To receive annual and/or Interim Financial Statements and accompanying Management's Discussion and Analysis, please mark the applicable box. ANNUAL INTERIM To receive future meeting materials by mail check the box to the right. To request materi-als for this meeting refer to the notice included in the package with this form. CONTROL NO.: ➔ VOTING INSTRUCTION FORM IF YOU WISH TO ATTEND THE MEETING OR DESIGNATE ANOTHER PERSON TO ATTEND, VOTE AND ACT ON YOUR BEHALF AT THE MEETING, OR ANY ADJOURNMENT OR POSTPONEMENT THEREOF, OTHER THAN THE PERSON(S) SPECIFIED ABOVE, PRINT YOUR NAME OR THE NAME OF THE OTHER PERSON ATTENDING THE MEETING IN THE SPACE PROVIDED HEREIN. UNLESS YOU INSTRUCT OTHERWISE, THE PERSON WHOSE NAME IS WRITTEN IN THIS SPACE WILL HAVE FULL AUTHORITY TO ATTEND, VOTE AND OTHERWISE ACT IN RESPECT OF ALL MATTERS THAT MAY COME BEFORE THE MEETING OR ANY ADJOURNMENT OR POSTPONEMENT THEREOF, EVEN IF THESE MATTERS ARE NOT SET OUT IN THE FORM OR THE MANAGEMENT PROXY CIRCULAR. FOR VIRTUAL MEETINGS, YOU MAY NEED TO COMPLETE ADDITIONAL INFORMATION OR TAKE ADDITIONAL ACTION FOR YOU OR YOUR APPOINTEE TO ATTEND THE MEETING. PLEASE PRINT APPOINTEE NAME ABOVE APPOINT A PROXY (OPTIONAL) STEP 4 THIS DOCUMENT MUST BE SIGNED AND DATED SIGNATURE(S) *INVALID IF NOT SIGNED* M M D D Y Y COMPLETE YOUR VOTING DIRECTIONS STEP 2 STEP 3 APPOINTEE(S): Michael M. Wilson or, failing him, Robert A. Mionis 01 ELECTION OF DIRECTORS: ITEM(S): HIGHLIGHTED TEXT ACCOUNT NO: CUSIP: CUID: RECORD DATE: PROXY DEPOSIT DATE: March 10, 2023 April 25, 2023 MEETING DATE: Thursday, April 27, 2023 at 9:30 am EDT MEETING TYPE: Annual Meeting Celestica Inc. FOR WITHHOLD 02 Deepak Chopra 03 Françoise Colpron 04 Daniel P. DiMaggio 05 Jill Kale 06 Laurette T. Koellner 08 Luis A. Müller 09 Tawfiq Popatia 01 Robert A. Cascella 07 Robert A. Mionis FOR WITHHOLD FOR WITHHOLD FOR WITHHOLD FOR AGAINST 02 Appointment of KPMG LLP as auditor of Celestica Inc. Authorization of the Board of Directors of Celestica Inc. to fix the remuneration of the auditor. 03 04 Advisory resolution on Celestica Inc.’s approach to executive compensation. E-R3 10 Michael M. Wilson *NOTE* If completing the appointment box above YOU MUST go to http://www.computershare.com/Celestica and provide Computershare with the name and email address of the person you are appointing. Computershare will use this information ONLY to provide the Appointee with an Invitation Code to gain entry to and vote at the online meeting. *NOTE* Under securities regulation and Notice-and-Access procedures, shareholders are being directed to view the meeting-related materials online. Refer to the Notice of Availability of Meeting Materials accompanying this voting instruction form for details. VOTING RECOMMENDATIONS ARE INDICATED BY OVER THE BOXES (FILL IN ONLY ONE BOX “ ” PER ITEM IN BLACK OR BLUE INK) VOTING RECOMMENDATION: FOR ALL THE NOMINEES PROPOSED AS DIRECTORS (FILL IN ONLY ONE BOX “ “ PER NOMINEE IN BLACK OR BLUE INK)