The board of Twitter has unanimously recommended that shareholders approve the proposed $44 billion sale of the company to multibillionaire Elon Musk, according to a regulatory filing Tuesday.

Musk reiterated his desire to move forward with the acquisition last week during a virtual meeting with Twitter employees, though shares of Twitter remain far below his offering price, signaling considerable doubt that it will happen.

On Tuesday at the Qatar Economic Forum in an interview with Bloomberg, the Tesla CEO listed the approval of the deal by shareholders as one of several "unresolved matters" related to the Twitter deal.

Shares of Twitter Inc. were essentially flat just before the opening bell Tuesday and far short of the $54.20 per share that Musk has offered to pay for each. The company's stock last reached that level on April 5 when it offered Musk a seat on the board before he had offered to buy all of Twitter.

In a filing with the United States Securities and Exchange Commission (SEC) on Tuesday detailing a letter to investors, Twitter's board of directors said that it "unanimously recommends that you vote (for) the adoption of the merger agreement." If the deal were to close now, investors in the company would pocket a profit of $15.22 for each share they own.