b12 Labs

YC S25 · Active · Making hard molecules for Pharma and Biotech

Competitors

Companies closest to b12 Labs
Company	Category	Status	Program
Numerion LabsShared: drug discovery, medicinal, chemistryActiveAI	AI	Active	YCW15
PostEraShared: drug discovery, molecule, medicinalActiveAI	AI	Active	YCW20
1910Shared: drug discovery, molecule, biotechActiveAI	AI	Active	YCW19
Lavo Life SciencesShared: ai-powered drug discovery, molecule, pharmaInactiveAI	AI	Inactive	YCW23
Tamarind BioShared: drug discovery, molecule, pharmaActiveAI	AI	Active	YCW24

Adjacent

Companies next to b12 Labs
Company	Category	Status	Program
Atlas DiscoveryShared: ai-powered drug discovery, pharma, drug discovery and deliveryActiveAI	AI	Active	YCS26
Rosebud BiosciencesShared: drug discoveryActiveAI	AI	Active	YCW22
Output BiosciencesShared: ai-powered drug discovery, lab, levelActiveAI	AI	Active	YCS21
Paceline BioShared: ai-powered drug discovery, pharma, biotechActiveAI	AI	Active	YCF25
Harmonic DiscoveryShared: drug discoveryActiveAI	AI	Active	YCS21

Also from S25 in AI

All of S25

Company	Category	Status
ConvexiaThe world's first AI-maximalist pharma companyActiveAI	AI	Active
DeepAware AI (Robotics Center of Silicon Valley)Robots, parts & RL envs & evals - delivered in 48 hrs / pickup in SF.ActiveAI, Data	AI, Data	Active
Physical TuringEvaluating humanoids in the real worldActiveAI	AI	Active
Rellingdeploying the first billion robots for manufacturingActiveAI, Devtools	AI, Devtools	Active
TopologicalPhysics-based foundation models for CAD optimization.ActiveAI, Devtools	AI, Devtools	Active
AcrelyEnterprise Voice AgentsActiveAI	AI	Active

Founders

Zlatko JončevFounder/CEO
Andres BranFounder/CTO

About b12 Labs

b12 makes high-value molecules that are otherwise hard to make. We help pharma companies plan and make new drugs, accelerating early-stage drug discovery from years to months. Andres built the first AI agent that can autonomously think and make molecules in a robotic lab, published in Nature Machine Intelligence (1000+ citations), and won the best paper award at the NeurIPS AI for Science conference. Zlatko is a 3x National Chemistry Olympiad champion, competed at IChO level, and medicinal chemist who has worked at Roche and leading lab robotics companies. Combined, we have an extensive network of hundreds of chemists, automation scientists, and AI 4 Science researchers. We run paid pilots with big pharma companies, demonstrating that our platform planned a set of experiments that achieved full conversion in a single attempt, eliminating the iteration cycle.

YC batch: S25 · Summer 2025
Status, per YC: Active
Category: AI
Team size: 3
Location: San Francisco, CA, USA
Founded: 2025
Checked: 35m ago

YC tags: AI-powered Drug Discovery, Robotics

b12 Labs in S25: 166 companies, 92% AI

b12 Labs: questions

Which YC batch was b12 Labs in?

b12 Labs was in Y Combinator's Summer 2025 batch (S25).

Is b12 Labs still active?

Y Combinator lists b12 Labs as active.

Who founded b12 Labs?

b12 Labs's founders, as listed on its YC page: Zlatko Jončev (Founder/CEO), Andres Bran (Founder/CTO).

Where is b12 Labs based?

b12 Labs lists San Francisco, CA, USA as its location on YC's directory.

Sources: each program's public company list, read twice a week. Not affiliated with Y Combinator or any other program. Logos via logo.dev; trademarks belong to their owners.