b12 Labs (YC S25) — Making hard molecules for pharma and biotech
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.
b12 Labs is a Y Combinator company in the Summer 2025 batch. Its directory entry describes it as: Making hard molecules for Pharma and Biotech. The founders listed are Zlatko Jončev (Founder/CEO), Andres Bran (Founder/CTO) (Y Combinator directory entry, July 20, 2025).
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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.
Zlatko Jončev
Founder/CEO
Andres Bran
Founder/CTO
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
One of 60 companies held here in Healthcare › Drug Discovery and Delivery.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
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Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
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