John J Mack

John J Mack covers 7 companies with a founder-verified check from John J Mack, concentrated in SaaS, Climate. Round sizes are not disclosed for these companies, so this report lists the verified positions rather than dollar totals.

• Verified portfolio companies: 7
• Sector mix: SaaS 1 · Climate 1
• Headquarters mix: New York 2 · Chevy Chase 1 · Santa Clara 1

John J Mack — verified positions

• Fortify
• Harmonic Growth Partners
• The Vantive Corporation
• Covalent
• Star Mountain Capital
• LendingClub
• New Fortress Energy

John J. Mack — related firms and companies (43)

• Credijusto
• John J. Mack portfolio companies 2026
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