Elon MuskImage source, Reuters
Image caption, Elon Musk's Twitter posts have brought him to the attention of financial regulators.

According to a US securities filing, Musk has a 9.2% stake in the company.

The news sent the shares soaring.

According to the Securities and Exchange Commission, the founder of the company bought 73,486,938 shares of the micro-blogging site.

The value of the stake is based on the closing price on Friday.

He is one of the largest shareholders in the company with a stake of more than 4%.

Musk is a regular user with more than 80 million followers, but recently he said he was thinking about building a new social media platform.

Musk asked his followers if they thought the social media platform encouraged free speech.

Free speech is important to a functioning democracy. Do you think that the principle of rigorously adhering to it is followed by Twitter?

He asked if a new platform was needed.

Given that Twitter serves as the de facto public town square, failing to adhere to free speech principles fundamentally undermines democracy.

What should be done? https://t.co/aPS9ycji37