SCHEDULE 14A INFORMATION

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

(Amendment No.     )

Filed by the Registrant  ☒                            Filed by a Party other than the Registrant  ☐

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☐	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

CLEARWATER PAPER CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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BARCODE 1 OF 2 12 15 1234567 1234567 1234567 1234567 1234567 1234567 1234567 See the reverse side of this notice to obtain proxy materials and voting instructions. Broadridge Internal Use Only Job # Envelope # Sequence # # of # Sequence # *** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on <mtgdate>. You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. Meeting Information Meeting Type: <mtgtype> For holders as of: <recdate> Date: Time: <mtgtime> Location: 0000406806_1 R1.0.1.18 CLEARWATER PAPER CORPORATION CLEARWATER PAPER CORPORATION 601 W. RIVERSIDE AVENUE SUITE 1100 SPOKANE, WA 99201 Investor Address Line 1 Investor Address Line 2 Investor Address Line 3 Investor Address Line 4 Investor Address Line 5 John Sample 1234 ANYWHERE STREET ANY CITY, ON A1A 1A1 Annual Meeting March 18, 2019 May 13, 2019 May 13, 2019 9:00 AM PDT Grand Hyatt 721 Pine Street Seattle, WA 98101

Internal Use Only Please Choose One of the Following Voting Methods Vote 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 box marked 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 g Before You Vote How to Access the Proxy Materials Proxy 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 the following 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 for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) 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 marked by the arrow (located on the following page) in the subject line. g g 0000406806_2 R1.0.1.18 1. Notice & Proxy Statement 2. Annual Report/10K Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 29, 2019 to facilitate timely delivery.

BARCODE 123456789012 123456789012 123456789012 123456789012 123456789012 123456789012 123456789012 123456789012 123456789012 123456789012 123456789012 123456789012 Broadridge Internal Use Only xxxxxxxxxx xxxxxxxxxx Cusip Job # Envelope # Sequence # # of # Sequence # Voting items 0000406806_3 R1.0.1.18 The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees 1a Kevin J. Hunt 1b William D. Larsson The Board of Directors recommends you vote FOR proposals 2 and 3. 2. Ratification of the appointment of KPMG, LLP as the Company's independent registered public accounting firm for 2019. 3. Advisory vote to approve named executive officer compensation. NOTE: THIS PROXY WILL BE VOTED AS DIRECTED BUT IF NOT OTHERWISE DIRECTED, FOR EACH DIRECTOR NOMINEE AND FOR PROPOSALS 2 & 3.

THIS SPACE RESERVED FOR SIGNATURES IF APPLICABLE Reserved for Broadridge Internal Control Information Broadridge Internal Use Only Job # Envelope # Sequence # # of # Sequence # NAME THE COMPANY NAME INC. - COMMON 123,456,789,012.12345 THE COMPANY NAME INC. - CLASS A 123,456,789,012.12345 THE COMPANY NAME INC. - CLASS B 123,456,789,012.12345 THE COMPANY NAME INC. - CLASS C 123,456,789,012.12345 THE COMPANY NAME INC. - CLASS D 123,456,789,012.12345 THE COMPANY NAME INC. - CLASS E 123,456,789,012.12345 THE COMPANY NAME INC. - CLASS F 123,456,789,012.12345 THE COMPANY NAME INC. - 401 K 123,456,789,012.12345 0000406806_4 R1.0.1.18