X0508 4/A 2026-03-08 2026-03-10 0000066570 MSA Safety Inc MSA 0001564614 Vartanian Nishan J. 1000 CRANBERRY WOODS DRIVE CRANBERRY WOODS TOWNSHIP PA 16066 1 1 Chairman 0 Common Stock, no par value 2026-03-08 4 A 0 60786.0000 0.0000 A 95096.0000 D This amendment is filed to amend the number of shares reported as awarded under performance stock units in the original Form 4, which amount was incorrect due to administrative error, and is deemed to amend the number of shares reported as securities beneficially owned following the reported transactions in Table I to reflect the correction. Richard W. Roda, Attorney in Fact 2026-03-10