Seed Cybersecurity companies in San Francisco

Magnitude provides the world's first autonomous AI workforce to empower TPRM teams, built to defend against Mythos-scale attacks. Its AI risk analysts continuously assess vendors, products, and govern AI agents across your entire supply chain - from direct relationships to Nth-party dependencies - delivering high-confidence risk decisions and remediations using enterprise-specific reasoning that improves over time. Because autonomous offense now operates at machine scale, Magnitude replaces the entire static TPRM model with an autonomous governance and defense system for all external dependencies.

• Seed
• 24 employees
• Founded 2024

Seezo helps security teams scale security design reviews without adding headcount or disrupting developer workflows.Manual security design reviews don’t scale. Coverage becomes selective, feedback arrives too late, and design risk surfaces in code, audits, or production.Seezo fixes this by delivering high-signal, contextual, customized, and explainable security guidance at the design stage.We analyze real design inputs, PRDs, architecture docs, diagrams, and tickets to generate customized security requirements mapped to your internal standards and compliance needs (PCI, HIPAA, FDA, SOC 2, and more). Every requirement includes clear reasoning, so teams understand what matters, why it matters, and what can wait.Seezo is built to work where engineering already operates:•Workflow-native: Works directly inside the documentation, diagrams, tickets, and tools your teams already use.•Contextual & customizable: Tailors security guidance to your internal policies, risk tolerance, threat models, and compliance requirements.•Explainable by design: AppSec-trained decision trees guide the analysis, producing precise yes/no outcomes instead of opaque AI output•Scalable: Consistent quality across every system and teamBuilt by former security leaders from Razorpay and Synopsys, security teams use Seezo to move from selective spot checks to 100% design-stage coverage and make confident security decisions at scale.

• Seed
• 23 employees
• Founded 2023

Iden is the first complete identity governance platform for your entire software stack. Coverage has been the most fundamental unsolved problem in identity and we're here to fix that. We're quietly building the future of identity with some of world's most forward-thinking companies across industries, from factory floors to crypto exchanges. We operate globally across SF, LA, Barcelona and Bangalore.Backed by Accel.

• Seed
• 23 employees
• Founded 2024

AIBound is the Control Plane for High-Risk AI.We help enterprise security teams detect Shadow AI, map the identities and sensitive systems behind it, score risk from A–F, and prevent High-Risk AI before it exposes data or creates compliance risk.As AI adoption spreads across every department, most organizations do not have a clear view of which AI tools, assistants, agents, apps, extensions, and MCP servers are already in use — or what those tools can access.AIBound gives security, risk, privacy, and compliance teams the visibility and control needed to secure AI adoption across browser, endpoint, network, and cloud environments.Our platform helps teams:Discover Shadow AI across the organizationMap Agentic Identities and connected systemsIdentify sensitive data exposureScore AI risk from A–FDetect unsafe app usage and policy violationsPrevent High-Risk AI in real timeSupport EU AI Act and NIST AI RMF readinessBuilt by security practitioners, for security practitioners, AIBound helps enterprises move beyond Shadow AI discovery and into real-time High-Risk AI prevention.Book a 30-minute demo and we'll map the Shadow and High Risk AI already inside your business in less than 24 hours

• Seed
• 23 employees

Archipelo is the DevSPM platform powered by Salmon, providing verifiable attribution across developers, AI agents, tools, and software delivery workflows. Security teams can see who did what, when, and how before code reaches production, creating a trusted system of record for modern software development.

• Seed
• 18 employees
• Founded 2020