Cohorts of 2021
Companies whose accelerator cohort started in 2021. 1,685 companies.
clusterB2B SaaS 183Consumer 168Fintech 155Healthcare and bio 126Commerce and marketplaces 111Developer tools 68Climate and energy 66Vertical AI agents 66Robotics and physical world 59Security and compliance 34Other 28Data for AI 24Horizontal AI assistants 17Defense and space 15Agent infrastructure 13AI infra and compute 7
| Company | Cluster | Program | Status | Last signal |
|---|---|---|---|---|
| Aer Compound compliance: the central hub for meeting SEC obligations | Security and complianceSEC compliance management platform | Y CombinatorS21 | Acquired | 2026-08-23 |
| Keyri Secure fraud prevention and authentication platform for developers | Security and complianceDevice fingerprinting and fraud prevention | Y CombinatorS21 | Acquired | checked 2026-08-17 |
| Pactima Live video signing for real-time agreements | Security and complianceeSignature and document verification | Y CombinatorS21 | Acquired | checked 2026-08-23 |
| Tarsal Data pipeline for your security data lake. | Security and complianceSecurity data pipeline infrastructure | Y CombinatorS21 | Acquired | 2026-08-23 |
| TelivyAI Automate your cyber security risk assessments | Security and complianceAI cyber risk assessment platform | Y CombinatorS21 | Acquired | 2026-08-23 |
| StacksiAI Automated Answers to Security Questionnaires | Security and complianceSecurity questionnaire automation | Y CombinatorW21 | Acquired | checked 2026-08-17 |