Poindexter Labs is the expert reasoning data company. It builds high-fidelity STEM training data for frontier AI models using an academic peer-review model - not factory workflows. Founded in 2025 by Jocelyn D'Arcy and headquartered in London, Poindexter's network of Olympiad medalists, PhDs and professors delivers 95%+ acceptance rates on the hardest problems in mathematics, physics, chemistry, computer science and engineering. The majority of major frontier models have been trained on data produced by Poindexter contributors.