CERTIFICATE OF COMPLETION
This is to certify that Nathan John Siahas successfully completed the Holcim Academy Course for Sustainable Construction in
Concrete Essentials—Basic Properties of Concretea program offered by Holcim.
Miljan Gutovic
Chief Executive Officer Holcim
Carmen Diaz
Chief People and Sustainability Officer Holcim
Holcim Academy Certificate:
Issued November 6, 2024
Valid Certificate ID
86897fc4d5c240e1bdc376e4d94b72c5