In March, Super Micro Computer was added to the S&P 500 after an epic run that lifted the stock by more than 2,000% in two years, dwarfing even Nvidia's gains.
Less than two weeks after the index changes were announced, Super Micro reached its closing high of $118.81 and had a market cap of almost $70 billion. The stock is down 72% since then, pushing the valuation to under $20 billion, the first major sign in the public markets that the hype around artificial intelligence may not all be justified.
Super Micro is one of the primary vendors for building out Nvidia-based clusters of servers for training and deploying AI models.
The stock plunged 33% on Wednesday, after the company disclosed that its auditor, Ernst & Young, had resigned, saying it was "unwilling to be associated with the financial statements prepared by management." Super Micro is now at risk of being delisted from the Nasdaq, and has until Nov. 16 to regain compliance with the stock exchange.
"We see higher delisting risk in the absence of an auditor and the potential challenge to getting a new one," analysts at Mizuho, who have the equivalent of a hold rating on the stock, wrote in a report on Wednesday.