Back in August, Eric Trump and Donald Trump Jr. were all smiles. They showed up at the Nasdaq stock exchange in New York to celebrate a new business partnership with a little-known publicly traded company, then called Alt5 Sigma, to give investors easier access to a cryptocurrency backed by the Trump family.

Less than 10 months later, the company has warned investors it may not be able to stay in business much longer. Its share price has fallen more than 90%, and a rebranding hasn’t revived investor interest. If the company, now called AI Financial Corp., can’t sustainably raise its share price out of penny-stock levels in the next 15 trading days, it faces the prospect of being delisted by the Nasdaq.

One of the few parties who…