Exonic is building unsupervised biological AI, training biological foundation models on heterogeneous, unstructured, and noisy datasets. Its first application is the design of safer gene therapies, and in 2025 the company reported state-of-the-art results in liver cancer targeted gene therapy validated in vitro in its San Francisco lab. The company says it has trained a model with unprecedented zero-shot generalization on genomic regulatory expression. Exonic was founded in 2025 and is part of Y Combinator's Fall 2025 batch.