Giant Ventures Research
Investment Thesis
Giant Ventures is a purpose-driven venture capital firm founded in 2019 by Cameron McLain and Tommy Stadlen. The firm believes that the biggest companies of the century will be built solving the world's most pressing problems. Giant champions ambitious, technical founders using technology to reshape civilization around three core themes: climate, health, and inclusive capitalism.
The firm's philosophy centers on backing founders solving genuine global challenges while generating strong financial returns. Their prior fund has doubled in value since 2019, ranking in the top quartile of venture capital firms globally.
Investment Focus
Giant invests across three primary themes:
- Climate: Clean energy, carbon removal, sustainable agriculture, circular economy, renewable infrastructure
- Health: Digital health, AI for diagnostics, mental wellness, accessible healthcare, biotech
- Inclusive Capitalism: Education accessibility, economic mobility, financial inclusion, sustainable business practices
Notable successes include the $2 billion mental health app Calm, carbon removal platform Agreena (responsible for regenerative farming adoption across 2 million hectares), energy storage leader Field ($300M+ raised), and Europe's leading virtual hospital ward company Doccla.
Stage Focus
Giant invests across the entire funding spectrum from Pre-Seed to Growth stage:
- Pre-Seed: Early-stage companies with founding team and initial traction
- Seed: Companies with MVP and early customer validation ($2-8M typical)
- Series A/B: Growth-stage companies with product-market fit ($10M+)
- Series B+/Growth: Scale-up capital for leading climate and health companies
The firm launched specific funds to address different stages: a $100M seed fund and a $150M climate-focused growth fund to fill the Series B climate funding gap.
Check Size
Giant's investment size varies by stage and fund:
- Seed Fund: Typically $1-5M
- Growth Fund: $5-15M+ for Series A/B rounds
- Portfolio reserve for follow-ons: 50%+ of fund for existing companies
The firm has demonstrated ability to do larger checks, with portfolio companies like Haven Energy raising $40M+ rounds and Radiant Nuclear raising $165M.
Recent Activity (2025-2026)
Giant has been extremely active in deploying capital:
- December 2025: Invested in Matta Labs (AI agents for battery teams)
- October 2025: Carbon Robotics ($20M), Odys Aviation ($26M VTOL aircraft)
- September 2025: Shield ($5M stablecoins for cross-border payments)
- Summer 2025: Pano AI ($44M Series B), Haven Energy ($40M debt & equity)
- 2025 YTD: 15+ investments across portfolio
Fund Status: Actively deploying capital from two fresh funds totaling $250M announced in early 2024. On track to deploy more than $1 billion into sustainable technology this decade.
Lead Tendency
Giant is a lead investor in many of their rounds but also participates in follow-on rounds and co-invested deals. They combine lead investments with strong follow-on capacity and active portfolio support.
Geographic Focus
Global presence with strong footprint in:
- Europe: London (HQ), Copenhagen, Stockholm, Nordic countries
- US: New York, California/Los Angeles
- Selective: International opportunities aligned with thesis
Team & Expertise
Founders & Leadership
- Cameron McLain (Co-Founder & Managing Partner): Former tech founder and leading angel investor from Hummingbird Ventures. Entrepreneurial DNA and deep founder networks.
- Tommy Stadlen (Co-Founder & General Partner): Former co-founder of Swing (acquired by Microsoft), best-selling sustainability author, worked for President Obama on climate policy.
Partners
- Will Dufton: Former founder (Radian Holdings) and Principal at OMERS Ventures
- Zenetta Burger: Former investor at Anthos, Head of Operations at Community.com
- Madelene Larsson: Former product leader at Revolut, JPMorgan tech banking
- Mohadeseh Abdullahi: Former investor at Molten Ventures, Co-Founder Impact One
Key Team Members
- Lucy Brady: Head of Product, former director at Oscar Health and White House Digital Service
- Georgia Ritter: Head of Marketing & Community
- Rob Hicks: Chief Financial Officer
- Hayden Wood: Venture Partner, former founder & CEO of Bulb
Advisory Board (Premium Tier)
- Lord Browne: Former BP CEO, Founding Partner BeyondNetZero
- David Miliband: CEO International Rescue Committee, former UK Foreign Secretary
- Linda Avey: Co-founder 23andMe
- Tensie Whelan: Director NYU Center for Sustainable Business, former Rainforest Alliance President
Decision Process
Partnership-based decision making with input from co-founders and leadership team. Board members and advisory partners provide strategic guidance. Mix of founder-led instinct and operational rigor. 92% of European VCs have never worked at a startup; Giant's team is differentiated by deep founder experience.
Investment Approach
- In-house venture building: Giant builds companies in-house, not just invests. Successful incubations include Beams (green home renovation with Bulb founder), Meadow (education fintech), Haven (battery storage marketplace), and Baton (SMB acquisition marketplace).
- Founder support: As former founders, the team rolls up sleeves to help portfolio companies win. Deep operational support beyond just capital.
- Founder-founder connections: Strong network effects from founder-led team. Ability to connect founders with portfolio company executives and operators.
Portfolio Highlights
Unicorns & Major Exits
- Calm: $2 billion valuation, mental wellness and sleep app. Major unicorn in portfolio
- Field: $300M+ raised for energy storage
- Radiant Nuclear: $165M Series B, portable nuclear microreactors
- Doccla: Europe's leading virtual hospital ward company
Validation Notes
- Multiple sector classifications across climate, health, and fintech
- 45+ portfolio companies across all investment stages
- Deep team with 20+ named members from founders to operating partners
- Clear investment thesis focused on purpose-driven impact with financial returns
- Active deployment in 2025-2026 with 15+ recent investments
- Global geographic reach with offices in London, New York, Los Angeles, Copenhagen, Stockholm