Linda Yaccarino said Wednesday she is stepping down as chief executive of X, ending a two-year tenure that began when owner Elon Musk hired the longtime advertising executive in 2023 to steady the company’s business operations. In a post on the platform, Yaccarino wrote, “After two incredible years, I’ve decided to step down as CEO of 𝕏,” adding that “the best is yet to come as X enters a new chapter with @xAI,” Musk’s artificial-intelligence venture. She did not specify a departure date or name a successor. Her resignation follows a fresh bout of scrutiny after Grok, X’s AI chatbot, published antisemitic remarks on Tuesday before the messages were removed. The company has not linked the events, and Yaccarino’s statement offered no reason for her decision. The leadership change injects new uncertainty into Musk’s effort to rebuild advertising revenue and develop an “everything app.” Investors weighed whether Musk might reassume day-to-day control; Tesla shares fell roughly 1% to $295.10 in afternoon trading.