Perimeter Solutions, Inc. (PRM) Insider Ownership

Historic Insider Ownership Trends

Perimeter Solutions's top three insider shareholders as of March 23, 2026 are Partnership Master Fund, Lp Windacre (TenPercentOwner, 21.85Mn shares), William N Jr Thorndike (Director, 8.54Mn shares), Haitham Khouri (Chief Executive Officer, 2.10Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Partnership Master Fund, Lp Windacre 21,854,600 0 01 Jul, 2025
William N Jr Thorndike 8,535,656 0 11 Mar, 2026
W Nicholas Howley 5,086,840 0 05 Mar, 2026
Haitham Khouri Chief Executive Officer 2,104,150 0 05 Mar, 2026
Haitham Khouri Chief Executive Officer 0 1,225,385 05 Aug, 2024
Vivek Raj 677,560 0 05 Mar, 2026
Shannon Horn Business Director 445,695 0 10 Nov, 2021
Tracy Britt Cool 250,493 0 05 Mar, 2026
Edward D. Goldberg Chief Executive Officer 222,957 0 10 Nov, 2021
Barry Lederman Chief Financial Officer 196,416 0 10 Nov, 2021
Kevin M Stein 0 115,000 10 Nov, 2021
Sean P Hennessy 100,000 0 10 Nov, 2021
Noriko Yokozuka General Counsel 47,157 0 16 Dec, 2025
Stephen Cornwall Chief Commercial Officer 42,087 0 23 Nov, 2021
Jorge Valladares 0 14,000 13 Jun, 2024
Tracy Britt Cool 0 6,200 16 May, 2022

* 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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
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
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
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
06 Mar, 2026 William N Jr Thorndike Common Stock D 100,000 $23.63 8,860,656 D S
03 Mar, 2026 Tracy Britt Cool Common Stock A 65,843 $0.00 250,493 D A
03 Mar, 2026 Haitham Khouri Common Stock A 1,600,317 $0.00 2,104,150 D A
03 Mar, 2026 Vivek Raj Common Stock A 555,859 $0.00 677,560 D A
03 Mar, 2026 W Nicholas Howley Common Stock A 5,582,492 $0.00 6,188,692 D A
03 Mar, 2026 William N Jr Thorndike Common Stock A 5,582,492 $0.00 9,185,656 D A
03 Mar, 2026 W Nicholas Howley Common Stock D 1,101,852 $0.00 5,086,840 D G
26 Feb, 2026 Tracy Britt Cool Stock Option (right to buy) A 6,194 $0.00 6,194 D A
26 Feb, 2026 Kyle Sable Stock Option (right to buy) A 50,000 $0.00 100,000 D A
26 Feb, 2026 Haitham Khouri Stock Option (right to buy) A 88,489 $0.00 88,489 D A
26 Feb, 2026 Grant Bowman Stock Option (right to buy) A 100,000 $0.00 200,000 D A
26 Feb, 2026 Noriko Yokozuka Stock Option (right to buy) A 120,000 $0.00 360,000 D A
26 Feb, 2026 Vivek Raj Stock Option (right to buy) A 6,194 $0.00 6,194 D A
26 Feb, 2026 Iii Jorge L. Valladares Stock Option (right to buy) A 6,194 $0.00 6,194 D A