Alongside a two-lane road in Mountainside, New Jersey (population 7,020), is a small blue and white sign reading “YA,” which might be interpreted as an upbeat, blurted affirmative or as shorthand for a category of teen fiction, but is actually the logo of Yorkville Advisors. The firm’s office, a humble one-story building, is at the bottom of a small hill and hidden by hedges. Inside, billions of dollars in deals are engineered, including some for a very prominent client, a business associated with the president of the United States.

Donald Trump and his family’s efforts to cash in on his return to the White House are broad and audacious, from Trump’s millions of dollars in World Liberty crypto to the Trump Organization’s licensing of the Trump name for a mobile-phone service costing $47.

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