Fireside Chat With Summit

Oct. 11, 2023 – Summit Materials Inc. announced that Anne Noonan, Summit’s president and CEO, and Scott Anderson, Summit’s executive vice president and CFO, will discuss its merger with Argos USA with covering analyst Trey Grooms, from Stephens. The discussion will take place during a fireside chat at 8:00 a.m. Eastern time (6:00 a.m. Mountain time) on Thursday, Oct. 19. The conversation will highlight the strategic and financial merits of the combination, address priority investor questions, and provide any relevant status updates since the announcement. The fireside chat can be accessed live via Summit’s website at investors.summit-materials.com or at the following link: https://stephens.zoom.us/j/96562683354.