When Elon Musk announced he was putting his $44bn acquisition of Twitter “temporarily on hold” on Friday, it sent a familiar spasm through the stock market.
Once again, the Tesla chief executive had used a brief tweet to deliver market-moving news. And once again, his offhand way of dealing with Wall Street provoked questions about how fully he was complying with securities regulations.
Musk’s notorious 2018 tweet declaring he was considering taking Tesla private, “funding secured”, brought a lawsuit from the Securities and Exchange Commission and led to a settlement in which the Tesla boss paid a fine and stood down as Tesla chair for three years.