Nearly 1 million people who bought President Trump’s memecoin have lost money through the end of June, according to a report by the cryptocurrency analytics firm Nansen. Their losses total $3.81 billion. The analytics firm’s assessment was calculated this week after Mr. Trump signed an annual financial disclosure showing that he walked away with a $636 million payout on the same crypto bet, part of a haul of at least $2.2 billion from all of his business ventures in 2025. Once a crypto skeptic, Mr. Trump embraced the profit-making opportunity of digital currencies in 2024, while he was running for...