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WhiteRabbit Ventures

548 Market St, San Francisco, CA, 94104, United States

Overview

WhiteRabbit is a cybersecurity venture studio founded in 2024 by Nir Polak and Caleb Sima, based in the San Francisco Bay Area.​ It partners with passionate founders to ideate, validate problems, build teams, accelerate growth to customers, and provides a $5M+ initial check, distinguishing itself from traditional VCs by actively building companies from the ground up.

Total investments
2
Lead investments
0
Investments · 12mo
2
Active investors
1
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Investment portfolio

  • Spectrum Security

    Participated · Equity · Apr 2026

    Spectrum Security builds an AI-driven detection platform that operates on top of customers’ existing SIEMs, data lakes, and security tools to continuously map coverage gaps, author production-grade detections tailored to environments, and automatically fix detection logic as infrastructure drifts. The company says its platform reduces detection-authoring time from weeks to minutes, surfaces gaps teams had not found, and cuts manual engineering hours while keeping coverage effective as attack surfaces evolve. Spectrum positions SecOps teams as remaining in control while the platform provides autonomous detection engineering at scale. The team announced the company is emerging from stealth with $19M in funding from a group of operator investors. The announcement did not disclose revenue, user metrics, founding year, location, or specific go-to-market plans.

  • Helmet Security

    Participated · Equity · Dec 2025

    Helmet Security builds an end-to-end security platform designed to safeguard enterprises against emerging threats stemming from agentic AI communications. The system continuously discovers and manages MCP servers, enforcing policy controls that let security leaders spot risky activity, block unsanctioned or over-privileged workflows, and respond immediately to new connections. By centralizing discovery and policy enforcement, the platform aims to reduce the attack surface created by modern AI-driven communications channels. Led by CEO Fred Kneip and CTO Kaushik Shanadi, the company positions itself as a comprehensive solution for enterprises tasked with managing fast-changing AI security risks. With fresh capital, Helmet Security plans to scale its operations and accelerate product development. No operating metrics such as revenue or user counts were disclosed in the fundraising announcement.

Team