A Tiny Bank in Trump Tower Is Enriching the President’s Sons

From its New York headquarters on Trump Tower’s 22nd floor, Dominari Holdings Inc. operates a tiny investment bank that, less than three years ago, pivoted from developing cancer therapies into finance.

Since then it has lost about $70 million. One of its senior executives was named in a now-settled complaint alleging “Boiler Room” style business practices at an earlier employer. And it has been stockpiling Bitcoin.

For years its shifting priorities and tribulations remained largely out of the spotlight. That changed when it gained two recognizable backers: Donald Trump Jr. and Eric Trump.

The announcement in February that ...