These St. Louis companies were $1B 'unicorns.' Their valuations have since plummeted.

In 2021, St. Louis startups Benson Hill and Nerdy went public in a pair of deals that valued each company at more than $1 billion, making each a so-called "unicorn." However, in the months since Nerdy and Benson Hill began trading publicly, their share prices have dropped dramatically and shaved hundreds of millions off of each company’s market capitalization.