Holcim backs 44.01’s rock-based carbon storage technology

06 / 11 / 2026

By Marwa Nassar - -

Holcim has invested in 44.01, a developer of carbon mineralization technology that permanently stores captured carbon dioxide (CO2) underground by converting it into solid rock, supporting the company’s scale-up and international expansion.

The investment builds on an existing commercial partnership between the two companies, which have been testing the technology under industrial conditions at Holcim’s Fujairah cement plant in the United Arab Emirates since July. The pilot project injects captured CO2 into naturally reactive ultramafic rock formations, where it mineralizes into stable carbonate rock.

Expanding carbon storage:

The Fujairah project is already storing captured CO2 underground, demonstrating the potential to deploy carbon mineralization close to industrial production sites.

“Holcim’s investment in 44.01 builds on our existing project in the UAE, where together we are already storing captured carbon in rock formations near our Fujairah plant,” said Ram Muthu, Head of Operational Excellence at Holcim.

He said the technology could enable carbon storage near production sites where geological conditions permit, supporting Holcim’s decarbonization goals under its NextGen Growth 2030 strategy. It could also help the company manage captured carbon at inland facilities where access to offshore storage is limited.

Growing decarbonization portfolio:

The investment adds to Holcim’s portfolio of digital and decarbonization technologies through its open innovation ecosystem.

Other investors in 44.01 include JERA, Breakthrough Energy Ventures, Equinor Ventures, Air Liquide Venture Capital and Siemens Financial Services.

Holcim has made 22 investments through Holcim MAQER Ventures, its corporate venture capital and open innovation unit, as it seeks to scale technologies for the built environment.