TrainLoop
YC W25San Francisco, US · Founded 2025 · 6 employees · 3 known investors
TrainLoop is a post-training research lab that trains specialized AI models for enterprise customers in pharma, biotech, logistics, and banking. The company develops custom foundation models and agents optimized for long-horizon tasks and mission-critical workflows in high-risk industries.
Also known as Phoenix
AI & Machine LearningDeep TechDeveloper ToolsEnterprise SoftwareGenerative AIReinforcement LearningUnited States of AmericaAmerica / Canada
Founders & leadership· Y Combinator alumni (W25)
TrainLoop was founded in 2025 by Jackson Stokes and Mason Pierce.
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Jackson StokesinCo-FounderJackson Stokes is a cofounder at TrainLoop who previously worked on performance optimization for Google's Gemini and AlphaFold projects.
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Mason Piercein𝕏Co-Founder/CTOMason Pierce has worked on applying AI models to business problems, with a focus on fine-tuning. He founded TrainLoop to address challenges in the fine-tuning process.
Investors · 3
Competitors · 10
by search overlap
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CoLoop5 shared keywordsCoLoop is a platform that consolidates qualitative research data from various sources and formats, allowing teams to analyze and query research across projects using AI-powered insights with human oversight. The platform serves research teams at agencies, enterprises, and independent researchers conducting market research, concept testing, and customer insights work.
Netezza5 shared keywordsIBM is a global technology company whose business spans enterprise software (including Red Hat, HashiCorp, and Confluent), IT infrastructure such as mainframes, servers, and storage, and IT consulting services. The company is also investing heavily in quantum computing and AI-based enterprise offerings, including its Lightwell open-source software security clearinghouse and the Anderon quantum wafer foundry.
Medeloop4 shared keywordsMedeloop builds AI agents for healthcare research that let teams ask research questions in plain English and get publication-ready real-world evidence, with a federated model that runs compute on the user's own EHR, claims, and registry data. Its platform spans grant discovery, real-world data analytics, and clinical care, serving pharma and life sciences, health systems, CROs, and academic medical centers.
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Frequently asked questions
- What does TrainLoop do?
- TrainLoop is a post-training research lab that trains specialized AI models for enterprise customers in pharma, biotech, logistics, and banking. The company develops custom foundation models and agents optimized for long-horizon tasks and mission-critical workflows in high-risk industries.
- Who founded TrainLoop?
- TrainLoop was founded by Jackson Stokes, Mason Pierce in 2025.
- Who are TrainLoop's investors?
- TrainLoop's investors include Moonfire Ventures, Olive Tree Capital, Y Combinator.
- Where is TrainLoop headquartered?
- TrainLoop is headquartered in San Francisco, US.