Series B Cybersecurity companies in New York

Companies defending or attacking software, networks, and cloud infrastructure. Filtered to Series B-stage companies headquartered in New York.

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Ranked by current headcount across Series B Cybersecurity companies in New York. Refreshed monthly.

1
AppViewX· New York, New York, United States
AppViewX is trusted by the world’s leading enterprises to prevent outages, reduce risk, and ensure compliance through automated Certificate Lifecycle Management (CLM) and PKI solutions. Our platform delivers end-to-end visibility, automation, and policy control while enabling crypto-agility. Today, mid-size enterprises to Fortune 500 companies—including 6 of the top 10 global banks and 5 of the top 10 healthcare providers—rely on AppViewX as the foundation for their digital trust.
- Series B
- 562 employees
- Founded 2008
2
Adaptive Security· Howard Beach, New York, United States
Adaptive is the human security platform for the AI era.AI has fundamentally changed the threat landscape. Deepfakes make social engineering more convincing, AI-generated phishing makes sophisticated attacks easier to scale, and the rapid adoption of AI tools and agents introduces entirely new risks inside the organization.Adaptive brings together security awareness training, phishing simulations, agentic email security, and AI governance to secure every attack surface where work happens. The platform trains employees against emerging threats, stops sophisticated attacks in the inbox, and secures risky AI and agent usage. Every product works together, combining signals across employees, email, browsers, and devices to continuously understand and reduce human risk.More than 1,000 leading organizations trust Adaptive, rating it 4.9/5 on G2 and Gartner with an NPS of 94. Recognized by Fortune and Fast Company and featured in CNN, BBC, WSJ, Politico, and Variety, Adaptive has raised over $100M from investors including OpenAI and NVIDIA.
- Series B
- 292 employees
- Founded 2024
3
OX Security· New York, New York, United States
OX Security removes risk at the source - eliminating exposures from AI code generation through cloud runtime - preventing security debt before it ever reaches production. Unlike conventional tools that cannot keep pace with modern, AI-driven development, or cloud-specific solutions that are infrastructure-only, the OX Platform pinpoints vulnerabilities at creation and remediates runtime exposures at the source.
- Series B
- 214 employees
- Founded 2021
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4
CertiK· New York, New York, United States
CertiK is the largest Web3 security services provider, founded in December 2017 in New York by two professors from Yale and Columbia University.CertiK offers a wide range of products and services to support the Web3 industry, project teams, and users alike. CertiK's products and services span the entire lifecycle of project development, from incubation and early stages, to growth and maturity. CertiK is one of the most globally recognized companies in the Web3 industry, serving users across 150 countries/regions.To date, CertiK has worked with more than 5,000 enterprise clients, secured over $600 billion worth of digital assets, and detected more than 180,000 vulnerabilities in blockchain code. CertiK's clients include industry-leading projects such as Aptos, Ripple, Sandbox, Polygon, BNB Chain, and TON.Since its inception, CertiK has secured investments from 12 top-tier funds, including Sequoia, Coatue, Goldman Sachs, Shunwei Capital and Insight Partners, with a valuation of more than $2 billion. With a highly skilled technical team, CertiK stands out for its expertise in formal verification technology, artificial intelligence, and academia. CertiK's leaders also collaborate closely with global government bodies to develop supportive Web3 compliance and regulatory frameworks.
- Series B
- 209 employees
- Founded 2018
5
Sentra· New York, New York, United States
Sentra is the AI Data Readiness and Data Security Posture Management (DSPM) platform for the enterprise.Organizations are deploying AI agents, Copilots, and LLM pipelines faster than they're governing the data underneath them. Sentra fixes that. We discover, classify, and secure the sensitive data across your entire data estate - cloud, SaaS, and on-premises - so AI systems only reach what they're supposed to reach.What we do: - Continuous data discovery and classification across AWS, Azure, GCP, Salesforce, Databricks, Snowflake, and more - 98% classification accuracy, context-aware and without custom rules - AI data governance: know what your Copilot, agents, and RAG pipelines can access before go-live - Least privilege enforcement at the data layer to reduce breach blast radius - Agentless, in-environment scanning; no data ever leaves your environment - Compliance-ready posture for GDPR, HIPAA, CCPA, PCI, EU AI Act, and moreWho we work with: CISOs, security engineers, data privacy officers, and cloud architects at enterprises who can't afford to find out what their AI can see after the fact.Real findings in week one. No tuning. Petabyte scale.🌐 sentra.io
- Series B
- 205 employees
- Founded 2021

6
Oasis Security· New York, New York, United States
Oasis is the market leading platform for non-human identity management. Our mission is to fortify cybersecurity defenses by enabling enterprises to efficiently secure non-human identities throughout their lifecycle. The shift to hybrid multi-cloud, microservices, agile development and AI-driven business process automation has led to the exponential growth of non-human identities, completely changing the identity fabric of enterprise environments. We created the first enterprise platform purpose-built to address the security and operational challenges of Non-human Identities. Our platform empowers security, engineering and developers teams to improve security posture, implement stronger governance and simplify compliance by taking control of the non-human identity lifecycle without risking system resilience and without operational complexity.
- Series B
- 179 employees
- Founded 2022
7
Noma· New York, New York, United States
Noma Security is the agentic AI security platform giving enterprise organizations the confidence to rapidly build AI applications and adopt AI agents at scale. Noma Security uniquely provides cybersecurity teams with control of AI risk through continuous AI discovery and inventory, AI supply chain security, AI red teaming, and AI runtime protection to ensure compliance and risk mitigation. Backed by Ballistic Ventures, Glilot Capital, Cyber Club London, Databricks Ventures and SVCI, Noma Security is widely adopted by Fortune 500 customers and has been recognized by Gartner as a leading AI TRiSM solution.
- Series B
- 163 employees
- Founded 2023
8
Blockaid· New York, New York, United States
Blockaid is the onchain security platform trusted by chains, protocols, wallets, exchanges, banks, and digital asset managers to understand and secure what matters most. Our platform provides unmatched visibility from direct integrations with the most used web3 wallets, plus internet-wide monitoring that detects threats before they reach users.Not only does this give us the most comprehensive coverage of any security provider, but the more pre-transaction, onchain, offchain, and threat intelligence data our system sees, the more our models improve. This flywheel effect has made us the platform of choice for industry leaders like Coinbase, Kraken, MetaMask, Uniswap, World App, and Stellar—as well as traditional institutions and fintechs.
- Series B
- 147 employees
- Founded 2022
9
Apiiro· New York, New York, United States
Apiiro Guardian Agent is the control plane for Agentic Development Security. It secures agentic development with a Data Fabric that generates proprietary software architecture graph and risk intelligence graph.AI coding agents generate 5x more code and introduce 10x more risk, while offensive agents discover and exploit vulnerabilities 20x faster. Legacy AppSec was not built for this new reality. This is the perfect storm that Apiiro solves.Apiiro Guardian Agent prevents vulnerable and non-compliant code before it exists, protects coding agents from attacks, AutoFixes the backlog, and consolidates AppSec into a single control plane.Fortune 500 companies including Walmart, USAA, CVS, BlackRock, Bloomberg, TIAA, SoFi, and Shell rely on Apiiro to discover, prioritize, prevent, and AutoFix application risk at scale, from code to runtime.Learn more at https://apiiro.ai
- Series B
- 132 employees
- Founded 2019
10
Linx Security· New York, New York, United States
The Linx Identity Security platform enables identity, security, and IT ops teams to finally control the whole identity lifecycle. A radical departure from legacy identity security solutions, Linx untangles the complex, ever-evolving web of identity security. Integrating smoothly with your IAM stack, Linx pulls together all your organization’s identity data—organizing it neatly to reveal the hidden links between your employees, their digital identities, and the apps, software, platforms, and programs they have access to. Enabling you to continuously reduce your identity attack surface and swiftly close gaps in compliance.
- Series B
- 111 employees
- Founded 2023

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Find engineers at Series B Cybersecurity companies in New York

Searching for “engineers at top Series B Cybersecurity companies in New York” surfaces this slice of the market. The list above ranks Cybersecurity companies headquartered in New York whose latest disclosed round is Series B, by current headcount, drawn from public LinkedIn and Crunchbase records. With 24 matching companies in Refolk’s index, this is a tight read on where the Cybersecurity talent in New York is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series B, Cybersecurity, in New York - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Cybersecurity’s next operators and angel investors.

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Refolk pulled Cybersecurity companies headquartered in New York whose latest disclosed funding round is Series B from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes monthly.

Last refreshed: Thu, 29 Oct 2026 12:32:55 GMT

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