Plug and Play Ventures
Facts
- HQ
- Sunnyvale, California
- Sectors
- Startup support, Corporate innovation, Venture capital, University engagement, Government engagement
Plug and Play Seattle selects 11 startups for 12-week Batch 4, including Tokyo’s Aeterlink; demo day Dec. 3
Plug and Play Seattle selected 11 startups for its fourth 12-week accelerator cohort—10 from Seattle and one from Tokyo—working on technologies from space robotics and data-center optical links to wireless power and antibody therapeutics, with the program running through mid-December and a demo day on Dec. 3 at the Boeing Future of Flight.
Mafix raises $5.4M pre-seed led by Azolla Ventures to commercialize carbon-negative silicon fertilizers
Mafix, a Seattle-based maker of carbon-negative silicon fertilizers and mineral products, raised $5.4M in a pre-seed round led by Azolla Ventures on August 24, 2026. The company will use proceeds to demonstrate production of 1,000 tons of fertilizer, scale its mineral conversion process across feedstocks, and develop next-generation products.
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.
People
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Jack Callaghan Director, Seattle & Partnerships
