William Reed

Mafix raises $5.4M pre-seed to commercialize silicon fertilizer that boosts soil health and removes CO2

Mafix, a Stanford spin-out, raised $5.4 million in a pre-seed round to scale production of a silicon-based fertilizer that speeds silicate rock weathering for soil and crop benefits and can convert CO2 to stable bicarbonate. The Seattle agtech will use cement kilns to produce at least 1,000 tons for larger field trials while leveraging idle kiln capacity to reduce scale-up costs.