(Reuters] – Elon Musk delayed disclosing his substantial stake in the U.S Securities and Exchange Commission. Twitter Inc (NYSE:) Last month, Wall Street Journal reported Wednesday that the Wall Street Journal had cited people who were familiar with the subject.

Reuters did not receive a response from the SEC or Tesla Inc’s top boss.

Musk announced a 9.2% share in Twitter on April 4. This makes him the largest shareholder of microblogging site. He secured the $44 Billion deal to acquire the company one week later.

Separately, the Information earlier reported that the Federal Trade Commission is investigating whether Musk violated a law that requires companies and people to report certain large transactions to antitrust-enforcement agencies.