# Adaptive Security funding: rounds and investors > Adaptive Security has raised $124M across 2 rounds since 2025. Investors include Andreessen Horowitz, OpenAI and Citibank. Every round with its source. Source: https://millionrounds.com/company/adaptive-security (Millionrounds; every figure on the page links to its filing or article) United States · [Series B startup](https://millionrounds.com/companies) # Who invested in *Adaptive Security* 2 rounds we have observed, with the 7 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. AI Cybersecurity Raised 11 months ago Follow Adaptive Security and see its new rounds in your feed. [Start following](https://millionrounds.com/login?join=1&why=follow&next=%2Fcompany%2Fadaptive-security) Funding summary Updated 5 Nov 2026 **$124M** raised across 2 rounds since 2025, from 2 sources **$43M** Series A **$81M** Series B - **Latest round:** Series B, $81M Dec 2025 - **Step-up i:** 1.9× - **Investors:** 7 (2 led) See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2026 **$43M** Series A **$81M** Series B - **First round:** Series A, $43M - **Biggest round:** $81M - **Between rounds:** 8 months ## The rounds - **Dec 2025** Series B **$81M** *5 new* *1 returning* [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) [Citibank](https://millionrounds.com/fund/citi) [Bain Capital Ventures](https://millionrounds.com/fund/bain-capital-ventures) [Abstract Ventures](https://millionrounds.com/fund/abstract) [Eniac Ventures](https://millionrounds.com/fund/eniac-ventures) [nVentures](https://millionrounds.com/fund/nventures-2) Source recorded - **Apr 2025** Series A **$43M** *2 new* [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) Lead [OpenAI](https://millionrounds.com/fund/openai) Lead Reported by TechCrunch ## Who was in which round The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led. **Series A** 2025 **Series B** 2025 [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) L [OpenAI](https://millionrounds.com/fund/openai) L [Citibank](https://millionrounds.com/fund/citi) [Bain Capital Ventures](https://millionrounds.com/fund/bain-capital-ventures) [Abstract Ventures](https://millionrounds.com/fund/abstract) [Eniac Ventures](https://millionrounds.com/fund/eniac-ventures) [nVentures](https://millionrounds.com/fund/nventures-2) ## Everyone who backed them [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) VC firm **2** rounds, led 1 [OpenAI](https://millionrounds.com/fund/openai) VC firm **1** round, led 1 [Citibank](https://millionrounds.com/fund/citi) Growth equity **1** round [Bain Capital Ventures](https://millionrounds.com/fund/bain-capital-ventures) VC firm **1** round [Abstract Ventures](https://millionrounds.com/fund/abstract) VC firm **1** round [Eniac Ventures](https://millionrounds.com/fund/eniac-ventures) VC firm **1** round [nVentures](https://millionrounds.com/fund/nventures-2) VC firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=adaptive-security). ## Also claim to have backed them These 2 firms list Adaptive Security as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above. [K5 Global](https://millionrounds.com/fund/k5-global) Private equity Per its own site [Parable](https://millionrounds.com/fund/parable) VC firm Per its own site ## Quick answers about Adaptive Security ### Who invested in Adaptive Security? Adaptive Security's investors include Andreessen Horowitz, OpenAI, Citibank, Bain Capital Ventures and Abstract Ventures, and 2 more on record. ### How much has Adaptive Security raised? Adaptive Security has raised $124M across 2 rounds since 2025. ### When did Adaptive Security last raise? Adaptive Security's most recent round was a Series B of $81M in Dec 2025. ### What was Adaptive Security's biggest round? Its most recent round, $81M in Dec 2025, is also its largest on record. ### Who backed Adaptive Security first? Adaptive Security's first round on record, in Apr 2025, was backed by Andreessen Horowitz and OpenAI. ### What stage is Adaptive Security at? Adaptive Security's latest named round is a Series B, in Dec 2025. ### Where is Adaptive Security based? Adaptive Security is based in the United States. ### Who led Adaptive Security's rounds? Andreessen Horowitz led the Series A in 2025. ## Companies like Adaptive Security In the same sector, and raised in the last eighteen months. 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