Ms. Warren’s inquiry comes in the wake of reporting in The New York Times earlier this month about Beast Industries’s cryptocurrency plans. In a 2021 interview, Mr. Donaldson discussed a million-dollar Bitcoin bet that he had personally made and investments in several CryptoPunks, a type of nonfungible token, or NFT. Some of those bets returned 20 or 30 times the money he had laid out, he told interviewers.