AI Data Labeler Mercor In Talks To Raise $500 Million At $20 Billion Valuation

Three 23-year-old cofounders are on the verge of becoming multibillionaires for the second time this year. Mercor, an AI data labeling startup, is in advanced talks to raise $500 million at a $20 billion valuation, according to Forbes. The round, expected to close later this month, would value each cofounder's stake at roughly $4.3 billion.

Mercor supplies high-quality labeled data to train large language models and other AI systems. The company's explosive growth stems from the insatiable demand for annotated datasets as enterprises race to deploy generative AI. With this new funding, Mercor would more than double its previous valuation of $8 billion from just six months ago.

The startup's three cofounders—all graduates of Stanford University—started Mercor in 2023 out of a dorm room. They built a platform that combines human annotators with AI quality checks, claiming higher accuracy and faster turnaround than competitors like Scale AI and Labelbox. Mercor's revenue has reportedly surged past $1 billion annualized, though the company remains unprofitable due to heavy investment in infrastructure and hiring.

Investors in the latest round include existing backers such as Andreessen Horowitz and Sequoia Capital, alongside new participants from sovereign wealth funds in the Middle East. The deal underscores how AI data labeling—once seen as a low-margin commodity—has become a critical bottleneck in the AI supply chain. Large language model builders need meticulously curated data to avoid hallucination and bias, and Mercor's technology promises to deliver that at scale.

Industry observers point to Mercor's $20 billion valuation as a bellwether for the AI infrastructure boom. "Data is the new oil, and Mercor is the refinery," said one anonymous venture partner. The valuation also raises questions about market froth: Mercor's price-to-sales multiple would exceed 20x, even for a fast-growing startup. Competitors have raised similarly large rounds, but few at such dizzying multiples.

Looking ahead, Mercor plans to use the capital to expand into adjacent services like synthetic data generation and model evaluation. The cofounders have hinted at a potential IPO within two years. For now, the three 23-year-olds are preparing to join the ranks of the world's youngest self-made billionaires—a testament to the speed at which AI fortunes can be made.