clw-defa14a_20200513.htm

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

☐	Preliminary Proxy Statement

☐	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐	Definitive Proxy Statement

☒	Definitive Additional Materials

☐	Soliciting Material Pursuant to § 240.14a-11(c) or § 240.14a-12

☒	No fee required.

☐	Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

	(1)	Title of each class of securities to which transaction applies:

	(2)	Aggregate number of securities to which transaction applies:

	(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee is calculated and state how it was determined):

	(4)	Proposed maximum aggregate value of transaction:

	(5)	Total fee paid

☐	Fee paid previously with preliminary materials.

☐	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

	(1)	Amount Previously Paid:

	(2)	Form, Schedule or Registration Statement No.:

	(3)	Filing Party:

	(4)	Date Filed:

	Persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

See the reverse side of this notice to obtainproxy materials and voting instructions.*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for theStockholder Meeting to Be Held on <mtgdate>. You are receiving this communication because you holdshares in the above named company. This is not a ballot. You cannot use this notice to votethese shares. This communication presents only anoverview of the more complete proxy materials that areavailable to you on the Internet. You may view the proxymaterials online at www.proxyvote.com or easily request apaper copy (see reverse side). We encourage you to access and review all of the importantinformation contained in the proxy materials before voting. Meeting InformationMeeting Type:<mtgtype> For holders as of:<recdate> Date: Time: <mtgtime> Location: 0000448476_1 R1.0.1.18CLEARWATER PAPER CORPORATIONCLEARWATER PAPER CORPORATION601 W. RIVERSIDE AVENUESUITE 1100SPOKANE, WA 99201Annual MeetingMarch 16, 2020May 13, 2020May 13, 20209:00 AM PDT601 W. Riverside Ave. Spokane, WA 99201

Please Choose One of the Following Voting MethodsVote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the boxmarked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. How To Vote ..... Before You VoteHow to Access the Proxy MaterialsProxy Materials Available to VIEW or RECEIVE: How to View Online: Have the information that is printed in the box marked by the arrow (located on thefollowing page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge forrequesting a copy. Please choose one of the following methods to make your request: 1)BY INTERNET:www.proxyvote.com2)BY TELEPHONE:1-800-579-16393)BY E-MAIL*:sendmaterial@proxyvote.com*If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box markedby the arrow (located on the following page) in the subject line. ..... ..... 0000448476_2 R1.0.1.181. Notice & Proxy Statement 2. Annual Report/10KRequests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investmentadvisor. Please make the request as instructed above on or before April 29, 2020 to facilitate timely delivery.

Voting items0000448476_3 R1.0.1.18The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees1a Joe W. Laymon1b John P. O'DonnellThe Board of Directors recommends you vote FOR proposals 2, 3 and 4.2. Ratification of the appointment of KPMG, LLP as the Company's independent registered public accounting firm for 2020.3. Advisory vote to approve named executive officer compensation. 4 Approval of amendments to Clearwater Paper Corporation 2017 Stock Incentive Plan. NOTE: THIS PROXY WILL BE VOTED AS DIRECTED BUT IF NOT OTHERWISE DIRECTED, FOR EACH DIRECTOR NOMINEE AND FORPROPOSALS 2, 3 & 4.