SEC Filing Summary

This filing details a transaction by Mathew D. Passarello, Sr. V.P. of Clearwater Paper Corp. On March 15, 2026, 390 shares of Common Stock were disposed of (transaction code F, acquired/disposed code D) at a price of $13.11 per share. This disposition was to satisfy tax withholding requirements related to the settlement of restricted stock units granted in 2025, which vested on the same date. Following this transaction, Mr. Passarello holds 26,393 shares of Common Stock. The footnote F1 clarifies the nature of the shares withheld for tax purposes.