CERTIFICATE OF COMPLETION
This is to certify that Leonardo Barrena Sierrahas successfully completed the Holcim Academy Course for Sustainable Construction in
Cemento y hormigón con bajas emisiones de carbonoa program offered by Holcim.
Miljan Gutovic
Chief Executive Officer Holcim
Carmen Diaz
Chief People and Sustainability Officer Holcim
Holcim Academy Certificate:
Issued July 6, 2026
Valid Certificate ID
4c1dc24e17a64ec981f7faa2cdeda52a