Summit Materials, Inc. (NYSE: SUM, “Summit” or the “Company”), a leading vertically integrated construction materials company, today announced that it will release first quarter 2021 financial results after the market closes on Monday, May 10, 2021. A conference call will be held on Tuesday, May 11, 2021 at 11:00 a.m. eastern time (9:00 a.m. mountain time) to review Summit’s financial results, discuss recent events and conduct a question-and-answer session....