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.

$50,000,000 Amount

Investors

  • 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.

  • StepStone Group

    StepStone Group (Nasdaq: STEP) is a global private markets investment firm focused on providing customized investment solutions and advisory and data services to our clients. StepStone’s clients include some of the world’s largest public and private defined benefit and defined contribution pension funds, sovereign wealth funds, and insurance companies, as well as prominent endowments, foundations, family offices, and private wealth clients, which include high-net-worth and mass affluent individu

  • CRV

    CRV is an early-stage venture capital firm founded in 1970 that leads seed and series A rounds. The firm has backed over 750 companies early in their development, including DoorDash, Mercury, and Vercel.

  • 01 Advisors

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

  • Fika Ventures

    Fika Ventures is a venture capital firm that invests in early-stage B2B startups in software, fintech, and marketplaces. The firm has raised multiple funds including a $160M Fund IV and has portfolio companies that have achieved acquisitions and significant funding rounds.

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