# Tau Ventures' AI Investments: 22 Startups in Its Portfolio (2026) > The 22 AI startups Tau Ventures has backed, by stage: $1.0B raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/tau-ventures-ai-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Pre-seed and seed 10 - [Ghost Security](https://millionrounds.com/company/ghost-security) - [Altitude](https://millionrounds.com/company/altitude) - [Causely](https://millionrounds.com/company/causely) - [CalmWave](https://millionrounds.com/company/calmwave) - [Fourier Health](https://millionrounds.com/company/fourier-health) - [Eve Security](https://millionrounds.com/company/eve-security) - [Kairon Health](https://millionrounds.com/company/kairon-health) - [Trustible](https://millionrounds.com/company/trustible) - [Ensis](https://millionrounds.com/company/ensis) - [Revisto](https://millionrounds.com/company/revisto) ## Stage not reported 4 - [Vecna Robotics](https://millionrounds.com/company/vecna-robotics) - [Olli Health](https://millionrounds.com/company/olli-health) - [Banjo Health](https://millionrounds.com/company/banjo-health) - [6d bytes](https://millionrounds.com/company/6d-bytes) ## Series A 3 - [Passage](https://millionrounds.com/company/passage) - [Autonomize AI](https://millionrounds.com/company/autonomize-ai) - [Oath Surgical](https://millionrounds.com/company/oath-surgical) ## Series C and later 3 - [Assort Health](https://millionrounds.com/company/assort-health) - [Iterative Health](https://millionrounds.com/company/iterative-health) - [Labelbox](https://millionrounds.com/company/labelbox) ## Series B 2 - [Alaffia Health](https://millionrounds.com/company/alaffia-health) - [Elemental Machines](https://millionrounds.com/company/elemental-machines) ## Segment by segment ### Pre-seed and seed 10 startups · $85M raised - [**Ghost Security**](https://millionrounds.com/company/ghost-security) Ghost Security provides the standard in application security for modern enterprises. United States $20M - [**Altitude**](https://millionrounds.com/company/altitude) Altitude is a decentralized finance company that offers an automated borrowing protocol for cryptocurrency users. United States $11M - [**Causely**](https://millionrounds.com/company/causely) Causely is a New York-based software company founded in 2022, specializing in autonomous service reliability for cloud-native applications. United States $11M - [**CalmWave**](https://millionrounds.com/company/calmwave) CalmWave is a Seattle-based healthcare software company founded in 2022. United States $9.7M - [**Fourier Health**](https://millionrounds.com/company/fourier-health) Fourier Health is a healthtech startup founded in late 2023 by James Lloyd and Christopher Lee, based in New York, NY. United States $8.4M - [**Eve Security**](https://millionrounds.com/company/eve-security) Eve Security is a cybersecurity company based in Austin, specializing in the protection of agentic AI systems, particularly autono United States $7.5M - [**Kairon Health**](https://millionrounds.com/company/kairon-health) Kairon Health is a private healthcare technology company founded in 2024 and based in New York, NY. United States $5.0M - [**Trustible**](https://millionrounds.com/company/trustible) Trustible is a private, AI-native Public Benefit Corporation founded in 2023 and based in Arlington, Virginia. United States $4.6M ### Stage not reported 4 startups · $58M raised - [**Vecna Robotics**](https://millionrounds.com/company/vecna-robotics) Vecna Robotics, Inc. United States $46M - [**Olli Health**](https://millionrounds.com/company/olli-health) Olli Health is a private healthtech company based in Madison/Monona, Wisconsin, founded in 2023. United States $10M - [**Banjo Health**](https://millionrounds.com/company/banjo-health) Banjo Health is a healthcare technology company based in Washington, D.C., founded in 2019. United States $2.0M - [**6d bytes**](https://millionrounds.com/company/6d-bytes) 6d bytes is a robotics startup that builds robotics systems to revolutionize the way of preparing and serving meals. United States $518K ### Series A 3 startups · $93M raised - [**Passage**](https://millionrounds.com/company/passage) Passage is a modern identity for web and mobile applications. Canada $41M - [**Autonomize AI**](https://millionrounds.com/company/autonomize-ai) Autonomize AI is a healthcare artificial intelligence company based in Austin, Texas, founded in 2022. United States $28M - [**Oath Surgical**](https://millionrounds.com/company/oath-surgical) Oath Surgical is a health technology startup founded in 2024 by Dr. United States $24M ### Series C and later 3 startups · $697M raised - [**Assort Health**](https://millionrounds.com/company/assort-health) Assort Health is a healthcare technology company based in San Francisco, California, founded in 2023 by Jeffery Liu and Jonathan Wang. United States $246M - [**Iterative Health**](https://millionrounds.com/company/iterative-health) Iterative Health is a healthcare technology and services company based in Cambridge, Massachusetts, with an additional office in N United States $227M - [**Labelbox**](https://millionrounds.com/company/labelbox) Labelbox is a data-centric AI company based in San Francisco, founded in 2018. United States $224M ### Series B 2 startups · $102M raised - [**Alaffia Health**](https://millionrounds.com/company/alaffia-health) Alaffia Health is a healthtech company based in New York, founded in 2020. United States $55M - [**Elemental Machines**](https://millionrounds.com/company/elemental-machines) Elemental Machines is a technology company based in Cambridge, Massachusetts, focused on developing cloud-based hardware and IoT s United States $47M **How this map is made.** Every startup here works in AI and has raised money in a round we track that names Tau Ventures as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Portfolio map **Tau Ventures portfolio map** 33 startups · $1.2B](https://millionrounds.com/portfolio-maps/tau-ventures-portfolio-map)[Sector portfolio **Techstars' AI portfolio** 336 startups · $4.9B](https://millionrounds.com/portfolio-maps/techstars-ai-portfolio)[Sector portfolio **Alumni Ventures' AI portfolio** 302 startups · $36B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-ai-portfolio)[Sector portfolio **Andreessen Horowitz's AI portfolio** 259 startups · $426B](https://millionrounds.com/portfolio-maps/andreessen-horowitz-ai-portfolio)[Sector portfolio **General Catalyst's AI portfolio** 226 startups · $179B](https://millionrounds.com/portfolio-maps/general-catalyst-ai-portfolio)[Sector portfolio **Sequoia Capital's AI portfolio** 209 startups · $543B](https://millionrounds.com/portfolio-maps/sequoia-capital-ai-portfolio) ## Raising from investors like Tau Ventures? Find the investors who back startups like yours, with their cheques, rounds and partners, in the app with filters, lists and exports. [Find investors](https://millionrounds.com/login?join=1&next=/app/investors)[Market maps](https://millionrounds.com/market-maps)