Mike Firmage – Startup Investor Profile

Mike Firmage, Co-Founder and Managing Director at Horizon Partners, was named Boutique Investment Banker of the Year for innovation in boutique M&A firm design, process delivery, and transaction structuring. Horizon Partners specializes in early-stage investments in technology-related companies in the United States. Mr. Firmage’s professional career includes completing billions of dollars of M&A transactions since co-founding Horizon in 2010. His track record showcases his involvement in sell-side M&A for technology companies and his operational roles at client companies during the financial crisis of 2008-2009. Horizon’s geographical preference includes investments in the United States. Previous investments include TA Associatesâ recapitalization of PDQ.com among others. Specific investment check sizes are not available, and information about partnership and collaboration styles is limited.

Location: San Francisco, CA

Country: United States of America

Investment Regions: EA, EU, NA

Investment Stages: pre-seed, seed

Website:

AI Reasoning: I found a Horizon Partners page showing Mike Firmage advised on the sale of Lemon Squeezy (transaction announced June 20, 2025 and published June 30, 2025). That investment/advisory activity is within 6 months from the reference date, so classify as very-active.

Low Activity – Only known angel investments more than 12 months ago.

Active – Known angel investments between the last 12 and 6 months.

Very Active – Known angel investments in the last 6 months.