Our Newsletter

april - Mayy | 2026
THE AI EXPLOIT ERA

May marked a major shift toward AI-driven security systems as exploitation workflows and agent runtime security rapidly moved into the mainstream. Rain portfolio company Astrix Security announced its reported ~$400M acquisition by Cisco, marking Rain Capital’s third exit in six months following Lakera and SPLX. Meanwhile, Rain leaders including Dr. Chenxi Wang, Dr. David Brumley, Sidra Ahmed Lefort, and David Cross contributed to industry conversations around AI exploitation, agentic enterprise security, and the evolving cybersecurity funding landscape.

JANUARY – MARCH | 2026
INFRASTRUCTURE SHIFT

Q1 2026 marked a shift toward agent-driven infrastructure, with the rise of Computer Use Agents (CUA) and agent-native systems redefining enterprise security around identity, posture, and observability. Portfolio companies including Straiker AI, Lema, and Claroty continue to build across this emerging stack as adoption accelerates.

November & December ｜ 2025
Portfolio Momentum

November and December marked strong milestones across the Rain Capital ecosystem. Zscaler announced its intent to acquire Rain portfolio company SPLX, while Clover Security raised $36M to accelerate its AI-native product security platform. Portfolio companies Astrix Security and Straiker AI were recognized on Fortune’s Cyber60 list, and Elisity earned a spot on Deloitte’s Technology Fast 500.

October｜ 2025
Portfolio Breakouts

October brought strong activity across the Rain Capital portfolio. Fleak.ai joined the Databricks AI Accelerator and raised a $5M seed round, while SPLX reported record growth. Rain companies Elisity and Seemplicity also received the SINET16 Innovation Award.

September | 2025
INDUSTRY SIGNALS

September brought key developments across the AI security landscape. Rain portfolio company Lakera was acquired by Check Point, while Straiker uncovered a new AI-powered offensive tool, and Rain partners Dr. Chenxi Wang and David Cross spoke at major industry events including TechCrunch Disrupt and the Madrona CIO Summit.

September | 2025
PORTFOLIO HIGHLIGHTS

August saw strong activity across the Rain Capital ecosystem. Seemplicity raised a $50M Series B to scale its security remediation platform, while SPLX exposed vulnerabilities during OpenAI’s GPT-5 rollout. Dr. Chenxi Wang also engaged the broader security community through SF Tech Weekend office hours and the Cyber Confidential podcast.