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A New York cellphone executive has emerged as a mystery megadonor behind the presidential campaign of Senator Ted Cruz of Texas.

Federal campaign finance reports identified the source of a $250,000 donation to the Stand for Principle PAC, a group backing Mr. Cruz, only as “V3 231 LLC.”

But records tie the donation to Ben Nash, the chief executive of PCS Wireless, and a spokesman acknowledged that Mr. Nash was behind the donation.

The spokesman, Robert Barletta, said in the statement that “V3 231 LLC, of which Ben Nash is a member of the ownership group, donated $250,000 to Stand for Principle” in January. “The donation was transparent and fully within federal campaign finance laws,” Mr. Barletta said. “Senator Cruz has been a strong supporter of Jewish issues, and this was the basis for the donation.”

Mr. Nash, a former Yeshiva student, co-founded PCS Wireless in 2001 as a teenager and built it into a major global distributor of new and used phones and mobile devices.

More than any other candidate, Mr. Cruz and the political committees backing him have drawn their financial support from a remarkably small group of donors. A single donor – Robert Mercer, a hedge fund executive in New York – gave $11 million to one of the super PACs supporting him, and an investor based in Puerto Rico – Toby Neugebauer – donated another $10 million.