CERTIFICATE OF COMPLETION
This is to certify that Leonardo Barrena Sierrahas successfully completed the Holcim Academy Course for Sustainable Construction in
El futuro de las ciudades regenerativasa program offered by Holcim.
Miljan Gutovic
Chief Executive Officer Holcim
Carmen Diaz
Chief People and Sustainability Officer Holcim
Holcim Academy Certificate:
Issued July 13, 2026
Valid Certificate ID
cd1a8bacb0704bada016d003100a5798