Elon Musk has set the stage for a new fight with the Securities and Exchange Commission, this time over how he disclosed his investment in Twitter that has made him the company’s largest investor.

The Tesla chief executive disclosed his 9.2% holdings in a form investors are required to file when they buy more than 5% of a company’s stock, without planning to seek control. But the notice came several days late. It also didn’t include a standard certification that underscores an investor’s passive status.