Octopus Ventures is one of Europe's largest early-stage venture investors, based in London with over £1.7 billion under management and deploying over £200 million annually. The firm invests across Health, Fintech, Deep Tech, Climate, B2B Software, and Consumer sectors. In neurotech and mental health, Octopus has backed Big Health (digital therapeutics for insomnia and anxiety, used by NHS) and co-led the Series A round for CoMind (non-invasive optical brain monitoring technology). Octopus has published research on mental health technology investment trends and considers brain health a key area within its Future of Health strategy. The firm invests from seed through Series B, typically writing £1M–£10M checks.