144 0002001580 XXXXXXXX LIVE 0001880319 PERIMETER SOLUTIONS, INC. 001-41027 8000 Maryland Avenue, Suite 350 Clayton MO 63105 (314) 396-7343 KYLE J SABLE Officer Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

30000 952356.00 163127063 05/12/2026 NYSE Common 05/12/2026 Exercise of options under a registered plan Issuer N 30000 05/12/2026 Cash N KYLE J SABLE

8000 Maryland Avenue, Suite 350 Clayton MO 63105

Common 05/11/2026 20460 672849.61 KYLE J SABLE

8000 Maryland Avenue, Suite 350 Clayton MO 63105

Common 05/08/2026 150000 4729194.00 05/12/2026 /s/ Kyle Sable