# Index Ventures' Cybersecurity Investments: 18 Startups in Its Portfolio (2026) > The 18 Cybersecurity startups Index Ventures has backed, by stage: $1.7B raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/index-ventures-cybersecurity-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Series C and later 8 - [Lookout](https://millionrounds.com/company/lookout) - [Clumio](https://millionrounds.com/company/clumio) - [Sublime Security](https://millionrounds.com/company/sublime-security) - [Tines](https://millionrounds.com/company/tines) - [Expel](https://millionrounds.com/company/expel) - [Mimecast](https://millionrounds.com/company/mimecast) - [AttackIQ](https://millionrounds.com/company/attackiq) - [Signal Sciences](https://millionrounds.com/company/signal-sciences) ## Series B 4 - [Linx Security](https://millionrounds.com/company/linx-security) - [CipherCloud](https://millionrounds.com/company/ciphercloud) - [Brinc Drones](https://millionrounds.com/company/brinc-drones) - [Evervault](https://millionrounds.com/company/evervault) ## Stage not reported 4 - [Duo Security](https://millionrounds.com/company/duo-security) - [Dazz](https://millionrounds.com/company/dazz) - [Coalition](https://millionrounds.com/company/coalition) - [*N* Notion](https://millionrounds.com/company/notion) ## Series A 2 - [*SC* [Stealth Cybersecurity Startup]](https://millionrounds.com/company/stealth-cybersecurity-startup) - [*D* Duna](https://millionrounds.com/company/duna) ## Segment by segment ### Series C and later 8 startups · $1.1B raised - [**Lookout**](https://millionrounds.com/company/lookout) Lookout, Inc. United States $282M - [**Clumio**](https://millionrounds.com/company/clumio) Clumio is a cloud-native backup-as-a-service company based in Santa Clara, California. United States $261M - [**Sublime Security**](https://millionrounds.com/company/sublime-security) Sublime Security is an adaptive, AI-powered cloud email security platform founded in 2019 in Washington, DC. United States $150M - [**Tines**](https://millionrounds.com/company/tines) Tines is a no-code security automation and intelligent workflow platform founded in 2018 in Dublin, Ireland. Ireland $140M - [**Expel**](https://millionrounds.com/company/expel) Expel is a leading Managed Detection and Response (MDR) provider based in Herndon, Virginia. Vatican City $99M - [**Mimecast**](https://millionrounds.com/company/mimecast) Mimecast is a SaaS-based email management platform enabling companies to administer business communications and data. United Kingdom $90M - [**AttackIQ**](https://millionrounds.com/company/attackiq) AttackIQ® is trusted by top organizations worldwide to validate security controls in real time. United States $70M - [**Signal Sciences**](https://millionrounds.com/company/signal-sciences) Signal Sciences is a cloud-based web application security company based in Culver City, California. United States $52M ### Series B 4 startups · $266M raised - [**Linx Security**](https://millionrounds.com/company/linx-security) Linx Security is a privately held cybersecurity company founded in 2023 and based in New York, New York. United States $83M - [**CipherCloud**](https://millionrounds.com/company/ciphercloud) CipherCloud is a cloud security company that provides a platform that delivers data protection, compliance, and control. United States $80M - [**Brinc Drones**](https://millionrounds.com/company/brinc-drones) BRINC Drones is an American technology company based in Seattle, founded in 2017 and incorporated in 2019. United States $75M - [**Evervault**](https://millionrounds.com/company/evervault) Evervault is a Dublin-based cybersecurity and data infrastructure company founded in 2019. United States $28M ### Stage not reported 4 startups · $223M raised - [**Duo Security**](https://millionrounds.com/company/duo-security) Duo Security is a software company that provides network security software products and services. United States $120M - [**Dazz**](https://millionrounds.com/company/dazz) Dazz delivers unified security remediation across code, clouds, infrastructure, and applications for security and development teams. United States $50M - [**Coalition**](https://millionrounds.com/company/coalition) CO.ALITIONTM is a Colorado based company that designs some of the most elegant, functional and timeless urban packs around and the United States $40M - [*N* **Notion**](https://millionrounds.com/company/notion) United States $13M ### Series A 2 startups · $91M raised - [*SC* **[Stealth Cybersecurity Startup]**](https://millionrounds.com/company/stealth-cybersecurity-startup) - $55M - [*D* **Duna**](https://millionrounds.com/company/duna) - $36M **How this map is made.** Every startup here works in Cybersecurity and has raised money in a round we track that names Index 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) [Sector portfolio **Index Ventures' AI portfolio** 126 startups · $49B](https://millionrounds.com/portfolio-maps/index-ventures-ai-portfolio)[Sector portfolio **Index Ventures' Fintech portfolio** 46 startups · $11B](https://millionrounds.com/portfolio-maps/index-ventures-fintech-portfolio)[Sector portfolio **Index Ventures' IT Services portfolio** 37 startups · $871M](https://millionrounds.com/portfolio-maps/index-ventures-it-services-portfolio)[Sector portfolio **Index Ventures' Software portfolio** 25 startups · $2.0B](https://millionrounds.com/portfolio-maps/index-ventures-software-portfolio)[Sector portfolio **Index Ventures' Internet portfolio** 21 startups · $3.3B](https://millionrounds.com/portfolio-maps/index-ventures-internet-portfolio)[Sector portfolio **Index Ventures' Big Data & Analytics portfolio** 21 startups · $1.6B](https://millionrounds.com/portfolio-maps/index-ventures-big-data-analytics-portfolio) ## Raising from investors like Index 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)