SUMMIT MATERIALS,INC. (NYSE:SUM) Files An 8-K Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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SUMMIT MATERIALS,INC. (NYSE:SUM) Files An 8-K Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

SUMMIT MATERIALS,INC. (NYSE:SUM) Files An 8-K Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers
Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

As previously disclosed, on August9, 2018, Neil P. Simpkins informed Summit Materials,Inc. (the “Company”) that he intended to resign from the Board of Directors of the Company (the “Board”), effective as of December29, 2018. Accordingly, on December 29, 2018, Mr.Simpkins resigned from the Board and as a member of both the Compensation Committee of the Board (the “Compensation Committee”) and the Nominating and Corporate Governance Committee of the Board (the “Nominating Committee”). Mr.Simpkins’s decision to resign from the Board did not involve any disagreement on any matter relating to the Company’s operations, policies or practices.

Effective upon Mr.Simpkins’s departure: the size of the Board was reduced from ten to nine members; Steven H. Wunning assumed the role of Chair of the Compensation Committee, replacing Mr.Simpkins; and Ted A. Gardner was relieved of his role as a member of the Audit Committee of the Board and appointed as Chair of the Nominating Committee, replacing Howard L. Lance. Mr.Lance will continue to serve as Chairman of the Board and as a member of both the Compensation Committee and the Nominating Committee.

About SUMMIT MATERIALS,INC. (NYSE:SUM)

Summit Materials, Inc. is a construction materials company. The Company operates through three segments: the west segment, which includes operations in Texas, the Mountain states of Utah, Colorado, Idaho and Wyoming, and in British Columbia, Canada; east segment, which serves markets across the Midwestern and Eastern United States, and Cement segment, which consists of its Hannibal, Missouri and Davenport, Iowa cement plants and approximately eight distribution terminals along the Mississippi River from Minnesota to Louisiana. It supplies aggregates, ready-mixed concrete, asphalt paving mix and paving and related services in the West segment, and aggregates, ready-mixed concrete, asphalt paving mix and paving and related services in east segment. The Company has operations in approximately 20 states in the United States and in British Columbia, Canada. The Company serves markets, including residential construction, nonresidential construction and public infrastructure construction.