Zach Coelius

Zach Coelius is a prominent angel investor and the Managing Partner at Coelius Capital, known for his deep entrepreneurial background and active involvement in the early-stage startup ecosystem. Based in San Francisco, Coelius brings a founder-first perspective to his investments, having successfully built and exited multiple companies, including Triggit, an ad-tech platform acquired by Gravity4 in 2015, and Wittlebee. This hands-on experience as an operator allows him to provide valuable strategic guidance and mentorship to the founders he backs.

Coelius Capital primarily focuses on pre-seed and seed-stage investments, targeting disruptive technology companies with strong technical teams. While his portfolio spans various sectors, he has shown a particular interest in areas such as artificial intelligence, SaaS, developer tools, and frontier tech. He is known for identifying promising startups early on, often before they gain widespread attention, and for his willingness to take calculated risks on innovative ideas. His investment philosophy emphasizes long-term partnerships and supporting founders through the challenging initial phases of company building.

His typical first check sizes generally range from $100,000 to $500,000, positioning him as a significant early-stage capital provider for nascent ventures. Coelius is a prolific investor, with public data indicating participation in over 100 individual startup investments. He frequently co-invests alongside other angels and venture capital firms in larger seed rounds, leveraging his network to help portfolio companies secure follow-on funding and strategic partnerships. His reputation as a founder-friendly and insightful investor makes him a sought-after partner for early-stage entrepreneurs.