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Elon Musk is facing a new round of regulatory trouble for tweets about Tesla Inc., raising fresh concerns about the chief executive officer’s ability to keep his impulses in check and responsibly run a public company.

The Securities and Exchange Commission is investigating whether Nissan Motor Co. accurately disclosed its executive pay in the United States, according to several people familiar with the matter, compounding the carmaker’s woes as it grapples with the aftermath of former Chairman Carlos Ghosn’s arrest.