Windfall Bio auctions bioreactors and lab equipment as methane-to-fertilizer startup retrenches
Windfall Bio, a California-based startup developing technology to convert waste methane into organic fertilizer, is auctioning laboratory and bioreactor equipment at facilities in California and Texas, signaling a major retrenchment for one of the best-funded companies in the emerging methane-to-fertilizer sector.
According to listings reported by AgFunderNews, auctioneer Silicon Valley Disposition is selling research instruments and laboratory equipment from Windfall’s headquarters in San Mateo, California. Assets include LC/MS/MS, GC/MS and HPLC systems, bench-top bioreactors, incubator shakers, a freeze dryer and other research equipment. A separate auction at the company’s demonstration facility in Humble, Texas, includes large-scale bioreactors and related process equipment used for pilot-scale production.
Founded in 2022 by Josh Silverman, Windfall Bio developed a platform that uses methane-consuming microbes to capture emissions from sources such as dairy farms and landfills. The microbes produce nitrogen-rich biomass that can be used as a fertilizer or soil amendment. The company attracted significant investor interest, raising $9 million in a seed round in 2023 and an additional $28 million Series A round in 2024. Investors included Prelude Ventures and Amazon’s Climate Pledge Fund.
The asset sales come as agrifoodtech and biomanufacturing startups continue to face challenging fundraising conditions, particularly for businesses requiring substantial capital to scale production. Windfall has not publicly disclosed whether the auctions are part of a restructuring effort or a broader wind-down of operations. However, the scope of the equipment being sold suggests a significant reduction in research and development and demonstration-scale activities.
Source: AgFunderNews
Windfall Bio: Five Things to Know
The company uses methanotrophs, microbes that feed on methane, to convert emissions from dairy farms and landfills into nitrogen-rich biomass. That biomass can be processed into organic fertilizer or spread directly on fields, tackling a potent greenhouse gas and a fertilizer need at once.
Windfall raised about $37M in total, comprising a $9M seed round in 2023 and a $28M Series A in 2024. Investors included Prelude Ventures and Amazon’s Climate Pledge Fund. The company was founded in 2022 by Josh Silverman.
Silicon Valley Disposition is handling the sales. The San Mateo auction lists research instruments such as LC/MS/MS, GC/MS and HPLC systems, a freeze dryer, incubator shakers and bench-top bioreactors. A separate auction in Humble, Texas, covers large-scale bioreactor and support equipment from the demonstration plant.
Windfall has not publicly confirmed a wind-down or detailed its future plans. The scale of the equipment being sold across both sites suggests a significant retreat from its earlier expansion, but its formal corporate status has not been disclosed.
Windfall was a prominent name in the methane-to-fertilizer niche, blending climate-tech and biofertilizer appeal. Its pullback underlines how hard it remains to scale biological fertilizer alternatives profitably, and how cautious investors have become toward capital-heavy ag-biomanufacturing.
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