LONDON — Investigations over the last few years by United States and Swiss law enforcement officials into corruption in global soccer have exposed dozens of people and companies that, according to prosecutors, conspired to illegally reap profits from broadcasting and sponsorship deals tied to the sport’s biggest events.

One company never named in any of the charging documents, but referred to obliquely, is a little-known entity based in the canton of Zug in Switzerland: Mountrigi Management Group, a three-person operation that illustrates how some of the biggest deals at the top of the world’s most-popular sport were put together.

Mountrigi — which borrows its name from Switzerland’s Mount Rigi, also known as the Queen of the Mountains and as the muse for a series of paintings by the famed British watercolorist J. M. W. Turner — quietly amassed exclusive broadcast rights to the World Cup in much of the Americas, from Mexico down to Argentina, through 2030.

Ordinarily, such rights deals are announced publicly after a formal bid process, but not on this occasion. Details of the unusual arrangement first appeared in a plea agreement involving a company charged in the United States’ sprawling soccer investigation, and emerged again when the Swiss authorities this month accused FIFA’s former top administrator of accepting bribes in return for lucrative TV contracts.