Perimeter Solutions, Inc. (PRM) Insider Ownership

Historic Insider Ownership Trends

As of May 04, 2026, the three largest insider holders of PRM are Partnership Master Fund, Lp Windacre (TenPercentOwner, 21.85Mn shares), Partnership Master Fund, Lp Windacre (TenPercentOwner, 21.85Mn shares), William N Jr Thorndike (Director, 8.54Mn 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
Partnership Master Fund, Lp Windacre - 21,854,600 0 01 Jul, 2025
William N Jr Thorndike - 8,535,656 0 11 Mar, 2026
William N Jr Thorndike - 8,535,656 0 11 Mar, 2026
William N Jr Thorndike - 3,530,082 0 08 Nov, 2024
William N Jr Thorndike - 3,530,082 0 08 Nov, 2024
Haitham Khouri Chief Executive Officer 2,104,150 0 05 Mar, 2026
Haitham Khouri Chief Executive Officer 0 1,475,385 05 Aug, 2024
Vivek Raj - 721,226 0 12 Nov, 2024
Vivek Raj - 721,226 0 12 Nov, 2024
Vivek Raj - 677,560 0 05 Mar, 2026
Vivek Raj - 677,560 0 05 Mar, 2026
W Nicholas Howley - 606,200 0 24 Apr, 2026
W Nicholas Howley - 606,200 0 22 Oct, 2024
Shannon Horn Business Director 445,695 0 10 Nov, 2021
Robert S Henderson - 328,416 0 22 Oct, 2024
Haitham Khouri Chief Executive Officer 259,989 0 06 Nov, 2024
Tracy Britt Cool - 250,493 0 05 Mar, 2026
Tracy Britt Cool - 223,449 0 22 Oct, 2024
Edward D. Goldberg Chief Executive Officer 222,957 0 10 Nov, 2021
Barry Lederman Chief Financial Officer 196,416 0 10 Nov, 2021
Ernest C. Ii Kremling Chief Operating Officer 150,498 0 10 Nov, 2021
Bernt G Ii Iversen - 126,861 0 29 Oct, 2024
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
Noriko Yokozuka General Counsel 47,157 0 16 Dec, 2025
Noriko Yokozuka General Counsel 47,157 0 10 Nov, 2021
Noriko Yokozuka General Counsel 47,157 0 10 Nov, 2021
Stephen Cornwall Chief Commercial Officer 42,087 0 23 Nov, 2021
Jorge Valladares - 0 42,000 13 Jun, 2024
Jorge Valladares - 0 42,000 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
23 Apr, 2026 W Nicholas Howley Common Stock D 3,480,640 $0.00 606,200 D G
23 Apr, 2026 W Nicholas Howley Common Stock D 3,480,640 $0.00 606,200 D G
23 Apr, 2026 W Nicholas Howley Common Stock D 3,480,640 $0.00 606,200 D G
23 Apr, 2026 W Nicholas Howley Common Stock D 3,480,640 $0.00 606,200 D G
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 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 William N Jr Thorndike Common Stock A 5,582,492 $0.00 9,185,656 D A
03 Mar, 2026 Haitham Khouri Common Stock A 1,600,317 $0.00 2,104,150 D A
03 Mar, 2026 W Nicholas Howley Common Stock A 5,582,492 $0.00 6,188,692 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 D 1,101,852 $0.00 5,086,840 D G
26 Feb, 2026 Kyle Sable Stock Option (right to buy) A 50,000 $0.00 100,000 D A