SCHEDULE 13G/A 0000919859 XXXXXXXX LIVE 12 Common Shares 06/30/2025 0001131383 STANTEC INC 85472N109 300 10220 103 AVENUE NW EDMONTON ALBERTA T5J 0K4 CANADA EDMONTON A0 00000 Rule 13d-1(c) MACKENZIE FINANCIAL CORP b A6 6166496.00 0.00 6166496.00 0.00 6166496.00 5.4 IA STANTEC INC 300 10220 103 AVENUE NW, EDMONTON ALBERTA T5J 0K4 CANADA, EDMONTON, ALBERTA, CANADA, 00000 Mackenzie Financial Corporation 180 Queen Street West, Toronto, Ontario M5V 3K1 Organized in Toronto, Ontario, Canada N IA 6,166,496 5.41 6,166,496 0 6,166,496 0 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. MACKENZIE FINANCIAL CORP Gillian Seidler 08/14/2025