Y Combinator Summer 2025 (S25) Companies

Stellon Labs develops compact AI models optimized for edge computing and resource-constrained hardware environments.

3 investors

Stockline provides enterprise resource planning software designed for food wholesalers that uses AI agents to automate administrative work like order entry.

4 investors

Stormy is an AI workflow automation platform that handles creator outreach, negotiation, and campaign management for marketing teams. It integrates with Gmail, Google Sheets, TikTok, Instagram, YouTube, and team chat to automate follow-ups, track deliverables, and surface only decisions requiring human approval.

2 investors

Synthetic Society provides AI-driven user simulations for software development, enabling teams to test products and catch UX issues during the development phase rather than after release. The platform helps developers accelerate development cycles, reduce manual testing, and gather actionable user feedback through synthetic agents that behave like real users.

4 investors

Tecto provides AI adoption and governance solutions for regulated organizations, focusing on building trustworthy and accountable AI systems for public and private sectors.

2 investors

Tesora provides AI agents that assist actuaries at property and casualty insurers, reinsurers, and managing general agents by automating data assembly, method execution, and rating deployment while keeping actuarial decision-making under human control, with deployment on the client's infrastructure and full data privacy protections.

1 investor

A platform that optimizes product visibility in AI-generated answers and enables products to be discovered by AI agents when answering questions or completing tasks. It helps companies measure traffic and mentions from AI bots.

1 investor

Theora partners with Indian healthcare organizations to aggregate, structure, and de-identify clinical and genomic data for pharmaceutical and AI research, addressing the underrepresentation of Indian populations in drug discovery and genetic studies.

1 investor

Topological develops physics-based foundation models for CAD optimization to help hardware engineering teams accelerate their design and optimization workflows. The platform generates efficient designs for complex mechanical problems by understanding physics, geometry, and manufacturability constraints.

1 investor

Trace provides an AI orchestration platform that models task flows between departments and aligns AI agents with human judgment to automate operational workflows at scale. The product is designed for enterprise teams seeking to automate complex multi-department processes while maintaining visibility and control.

1 investor

TraceRoot.AI provides an open-source observability and automatic remediation platform for AI agents, enabling developers to capture execution traces and diagnose issues with AI-assisted debugging that incorporates source code and version control context.

3 investors

Truth Systems provides infrastructure for lawyers to maintain trust and safety standards across AI tools they use in legal practice. The company enables compliance and governance of AI adoption within law firms and legal organizations.

2 investors

Twenty Two develops AI-powered biosecurity infrastructure for screening and monitoring biological threats across the emerging bioeconomy. The platform provides automated customer screening, functional sequence prediction, and model safeguards to help organizations comply with dual-use research regulations.

1 investor

Uplift AI develops voice synthesis models for regional and underrepresented languages, enabling digital service access through voice interfaces in local languages. The platform serves developers and organizations building voice-enabled applications for non-English speaking populations.

2 investors

Veritus provides AI-powered voice, SMS, email, and chat agents for lenders, banks, and collection agencies to re-engage loan applicants, handle customer service, and manage borrower delinquencies while maintaining regulatory compliance. The platform automates outbound outreach, payment processing, and collections conversations across the lending and servicing lifecycle.

2 investors

Verne Robotics develops robotics technology, with a focus on multi-modal perception capabilities. The company is founded by a researcher with expertise in vision systems and robotic perception.

3 investors

VibeFlow is a design tool that automatically extracts design systems from URLs and enables users to create branded content including slide decks, posters, landing pages, ads, and brand kits.

1 investor

Vulcan builds AI agents for government workers and related professionals, offering Justinian (an agent for personnel in government and adjacent sectors with access to a legal and policy knowledge base) and Trajan (a public-facing concierge for citizens and businesses to navigate permitting, licensing, and regulatory questions on government websites).

2 investors

Wafer develops performance optimization tools and services across GPU accelerators, architectures, and computing stack layers.

1 investor

Wayline develops an AI-powered property management system that automates maintenance, support, leasing, and communication for multi-unit residential buildings. The platform aims to increase operational efficiency and reduce costs for property managers and real estate operators.

3 investors

Wedge builds AI agents that automate back-office operations for health systems, including payment reconciliation, medical records retrieval, claims management, and coding. The company serves large hospitals, health plans, and multi-physician groups to reduce administrative costs and improve revenue cycle efficiency.

2 investors