Last month, federal authorities charged the founder of the electric vehicle manufacturer Nikola, which had gone public in the summer of 2020, with defrauding investors. They were led there partly by the work of a little-known Wall Streeter named Nathan Anderson.A stock researcher and investor, Mr. Anderson and his upstart firm, Hindenburg Research, are having a moment. In early August, the Securities and Exchange Commission subpoenaed the sports betting firm DraftKings after Hindenburg said in a June report that it had potentially enabled black-market betting. And shares of Lordstown Motors have fallen nearly 70 percent since Hindenburg said in March that …
