ZeroPath is an AI-native application security platform that automatically finds and fixes software vulnerabilities. Founded in 2024 by four security and engineering veterans - including a former Google Security Engineer and a former Tesla Red Team engineer - ZeroPath replaces noisy legacy SAST tools with an LLM-powered engine that understands code semantics, verifies exploitability, and generates working patches. Within a year of launch, over 1,000 organizations trust ZeroPath to scan more than 200,000 codebases per month.
Zettascale Computing Corporation (formerly Exa Laboratories) builds polymorphic XPU chips that reconfigure their own dataflow architecture to match each AI model - delivering up to 27.6x greater energy efficiency than NVIDIA H100 GPUs. Founded by a 21-year-old Swedish dropout and a Cambridge-trained engineer, this YC S24 company is shipping prototype Grasshopper cards fully manufactured in America, with commercial release planned for 2026. Their ambition: make zettascale computing sustainable and become the hardware substrate for all future AI.
Zoa Research is a New York-based AI research lab building cross-domain quantitative forecasting models that generalize across finance, science, and beyond. Founded by Greg Volynsky and Sam Damashek - a Harvard Law/CMU duo and a Jane Street algorithmic trading veteran - Zoa trains LLM-powered multi-agent systems to automate the model-build-test-improve cycle. The result: forecasting engines that outperform narrow models in event prediction, deployed both as proprietary trading capital and as a Forecast-as-a-Service API for researchers, traders, and scientific labs. Backed by Y Combinator (S24), Zoa is building the infrastructure layer for probabilistic reasoning at scale.
Zuni (by Old House Labs Inc.) is a Chrome sidebar AI copilot built for knowledge workers who refuse to leave their existing tools. Rather than forcing users into yet another chat interface, Zuni sits quietly in the browser sidebar, reads the open tab, understands the Gmail inbox, and surfaces actionable intelligence in real time. Founded in 2024 by Cambridge alumni George Seabridge and Will Taylor (a 2x YC founder), Zuni is backed by Y Combinator (S24) and offers access to the world's leading AI models — GPT-4o, Claude 3.7 Sonnet, Gemini 2.0 Flash, DeepSeek R1, and more — all in one place, without switching apps.