Cauldron Ferm has turned microbes into nonstop assembly lines

Cauldron Ferm, a startup with roots tracing back to the 1960s and 1970s, has developed a continuous fermentation technology that transforms microbes into nonstop production lines. Unlike traditional batch fermentation—common in breweries and vineyards—where the process halts to harvest the product, Cauldron’s “hyper fermentation” keeps microbes in a maximally productive state, enabling uninterrupted output. This innovation addresses the cost and efficiency challenges of producing microbial proteins and fats for food, which require cheaper production methods compared to premium products like alcohol. The company modifies existing batch fermenters slightly to implement its process and customizes microbial growth conditions to optimize yields. Since Michele Stansfield joined the company in 2012, she has shifted Cauldron from a small fee-for-service operation to a fast-moving startup, acquiring intellectual property and raising significant funding. The company recently closed a $13.25 million Series A2 round, led by Main Sequence Ventures, following a $6.5 million raise earlier