BREAKING: Elon Musk makes $43 billion offer to buy Twitter

In a tweet, Musk announced that he'd made an offer and linked to the SEC filing.

Musk's offer would represent a 54 percent premium over the Jan 28. closing price and a value of about $43 billion" according to Bloomberg Business.

The 50-year-old Musk filed with the US Securities and Exchange Commission on Thursday morning. That filing included a letter sent to Twitter's Chairman of the Board Bret Taylor, reading:

"I invested in Twitter as I believe in its potential to be the platform for free speech around the globe, and I believe free speech is a societal imperative for a functioning democracy.

"However, since making my investment I now realize the company will neither thrive nor serve this societal imperative in its current form. Twitter needs to be transformed as a private company.

"As a result, I am offering to buy 100% of Twitter for $54.20 per share in cash, a 54% premium over the day before I began investing in Twitter and a 38% premium over the day before my investment was publicly announced. My offer is my best and final offer and if it is not accepted, I would need to reconsider my position as a shareholder.

"Twitter has extraordinary potential. I will unlock it."

The filing further showed that Musk had said to Taylor, via text:

"As I indicated this weekend, I believe that the company should be private to go through the changes that need to be made.

"After the past several days of thinking this over, I have decided I want to acquire the company and take it private.

"I am going to send you an offer letter tonight, it will be public in the morning.

"Are you available to chat?"

Further, a voice script showed Musk saying:

"Best and Final," with these points listed "I am not playing the back-and-forth game," "I have moved straight to the end," "It's a high price and shareholders will love it."

In the event that the buy does not go through, Musk said "If the deal doesn't work, given that I don't have confidence in management nor do I believe I can drive the necessary change in the public market, I would need to reconsider my position as a shareholder.

"This is not a threat," he went on to say, "it's simply not a good investment without the changed that need to be made. And those changes won't happen without taking the company private."

"My advisers and my team are available after you get the letter to answer any questions. There will be more detail in our public filing. After you receive the letter and review the public filings, your team can call my family and office with any questions."

After his initial purchase of 9.1 percent of a stake in the company, Musk was set to join the Twitter board of directors. However, Parag Agrawal, CEO of Twitter, announced on the platform Sunday night that Elon Musk "decided not to join" the tech giant’s board.

This led to speculation that Musk was planning a hostile takeover of the company. Had he decided to join the board, he would have to cap his ownership of the company at 15 percent.

The filing shows that "Musk has hired Morgan Stanley as his adviser for the takeover. The offer price also includes the number 420, widely recognized as a coded reference to marijuana. He also picked $420 as the share price for possibly taking Tesla private in 2018, a move that brought him scrutiny from the SEC."

Some had been suggesting that a hostile takeover could be a possibility. "He wants the influence, and so the potential is now set up for a hostile takeover of Twitter or at least, the threat of a hostile takeover of Twitter if they do not change their wayward ways," Jack Posobiec said on Human Events Daily earlier this week.