On Thursday, billionaire Tesla CEO Elon Musk announced he had made an offer to buy Twitter for $43 billion.

Musk revealed his interest in purchasing Twitter earlier in the day by tweeting a filing to the Securities and Exchange Commission stating the acquisition depended on the "completion of anticipated financing."

Right now, according to Bloomberg, Musk has about $3 billion in readily accessible cash. So he would have to finance the rest of the deal some other way, whether that is selling shares of Tesla or borrowing money.

Musk owns about 173 million Tesla shares. However, securities filings show that 88 million of them are being used to back personal loans. Still, he has the option to buy 60 million more shares, the filings show.

If Musk were to use Tesla shares, Twitter could still reject his offer on the grounds that the financing he had secured was not reliable, said Kevin Kaiser,

Elon Musk is the founder, CEO, and Chief Engineer at SpaceX and Product Architect of Tesla

Net Worth Around $282 billion

Elon Musk Created a video game at the age of 12 and later sold it for $500