Y Combinator · W25
Y Combinator Winter 2025 startups
RemJobs lists 160 startups from Y Combinator's Winter 2025 batch. 123 of the 160 startups are based in the United States, and 90 in San Francisco. Between them they are in 18 countries and 35 cities. 7 are hiring remotely.
Updated
- startups
- 160
- countries
- 18
- cities
- 35
- hiring remotely
- 7
Winter 2025 startups
- ParagonYC W25Paragon is the AI growth engine for distributors and manufacturers, freeing up staff and growing revenue on autopilot. San Francisco, United States Remote: United States
- MercuraYC W25Mercura automates quotes and orders for distributors & manufacturers in the construction supply chain. Our software lets sales teams process requests in minutes instead of days… Munich, Germany
- Orbital OperationsYC W25Orbital Operations is developing a high thrust, reusable space vehicle for satellite defense. We protect critical satellites, like GPS and Military communication satellites, from… Long Beach, United States
- OsmosisYC W25Osmosis is a post-training platform that helps companies fine-tune language models using reinforcement learning. We work with fast-growing AI companies to train… San Francisco, United States Remote: Worldwide
- MastraYC W25Mastra is the easiest way to build a production AI application, built by the team that brought you Gatsby. We provide a complete set of AI primitives: workflows for complex… San Francisco, United States Remote: Worldwide
- EdexiaYC W25AI tool that grades English essays and gives feedback for Australian and IB curricula, saving teachers marking time. Brisbane, Australia
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154 more W25 startups
Unlock the full list, every company on the map, and their founders, emails, LinkedIn and careers pages.
Where they are
15 more in other countries or with no known location
Hiring remotely
7 startups from W25 had at least one open remote role when their job boards were last read, 33 remote roles between them.
Other batches
Questions
How many startups are in Y Combinator's Winter 2025 batch?
RemJobs lists 160 startups from the Winter 2025 batch (W25) as of Oct 2, 2026, including Paragon, Mercura, Orbital Operations, Osmosis and Mastra. The count covers the companies we have found, which may be fewer than the batch itself.
Where are Y Combinator Winter 2025 startups based?
123 of the 160 startups are based in the United States, and 90 in San Francisco. Between them they are in 18 countries and 35 cities. By country: United States (123), United Kingdom (7), Germany (4), Canada (3) and Sweden (3).
Which W25 startups are hiring remotely?
7 startups had open remote roles when their job boards were last read, 33 remote roles between them, including Paragon, Osmosis, Mastra, Weave and Mesh.
Can I contact the founders of W25 startups?
Each company has a free public profile. 8 of them have founder names on file, and members see the founders, their emails where found, LinkedIn and careers pages, and every company on the map.
Companies come from public sources: their own websites, public startup directories and accelerator portfolios, and their public job boards (Greenhouse, Lever, Ashby), which were last read through Oct 2, 2026. A company that is missing or out of date can write to us from the footer.