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 Ph.D

General Partner and Founder

18 past transactions

SplxAI

Seed Round in 2025
SplxAI is a cybersecurity company that specializes in automated security testing for AI chatbots. Its platform continuously monitors and tests chatbots for vulnerabilities, such as prompt injection and context leakage, and provides real-time detection and mitigation strategies. The platform offers multimodal pentesting capabilities, covering text, audio, and video, and generates comprehensive reports with actionable insights. SplxAI's solution integrates seamlessly with existing security frameworks and is trusted by enterprises seeking to proactively secure their AI assets and maintain data integrity.

Tuskira

Series A in 2024
Tuskira, established in 2018, specializes in proactive cybersecurity. Its core product, Agentic AI Security Mesh, consolidates data from over 150 security tools, enabling organizations to proactively identify and mitigate vulnerabilities before they're exploited. This unified platform enhances existing defenses, facilitates real-time threat response, and empowers security teams to transition from reactive to proactive strategies, providing continuous protection against evolving cyber threats.

Simbian

Seed Round in 2024
Simbian specializes in AI-driven cybersecurity solutions. It integrates its intelligent AI platform into diverse corporate IT environments, enhancing security coverage and expediting incident resolution for security teams. Notably, Simbian offers an interactive, gamified learning experience to educate users about AI risks and identify vulnerabilities, further bolstering its security offerings.

Ox Security

Seed Round in 2022
Ox Security is a company that provides a comprehensive security platform aimed at safeguarding the modern software supply chain from vulnerabilities. Its solution offers real-time, end-to-end visibility into various elements that affect software throughout the development pipeline. By providing insight into the software supply chain attack surface, including source code, pipelines, artifacts, container images, runtime assets, and applications, Ox Security enables DevOps teams to effectively identify and mitigate potential security risks. This holistic approach allows organizations to prevent attacks and enhance their overall software security posture.

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. is a cybersecurity awareness solutions provider based in Austin, Texas, established in 2017. The company focuses on empowering employees as a critical line of defense against cybersecurity breaches by offering innovative training programs. Its flagship product, the Cyber Escape Room, enables employees to manage and engage in interactive experiences that enhance their understanding of cybersecurity threats. In addition to immersive training, Living Security provides online programs that educate employees on key security concepts through engaging puzzles and exercises. The company's approach incorporates scientific analysis of human risk factors, allowing enterprises to identify vulnerabilities and track improvements through detailed analytics and reporting. By fostering a culture of security awareness, Living Security aims to create lasting change that effectively reduces cybersecurity risks for organizations.

JupiterOne

Series A in 2020
JupiterOne, Inc. is a cloud-based cybersecurity asset management and automation software company headquartered in Morrisville, North Carolina, with additional offices in Charlotte, Salt Lake City, and Seattle. Founded in 2018, JupiterOne provides organizations with tools designed to enhance visibility and compliance in their cloud infrastructure. Its software assists chief information security officers, security operations teams, and compliance officers by automating asset discovery, managing cloud posture, conducting risk analysis, and facilitating compliance reporting. The platform also enables vulnerability management, threat hunting, and incident response. Additionally, the JupiterOne Insights application allows users to create customized reporting dashboards and visualizations, aiding in the identification of security issues within code repositories and development processes. By offering continuous data aggregation and relationship modeling across all assets, JupiterOne simplifies cloud security, making it more accessible and effective for organizations.

Mitiga

Seed Round in 2020
Mitiga, Ltd is a cybersecurity company based in Tel Aviv-Yafo, Israel, specializing in hybrid managed security services for cloud environments. The firm offers a comprehensive solution for detecting, investigating, and responding to threats in Software as a Service (SaaS) and cloud settings. Mitiga's services include incident response, breach readiness, and emergency assistance, enabling businesses to enhance their security posture. The company's technology automates preliminary investigative work during incidents, streamlining the response process and improving overall breach readiness. Additionally, Mitiga leverages artificial intelligence and high-performance computing to help organizations model and quantify potential losses from various catastrophic events, addressing the unique security challenges faced in modern digital environments.

Living Security

Series A in 2020
Living Security, Inc. is a cybersecurity awareness solutions provider based in Austin, Texas, established in 2017. The company focuses on empowering employees as a critical line of defense against cybersecurity breaches by offering innovative training programs. Its flagship product, the Cyber Escape Room, enables employees to manage and engage in interactive experiences that enhance their understanding of cybersecurity threats. In addition to immersive training, Living Security provides online programs that educate employees on key security concepts through engaging puzzles and exercises. The company's approach incorporates scientific analysis of human risk factors, allowing enterprises to identify vulnerabilities and track improvements through detailed analytics and reporting. By fostering a culture of security awareness, Living Security aims to create lasting change that effectively reduces cybersecurity risks for organizations.

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., founded in 2017 and based in San Francisco, California, specializes in application management for hybrid and multi-cloud environments. The company provides an enterprise-ready service mesh platform that simplifies the management of complex application infrastructures for DevOps, security, and network administrators. Tetrate's platform enables organizations to run and manage microservices effectively, facilitating the modernization of applications and accelerating the adoption of public cloud solutions. By partnering with enterprises on their app modernization journeys, Tetrate supports businesses in navigating the intricacies of modern cloud infrastructures.

Capsule8

Series B in 2018
Capsule8, founded in 2016 and headquartered in New York, specializes in cyber protection for enterprise infrastructure, focusing specifically on Linux systems. The company offers Capsule8 Protect, a platform designed to detect and mitigate attacks in real-time across various environments, including containerized, virtualized, and bare metal systems. With a team comprised of experienced hackers and security entrepreneurs, Capsule8 aims to provide continuous security, allowing organizations to safeguard their Linux-powered infrastructures from zero-day attacks and other unwanted activities without the need for human intervention. This innovative approach enables enterprises to modernize their systems while maintaining robust security.

Altitude Networks

Seed Round in 2018
Altitude Networks, Inc. is a cloud computing company founded in 2018 and based in San Francisco, California. The firm specializes in security solutions designed to protect enterprise data within cloud collaboration platforms, including SharePoint, OneDrive, and Google Drive. Altitude Networks offers a data loss prevention application that enables organizations to quickly identify, remediate, and prevent unauthorized access and sharing of sensitive information. Their solution emphasizes user-friendliness and effective remediation through automatic file sensitivity classification and identity mapping. This approach helps uncover backdoor access to cloud resources via employees' personal accounts and allows for one-click remediation to safeguard files. Altitude Networks serves a diverse clientele, ranging from small businesses with 50 employees to large enterprises with thousands, ensuring robust cloud security against potential data breaches and theft.
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