Elon Musk offers to buy Twitter for $43 billion

Musk wrote in a letter sent to Twitter Chairman Bret Taylor

I invested in Twitter as I believe in its potential to be the platform for free speech around the globe

Twitter shares closed down 1.68% on Thursday

My offer is my best and final offer and if it is not accepted

I would need to reconsider my position as a shareholder

Musk first disclosed his stake in the social media giant on April 4

Parag Agrawal reportedly told employees in a staff meeting that the company is evaluating the offer