Trump’s Sons Back Friend’s Penny Stock, Spurring 84% Price Jump

Two of President Donald Trump’s sons are investing in a small, unprofitable biotechnology firm-turned-investment bank headquartered in Trump Tower, adding to the first family’s growing list of business interests from within its own orbit.

Donald Trump Jr. and Eric Trump also joined the advisory board of the firm, Dominari Holdings Inc., according to a statement Tuesday. The news sent shares of Dominari — which traded below $1 as recently as December — surging as much as 84%. That followed a 91% gain on Monday.

Donald Trump Jr. at the Republican National Convention on July 16.

Photographer: David Paul Morris/Bloomberg

The Trumps will help Dominari focus on artificial intelligence and data centers, according ...