Matthew Lanigan sold $2.4M of NPKI stock

Matthew Lanigan, President & CEO of NPK International Inc. (NPKI), sold 167,375 shares of NPKI stock worth $2.4M, per an SEC Form 4 filed Jun 5, 2026.

The sale was pre-arranged (a 10b5-1 plan or an option exercise), not a fresh decision.

The trade happened on Jun 3, 2026, 2 days before it was made public.

NPKI has moved -38.3% since the trade date, from $14.46 to $8.93 (Nov 9, 2026 close).