# Y Combinator

Source: https://onco.cc/companies/y-combinator/  
OnCo record `y-combinator` (Company). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Y Combinator is the start-up accelerator that funds hundreds of new companies a year in return for a small stake. Since 2014 it has backed a steady stream of companies going after cancer, from blood tests to engineered viruses.

## Summary

Y Combinator runs batches of early-stage companies, investing a standard amount for a fixed equity stake and then a further amount on the same terms as the company's next round, with a three-month programme and Demo Day. Its open directory lists more than 6,000 funded companies; the oncology subset in OnCo (companies with a `ycBatch`) was drawn from that directory and checked one by one. YC's biotech share grew from the mid-2010s, when it began accepting companies such as Notable Labs, Shasqi and BillionToOne, to recent batches with several cancer therapeutics, diagnostics and oncology AI companies each cycle. It is an accelerator rather than a specialist life-science fund, so its oncology bets skew towards software, diagnostics and platform biology with short paths to first revenue or data.

## Fields

- Kind: Company
- Last checked: 2026-09-10
- Tags: accelerator
- HQ: San Francisco, CA
- Type: investor
- Website: https://www.ycombinator.com

## Sources

- Official website: https://www.ycombinator.com
- YC company directory: https://www.ycombinator.com/companies
- Open YC directory dataset (yc-oss/api): https://github.com/yc-oss/api

## Connected records

- fronts: [AI & Computation](https://onco.cc/fronts/ai-computation/), [Diagnostics & Biomarkers](https://onco.cc/fronts/diagnostics/), [Drug Discovery Platforms](https://onco.cc/fronts/drug-discovery/)
- companies: [Adialante](https://onco.cc/companies/adialante/), [Adventris Pharmaceuticals](https://onco.cc/companies/adventris-pharmaceuticals/), [Algen Biotechnologies](https://onco.cc/companies/algen-biotechnologies/), [Alixia](https://onco.cc/companies/alixia/), [Altay Therapeutics](https://onco.cc/companies/altay-therapeutics/), [Aluna](https://onco.cc/companies/aluna/), [Ananya Health](https://onco.cc/companies/ananya-health/), [AOA Dx](https://onco.cc/companies/aoa-dx/), [Arpeggio Bio](https://onco.cc/companies/arpeggio-bio/), [Asher Biotherapeutics](https://onco.cc/companies/asher-bio/), [Atomic Alchemy](https://onco.cc/companies/atomic-alchemy/), [Bikanta](https://onco.cc/companies/bikanta/), [BillionToOne](https://onco.cc/companies/billiontoone/), [Blank Bio](https://onco.cc/companies/blank-bio/), [Cambridge Cancer Genomics (CCG.ai)](https://onco.cc/companies/cambridge-cancer-genomics/), [Clear Gene](https://onco.cc/companies/clear-gene/), [Cofactor Genomics](https://onco.cc/companies/cofactor-genomics/), [Data Driven Bioscience (Duoseq)](https://onco.cc/companies/data-driven-bioscience/), [Delee](https://onco.cc/companies/delee/), [Digistain](https://onco.cc/companies/digistain/), [Eris Biotech](https://onco.cc/companies/eris-biotech/), [FidoCure](https://onco.cc/companies/fidocure/), [FinalDose](https://onco.cc/companies/finaldose/), [Gamgee](https://onco.cc/companies/gamgee/), [Granza Bio](https://onco.cc/companies/granza-bio/), [Guardian Bio](https://onco.cc/companies/guardian-bio/), [Harmonic Discovery](https://onco.cc/companies/harmonic-discovery/), [HistoWiz](https://onco.cc/companies/histowiz/), [Humane Genomics](https://onco.cc/companies/humane-genomics/), [Isabl](https://onco.cc/companies/isabl/), [iSono Health](https://onco.cc/companies/isono-health/), [Kernal Biologics](https://onco.cc/companies/kernal-biologics/), [Known Medicine](https://onco.cc/companies/known-medicine/), [Kopra Bio](https://onco.cc/companies/kopra-bio/), [LEAH Labs](https://onco.cc/companies/leah-labs/), [Liyfe](https://onco.cc/companies/liyfe/), [Luminate Medical](https://onco.cc/companies/luminate-medical/), [Mednet (theMednet)](https://onco.cc/companies/mednet/), [Modulari-T](https://onco.cc/companies/modulari-t/), [NearWave](https://onco.cc/companies/nearwave/), [Notable Labs](https://onco.cc/companies/notable-labs/), [Nucleo](https://onco.cc/companies/nucleo-research/), [Numen](https://onco.cc/companies/numen/), [Omanta](https://onco.cc/companies/omanta/), [Oncobox](https://onco.cc/companies/oncobox/), [Origin Bio](https://onco.cc/companies/origin-bio/), [Persephone Biosciences](https://onco.cc/companies/persephone-biosciences/), [REPROSENT](https://onco.cc/companies/reprosent/), [ResistanceBio (Viosera Therapeutics)](https://onco.cc/companies/resistancebio/), [Reverie Labs](https://onco.cc/companies/reverie-labs/), [Serinus Biosciences](https://onco.cc/companies/serinus-biosciences/), [Shasqi](https://onco.cc/companies/shasqi/), [Signatur Biosciences](https://onco.cc/companies/signatur-biosciences/), [Strand AI](https://onco.cc/companies/strand-ai/), [SynsoryBio](https://onco.cc/companies/synsorybio/), [TareBio](https://onco.cc/companies/tarebio/), [Tradewind BioScience](https://onco.cc/companies/tradewind-bioscience/), [Triomics](https://onco.cc/companies/triomics/), [Valink Therapeutics](https://onco.cc/companies/valink-therapeutics/), [Velorum Therapeutics](https://onco.cc/companies/velorum-therapeutics/), [X-Zell](https://onco.cc/companies/x-zell/), [Yemaachi Biotech](https://onco.cc/companies/yemaachi-biotech/), [zPREDICTA](https://onco.cc/companies/zpredicta/)

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JSON: https://onco.cc/api/v1/entities/y-combinator.json