Tosa Partners

Tosa Partners specializes in supporting U.S. early-stage cybersecurity startups successfully expand into the Japanese market with hands-on expertise in sales, channel and strategic partner development, sales promotion and market awareness, high-performing team building, and Go-to-Market strategy execution.

Japan GTM Services – Hands-On Execution

• Business Development & Strategic Partnerships – Driving channel partner development, alliances, and relationship management
• Customer Acquisition & Account Growth – Building new business opportunities and expanding existing customer accounts
• Sales Promotion & Market Awareness – Executing digital, local events, and sales campaigns to generate leads and brand visibility
• Pre-Sales & PoC Support – Providing pre-sales PoC guidance and leading customers through successful PoC engagements
• Team Leadership & Country Management – Building, mentoring, and leading local teams to grow Japan operations

Industry Expertise

• Cybersecurity, XDR, CNAPP
• IDaaS, IAM, AI TRiSM
• Agentic AI, Generative AI
• SaaS

Mak Fukumi / Senior Consultant

With over 20 years of experience in the IT and cybersecurity industry, he brings specialized expertise in the Japanese market. He served as Country Manager for Japan at both Stellar Cyber and OneLogin, where he built their Japan businesses from the ground up by developing strategic local partnerships. He holds an M.S. in Computer Science from the University of Pennsylvania and an MBA from the University of Southern California. His LinkedIn profile is available here.

Taka Yamagami / Emeritus Advisor

With over 30 years of experience across the IT and venture capital industries, he has built a distinguished career spanning both corporate and investment roles. He served as a U.S. office representative for a major Japanese enterprise and as a Managing Director at a venture capital firm, where he successfully led and invested in numerous startup companies. He holds a Master of Science in Management from the Massachusetts Institute of Technology (MIT).