The CEO of Robinhood's artificial intelligence based math startup company is valued at nearly 9 billion dollars.

Harmonic AI, an artificial intelligence startup founded by Robinhood CEO Tenev, has raised $100 million in funding to address the sometimes troubling issue for AI models: mathematics. Harmonic AI's Series B funding values the company at $875 million. Harmonic plans to open its flagship AI model "Aristotle" to researchers and the public later this year.