Explainer: Is Elon Musk's deal to buy Twitter falling apart?

There are several reasons that Musk’s Twitter deal might have lost its luster since he signed it in April. Twitter is standing firm on Musk's agreed price of $54.20 per share — but since early May, the stock has fallen more than 25% below that figure. The gap between the deal price and the actual share price suggests that many investors don’t think the deal will go through.