X0306 4 2023-02-27 0 0001441236 Clearwater Paper Corp CLW 0001625459 Murphy Michael John 601 W. RIVERSIDE AVE. STE.1100 SPOKANE WA 99201 0 1 0 0 Sr. VP, CFO Common Stock 2023-02-27 4 A 0 5591 0.00 A 41198 D Common Stock 2023-02-27 4 A 0 33606 38.23 A 74804 D Common Stock 2023-02-27 4 F 0 9408 38.23 D 65396 D Common Stock 2023-02-28 4 S 0 5041 38.33 D 60355 D Represents award of restricted stock units ("RSUs"). RSUs may be settled only for shares of common stock on a one-for-one basis. Represents award of RSUs that will vest 33%, 33%, 34% on March 15, 2024, 2025 and 2026, respectively, assuming continued employment. During the vesting period, an amount equal to the dividends that would have been paid on the RSUs had they been in the form of common stock will be converted into additional RSUs. Represents aggregate number of shares of common stock issuable in settlement of 2020-2022 Performance Share Grant. Represents shares withheld by Clearwater Paper Corporation to satisfy tax witholding requirements due at settlement of 2020-2022 Performance Share Grant. This transaction was executed pursuant to a sale in accordance with a 10b5-1 Trading Plan for tax purposes. This price represents the weighted average purchase price for multiple transactions reported on this line. The price of the transactions reported on this line range between $37.97 to $38.62 per share. Upon request by the Commission staff, the issuer or a security holder of the issuer, the reporting person will undertake to provide full information regarding the number of shares purchased at each separate price within the range. /s/ Michael S. Gadd, Attorney-in-fact 2023-03-01