Big names like Larry Ellison and Sequoia Capital have thrown their weight behind Musk's bid to take over the micro-blogging site. A little-known investment firm is one of the backers.

The third-biggest outside equity investor in the deal is Vy Capital, which has more than $5 billion in assets.

Alexander Tamas, the founder of Vy's, has been described by top venture capitalists as "Milner's human computer", but little is known about him. He was a founding member of the firm.

Musk's other companies were invested in by the same person. Some of Vy Capital's public assets have included holdings in two companies.

He liked Musk's April 21st message that said he wanted to "authenticate all real humans" and kicked off the bot dispute.

—Elon Musk (@elonmusk) April 21, 2022

The idea that our social media platforms should govern what we can and can't see is misguided according to him. Allowing private companies to decide on free speech would be dangerous.