Rain Capital

Rain Capital is a venture capital firm based in San Francisco, California, founded in 2017. The firm specializes in making direct investments in early and late-stage companies, primarily focusing on transformative technologies within the cybersecurity, artificial intelligence, and analytics sectors. Rain Capital is particularly dedicated to supporting the next generation of women entrepreneurs, reflecting its commitment to diversity and inclusion in the tech industry. The firm aims to identify and invest in innovative companies that are poised to drive change and growth, primarily targeting investments within California.

Charisee Castagnoli

Venture Partner

Jamie Lewis

Venture Partner

Chenxi Wang

Managing General Partner

18 past transactions

SplxAI

Seed Round in 2025
SplxAI is a cybersecurity company specializing in automated security testing for AI chatbots, ensuring they remain safe from manipulation and data breaches. The platform continuously monitors and tests chatbots for vulnerabilities such as prompt injection, context leakage, social engineering, and other advanced threats. Key features include real-time detection and mitigation strategies, multimodal pentesting capabilities (covering text, audio, and video), and comprehensive reporting tools that provide actionable insights for improving security. SplxAI's solution integrates seamlessly with existing security frameworks and platforms, making it easy to deploy and manage. By providing robust protection against a wide range of threats, SplxAI helps enterprises safeguard their AI-driven applications, maintain data integrity, and ensure compliance with industry standards. The company is committed to innovation, continuously enhancing its product to address emerging threats in the rapidly evolving AI landscape. SplxAI is trusted by forward-thinking organizations looking to proactively secure their AI assets and protect sensitive information.

Tuskira

Series A in 2024
Tuskira's Agentic AI Security Mesh integrates data from over 150 tools, streamlining operations and enhancing existing defenses. This unified approach empowers security teams to transition from reactive measures to proactive strategies, ensuring continuous protection against evolving cyber threats.

Simbian

Seed Round in 2024
Simbian integrates secure and intelligent AI solutions into corporate processes across varied IT environments to maximise security coverage and speed up resolutions to security teams.

Ox Security

Seed Round in 2022
Ox Security is a company that provides a comprehensive security platform aimed at protecting the software supply chain from vulnerabilities. Its solution offers real-time, end-to-end visibility into various elements that influence software security throughout the development pipeline. This visibility enables DevOps teams to monitor the entire software supply chain attack surface, including source code, pipeline, artifacts, container images, runtime assets, and applications. By focusing on the complexities of modern software development, Ox Security seeks to prevent attacks and enhance the overall security of software systems.

Permiso Security

Seed Round in 2022
Permiso Security delivers an identity-based cloud detection and response solution for cloud infrastructures. Permiso simplifies cloud security so that technology and security professionals can protect the cloud like a pro. Permiso's solution matches key events to key identities, allowing clients to see who is doing what with a quick alert in plain English and a response plan.

Living Security

Series B in 2021
Living Security, Inc., based in Austin, Texas, specializes in cybersecurity awareness solutions aimed at empowering employees within enterprises to mitigate cyber risks. Founded in 2017, the company offers innovative training programs such as the Cyber Escape Room, which allows employees to engage in immersive experiences while learning about cybersecurity. These programs are designed to enhance security awareness and provide insights into organizational vulnerabilities through analytics and reporting. By focusing on human risk factors and promoting an interactive learning environment, Living Security aims to foster lasting behavioral changes that reduce the likelihood of cybersecurity breaches in the workplace.

JupiterOne

Series A in 2020
JupiterOne, Inc. develops cloud-based cybersecurity asset management and automation software aimed at enhancing security and compliance for organizations. The company's flagship product provides chief information security officers, security operations teams, and compliance officers with tools to automate the discovery, visibility, and management of cyber assets across cloud environments. This includes functionalities for risk analysis, compliance reporting, vulnerability management, threat hunting, and incident response. Additionally, the JupiterOne Insights application allows users to create customized reporting dashboards and visualizations for monitoring code activities and security postures. Founded in 2018 and headquartered in Morrisville, North Carolina, JupiterOne operates additional offices in Charlotte, Salt Lake City, and Seattle. The company is a subsidiary of LifeOmic Security, LLC and is focused on simplifying cloud security management for organizations, replacing guesswork with comprehensive data about assets and configurations.

Mitiga

Seed Round in 2020
Mitiga, Ltd is a company based in Tel Aviv-Yafo, Israel, specializing in hybrid managed security services for cloud environments. It offers a comprehensive SaaS and cloud threat detection solution that addresses the unique security challenges faced by modern businesses. Mitiga's services include incident response, breach readiness, and emergency assistance, enabling organizations to detect, investigate, and respond to threats effectively. Utilizing advanced technology, the company provides automated investigative pathways within networks to streamline preliminary work during incidents, thereby enhancing breach readiness and reducing response times. Additionally, Mitiga assists businesses in modeling and quantifying potential losses from various catastrophic events using artificial intelligence and high-performance computing.

Living Security

Series A in 2020
Living Security, Inc., based in Austin, Texas, specializes in cybersecurity awareness solutions aimed at empowering employees within enterprises to mitigate cyber risks. Founded in 2017, the company offers innovative training programs such as the Cyber Escape Room, which allows employees to engage in immersive experiences while learning about cybersecurity. These programs are designed to enhance security awareness and provide insights into organizational vulnerabilities through analytics and reporting. By focusing on human risk factors and promoting an interactive learning environment, Living Security aims to foster lasting behavioral changes that reduce the likelihood of cybersecurity breaches in the workplace.

Layer 9

Seed Round in 2019
Realtime data observability for microservices

Bolster AI

Series A in 2019
Bolster Inc. is a cybersecurity company that specializes in artificial intelligence and machine learning to combat online fraud and protect brands from scams and account takeovers. Founded in 2017 and headquartered in Los Altos, California, Bolster offers a range of products, including Online Customer Protection, which features detection, automated takedown, continuous monitoring, and threat intelligence. Its Online Fraud Prevention platform identifies both victims and scammers, providing tools to address phishing kits and fraudulent sites. Additionally, the company provides a Real-time Detection API that covers various types of scams, such as phishing and counterfeit activities. Bolster serves multiple sectors, including finance, technology, and retail, and promotes proactive brand protection through tools like checkphish.ai, a free, open-source resource for detecting fraudulent websites and phishing scams. The team at Bolster has extensive experience in cybersecurity, contributing to its innovative approach to fraud prevention.

Tetrate

Series A in 2019
Tetrate.io, Inc. is a company founded in 2017 and based in San Francisco, California, that specializes in application management for hybrid and multi-cloud environments. It offers an enterprise-ready service mesh platform designed to simplify the complexities faced by DevOps, security, and network administrators when managing modern cloud application infrastructures. The platform enables development teams to run and manage microservices efficiently, facilitating the modernization of applications and easing the transition to public cloud adoption for businesses. By partnering with enterprises on their app modernization journeys, Tetrate supports the development and deployment of microservices across various workloads and environments.

Capsule8

Series B in 2018
Capsule8, founded in 2016 and headquartered in New York, specializes in cyber protection for Linux systems across various environments including containerized, virtualized, and bare metal infrastructures. The company's flagship product, Capsule8 Protect, focuses on detecting and mitigating attacks in real-time, offering continuous security for enterprises that rely on Linux. By enabling organizations to safeguard their systems from zero-day attacks and other unwanted activities without the need for human intervention, Capsule8 empowers businesses to modernize their infrastructure securely. Founded by experts in cybersecurity and backed by prominent investors, Capsule8 is committed to enhancing the security posture of Linux-powered enterprises.

Altitude Networks

Seed Round in 2018
Altitude Networks, Inc. is a cloud computing company based in San Francisco, California, founded in 2018. The firm specializes in providing security solutions for cloud collaboration software, including platforms like SharePoint, OneDrive, and Google Drive. Its offerings include a data loss prevention (DLP) application that allows organizations to swiftly identify, remediate, and prevent data loss in the cloud with ease. Altitude Networks focuses on protecting enterprise data by monitoring sensitive materials to prevent unauthorized access and accidental sharing. The software employs automatic file sensitivity classification and identity mapping to detect potential vulnerabilities, including unauthorized access through personal employee accounts. With a user-friendly interface, the solution is suitable for organizations of various sizes, ranging from small companies to large enterprises, ensuring robust protection against data theft and unintentional sharing.
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