), Director William N Jr Thorndike (3.60Mn shares), Chief Executive Officer Haitham Khouri (1.73Mn shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Partnership Master Fund, Lp Windacre | 21,854,600 | 01 Jul, 2025 | |
| William N Jr Thorndike | 3,603,164 | 11 Dec, 2025 | |
| Haitham Khouri | Chief Executive Officer | 1,729,218 | 24 Jun, 2025 |
| W Nicholas Howley | 606,200 | 26 Nov, 2025 | |
| Shannon Horn | Business Director | 445,695 | 10 Nov, 2021 |
| Robert S Henderson | 328,416 | 22 Oct, 2024 | |
| Edward D. Goldberg | Chief Executive Officer | 222,957 | 10 Nov, 2021 |
| Barry Lederman | Chief Financial Officer | 196,416 | 10 Nov, 2021 |
| Tracy Britt Cool | 190,850 | 24 Jun, 2025 | |
| Ernest C. Ii Kremling | Chief Operating Officer | 150,498 | 10 Nov, 2021 |
| Bernt G Ii Iversen | 126,861 | 29 Oct, 2024 | |
| Vivek Raj | 121,701 | 15 Sep, 2025 | |
| Kevin M Stein | 115,000 | 10 Nov, 2021 | |
| Sean P Hennessy | 100,000 | 10 Nov, 2021 | |
| Noriko Yokozuka | General Counsel | 47,157 | 16 Dec, 2025 |
| Stephen Cornwall | Chief Commercial Officer | 42,087 | 23 Nov, 2021 |
| Jorge Valladares | 14,000 | 13 Jun, 2024 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 12 Dec, 2025 | Noriko Yokozuka | Common Stock | D | 137,500 | $28.44 | 47,157 | D | S |
| 12 Dec, 2025 | Noriko Yokozuka | Common Stock | A | 17,500 | $10.00 | 64,657 | D | M |
| 12 Dec, 2025 | Noriko Yokozuka | Common Stock | A | 120,000 | $10.00 | 184,657 | D | M |
| 12 Dec, 2025 | Kyle Sable | Common Stock | A | 100,000 | $8.36 | 100,000 | D | M |
| 12 Dec, 2025 | Kyle Sable | Common Stock | D | 100,000 | $28.47 | 0 | D | S |
| 09 Dec, 2025 | William N Jr Thorndike | Common Stock | D | 673,685 | $0.00 | 3,603,164 | D | G |
| 24 Nov, 2025 | W Nicholas Howley | Common Stock | D | 746,767 | $0.00 | 606,200 | D | G |
| 11 Sep, 2025 | Vivek Raj | Common Stock | D | 25,000 | $22.45 | 121,701 | D | S |
| 11 Sep, 2025 | Vivek Raj | - | - | 121,701 | D | |||
| 05 Sep, 2025 | Kyle Sable | Common Stock | D | 40,000 | $22.05 | 0 | D | S |
| 05 Sep, 2025 | Kyle Sable | Common Stock | A | 40,000 | $3.89 | 40,000 | D | M |
| 04 Sep, 2025 | Jeffrey Emery | Common Stock | A | 300,000 | $8.36 | 300,000 | D | M |
| 04 Sep, 2025 | Jeffrey Emery | - | - | 300,000 | D | |||
| 04 Sep, 2025 | Jeffrey Emery | Common Stock | D | 300,000 | $22.28 | 0 | D | S |
| 04 Sep, 2025 | Jeffrey Emery | - | - | 0 | D | |||
| 27 Jun, 2025 | Partnership Master Fund, Lp Windacre | Ordinary shares | A | 254,600 | $13.98 | 21,854,600 | D | P |
| 27 Jun, 2025 | Partnership Master Fund, Lp Windacre | - | - | 21,854,600 | D | |||
| 20 Jun, 2025 | W Nicholas Howley | Common Stock | A | 746,767 | $0.00 | 1,352,967 | D | J |
| 20 Jun, 2025 | W Nicholas Howley | - | - | 1,352,967 | D | |||
| 20 Jun, 2025 | William N Jr Thorndike | Common Stock | A | 746,767 | $0.00 | 4,276,849 | D | J |