Clearwater Paper Corp

Rule 10b5-1 Trading Arrangements

During the quarter ended December 31, 2024, the following director and officer (as defined in Rule 16a-1(f) of the Exchange Act)adopted a Rule 10b5-1 trading arrangement, as defined in Item 408 of Regulation S-K, for the sale of our common stock. Shares in the 10b5-1 trading arrangement that are subject to restricted stock units (“RSUs”) and stock options may only be traded following satisfaction of applicable vesting requirements. In addition, because of pricing (such as future share price targets) and timing conditions in the 10b5-1 trading arrangement, it is not yet determinable how many shares actually will be sold under the plan prior to its expiration date.

On November 27, 2024, Kari Moyes, our Senior Vice President, HR, entered into a Rule 10b5-1 trading arrangement that provides for the sale of up to 37,076 shares of our common stock. This trading arrangement is scheduled to expire on March 31, 2026.

This Rule 10b5-1 trading arrangement was entered into in writing during an open trading window and is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and our policies regarding transactions in our securities.

During the quarter ended December 31, 2024, no other directors or officers adopted, modified, orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement”, as defined in Item 408 of Regulation S-K.