As 2025 came to a close, cybersecurity investors showed no signs of slowing down. December delivered a surge of late-stage mega-rounds alongside a healthy pipeline of early-stage bets, signaling continued confidence in platforms tackling identity, cloud security, AI risk, infrastructure resilience, and application protection
From nine-figure Series B and D raises to pre-seed and venture rounds backing the next generation of cyber startups, the final month of the year offered a clear snapshot of where capital and conviction is flowing.
Below is a comprehensive look at the cybersecurity funding announcements from December.
December 2025 Funding Announcements
- Saviynt: Raised $700M in a Series B, marking one of the largest identity security rounds of the year and underscoring sustained demand for enterprise IAM modernization.
- Eon.io: Secured $300M in a Series D, reflecting strong investor appetite for cloud data protection and infrastructure-scale security platforms.
- Fastly: Raised $160M in post-IPO debt financing, reinforcing its balance sheet as edge security and delivery remain mission-critical for global enterprises.
- 7AI: Closed a $130M Series A, signaling aggressive early conviction around AI-driven security capabilities.
- Vega: Announced a $120M Series B, highlighting momentum behind platforms addressing modern threat detection and response.
- Antithesis: Raised $105M in a Series A, one of the largest early-stage rounds this month, pointing to growing interest in software reliability and security testing.
- Axiado Corporation: Secured $100M in a Series C to advance hardware-rooted security for cloud and data center environments.
- Zafran Security: Closed a $60M Series C, continuing investor focus on application and runtime security.
- Act: Raised $40M in a Series A, reflecting confidence in early-stage teams addressing emerging security challenges.
- Echo: Announced a $35M Series A, adding to a strong month for growth-stage startups.
- SpecterOps: Secured $30M in a venture round, expanding its work around adversary-focused security and detection.
- imper.ai: Raised $28M in a funding round, reinforcing momentum around AI-centric security solutions.
- Prime Security: Closed a $20M Series A, highlighting sustained interest in cloud and application protection.
- Kasada: Announced a $19.9M venture round, continuing investment in bot management and fraud prevention.
- Lumia Security: Raised $18M in seed funding, pointing to strong early belief in next-gen security platforms.
- vijil: Secured $17M in a venture round, adding to the growing pipeline of security startups gaining traction.
- Codenotary: Raised $16.5M in a funding round to expand its work around software integrity and trust.
- Multifactor (YC F25): Closed a $15M seed round, reflecting ongoing demand for identity and access security at the earliest stages.
- NetFoundry: Raised $15M in a Series A, supporting secure networking and zero-trust architectures.
- Resemble AI: Announced $13M in strategic funding, emphasizing the security implications of synthetic media and voice AI.
- Equixly API Security” Secured €10M in a Series A, underscoring rising concern around API attack surfaces.
- Dux Security: Raised $9M in seed funding, continuing the steady flow of early-stage cyber investments.
- Helmet Security, Inc.: Closed a $9M seed round, signaling confidence in its approach to modern security challenges.
- Verisoul: Announced a $9M Series A, reflecting traction in digital identity and trust.
- Alinia AI: Raised $7.5M in seed funding, highlighting investor interest in AI-native security startups.
- Saporo: Secured €7M in a Series A, continuing European momentum in cybersecurity funding.
- TestMachine: Announced a $6.5M venture round, focused on security validation and testing.
- Mirror Security: Raised $2.5M in pre-seed funding, backing an early vision for emerging security needs.
- Realm.Security, Inc.: Closed a $2M venture round, rounding out the month with continued support for early-stage innovation.
What December’s Funding Tells Us
December 2025 made one thing clear: cybersecurity remains a top investment priority across stages. Mega-rounds dominated the headlines, but the depth of seed and early venture funding shows a healthy pipeline forming beneath the surface.
As enterprises grapple with AI risk, cloud complexity, identity sprawl, and expanding attack surfaces, investors are betting both on proven platforms ready to scale and on young companies aiming to redefine how security is built and delivered. If December is any indication, 2026 will begin with strong momentum already in motion.