Siro Series B

Siro raised a $50M Series B in May 2025 from Index Ventures, CRV, SignalFire, 01 Advisors, Fika Ventures and StepStone Group, with angels including Songe LaRon, Dave Salvant and Michael Stoppelman.

Investors

• 01 Advisors

  Venture capital firm with offices in San Francisco and New York City.

• FCRV
• FFika Ventures
• Index Ventures

  International venture capital firm with a New York office investing in technology startups

• SignalFire

  Venture capital firm built like a tech company, using AI-driven tools to back founders in enterprise AI, cybersecurity, fintech and healthcare, with roughly $3 billion under management.

• FStepStone Group

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