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25madison is a venture studio and investment firm that collaborates with founders to build and scale innovative companies, providing capital, resources, and operational expertise.
25madison is a venture studio and investment firm that partners with entrepreneurs to create and grow innovative businesses from the ground up. 25madison helps founders navigate the early stages of company development, from concept to launch and beyond. The firm leverages its in-house team of experts and extensive network of advisors to provide strategic guidance, technical resources, and market access, ensuring startups have the support they need to succeed. Focused on building high-growth companies across various sectors, 25madison is committed to fostering innovation and driving long-term value creation for its portfolio businesses.

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Battery Ventures, established in 1983, is a global venture capital firm investing in transformative companies across application software, IT infrastructure, consumer-internet, mobile services, and industrial technologies. With headquarters in Boston, Silicon Valley, and Israel, it supports companies from seed to growth stages via a team-based, thesis-driven approach and specialized services.
Fusion Fund, based in Palo Alto, CA, invests in early-stage startups in healthcare, enterprise AI, and industrial tech, focusing on data or technical edge. With expertise in robotics, mobility, connectivity, AI, and digital health, it supports U.S. and Canadian startups from pre-seed to Series A stages, leveraging a strong CXO network for strategic guidance.
Greylock Partners, based in Menlo Park, CA, invests in disruptive consumer and enterprise software sectors, focusing on early-stage companies. Their portfolio includes Airbnb, Facebook, and Roblox. They provide capital, strategic guidance, and industry connections, emphasizing AI, cybersecurity, and fintech, alongside initiatives like the Greylock Edge program for founders.