Y Combinator Spring 2025 (X25) Companies

Parsewise builds enterprise software that transforms fragmented, unstructured data into structured evidence to enable organizations to make reliable risk decisions. The product is designed for subject matter experts in regulated industries who need to identify risks earlier and act faster on complex information.

2 investors

Partcl develops AI-powered chip design software that uses physics models and GPU computing to accelerate the design process for semiconductor engineers.

2 investors

Pelica Health builds an AI operating system for value-based care, helping healthcare organizations close care gaps and manage operations across multiple vendor systems. The platform is designed for health plans and value-based care providers managing quality metrics and clinical workflows.

1 investor

Percival develops an AI assistant that helps researchers process and interpret real-world datasets for analytical purposes.

1 investor

PgDog is a PostgreSQL proxy that provides connection pooling, load balancing, and distributed database sharding without requiring application code changes. It maintains ACID compliance and horizontal scalability for PostgreSQL deployments.

1 investor

Photonium develops AI-assisted optical design software and consulting services for engineers designing lenses and optical systems. The platform automates design exploration and optimization workflows for applications in satellites, drones, AR/VR, quantum computing, and consumer electronics.

2 investors

Plexe provides infrastructure for deploying machine learning models to production, serving millions of inferences daily. The platform enables teams to move from development to production in weeks rather than quarters.

6 investors

PWR Matrix develops simplified power delivery architectures and semiconductor innovations to improve energy efficiency for advanced applications including AI infrastructure and electronics.

1 investor

Herm is an API platform for deploying customer-facing AI agents with infrastructure built in, enabling developers to provision isolated agents with memory, automations, and tool integration via a single API call. The service targets product teams building AI agent features, handling container isolation, session management, and credential management without requiring custom infrastructure.

1 investor

Probo helps organizations manage and demonstrate compliance with standards like ISO 27001 and SOC2. The platform serves companies seeking to simplify compliance assessment and implementation.

2 investors

Propolis provides automated quality assurance testing using multiple autonomous browser agents that simulate user behavior on websites and applications.

2 investors

QFEX operates a 24/7 exchange where traders can access US equities, commodities, and foreign exchange pairs with leverage options up to 100x, as well as perpetual futures contracts. The platform targets retail and institutional traders seeking direct market access without traditional broker intermediation.

3 investors

QualGent builds AI-native quality infrastructure for software testing and verification, enabling enterprises to validate AI-generated code and systems at scale with deterministic confidence. The platform uses multi-agent AI reasoning to plan, execute, and evaluate software behavior in production environments.

2 investors

Ralo is an AI-powered mortgage platform that uses machine learning to automate loan processing tasks traditionally performed by multiple intermediaries, enabling lower rates and faster closings for borrowers. The company targets consumers seeking mortgages and aims to reduce hidden fees and overhead costs in the lending process.

1 investor

Refresh builds simulation environments and evaluation benchmarks for frontier AI labs to measure and improve model capabilities. The company focuses on creating realistic, production-grade testing environments that accurately assess AI system performance.

1 investor

Rimba provides an AI-powered platform for operations, supply chain, and compliance teams in energy and industrial companies. The platform automates manual data entry, reporting, and compliance monitoring across fragmented enterprise systems.

1 investor

RunRL offers a platform for improving machine learning models using reinforcement learning. The product is announced as coming soon.

1 investor

Scalar Field is an AI trading platform that provides market research, backtesting, and trading agents connected to brokerages for execution across equities, options, prediction markets, and pre-IPO securities.

3 investors

Sieve provides a data quality platform that combines AI and human validation to clean and verify financial datasets for investment teams. The company serves asset managers, hedge funds, investment banks, family offices, and other financial institutions seeking to reduce time and cost spent on data validation and remediation.

3 investors

Sim is an open-source AI workspace where teams build, deploy, and manage AI agents across their existing tool stack using 1,000+ integrations and every major LLM. The platform enables automation of real work through visual, conversational, or code-based interfaces for technical teams.

2 investors

SixtyFour provides AI agents that conduct deep research on people and companies by autonomously gathering and cross-referencing data from multiple sources including official records and the web. The platform delivers structured intelligence profiles for threat detection, talent recruitment, and compliance investigations.

1 investor

StarSling builds AI-native continuous integration for GitHub Actions, providing fast runners and agents that analyze workflows, logs, and telemetry to automatically open pull requests optimizing CI pipelines. The platform targets software development teams seeking to reduce DevOps bottlenecks and accelerate deployment cycles.

4 investors

Stratify provides continuous user research and usability testing for UX teams, enabling scalable user interviews to validate designs and inform product decisions. The platform helps product and design teams gather feedback on prototypes, wireframes, and user flows throughout the design process.

1 investor

A data collection company that gathers high-quality human data across diverse interactions and environments to support development of multimodal and embodied AI systems.

1 investor