A timeline of billionaire Elon Musk's bid to control Twitter

Elon Musk threatened Monday to call off his $44 billion acquisition of Twitter, accusing the company of refusing to give him information about spam bot accounts.

Here’s a look at some of what’s transpired between the billionaire Tesla CEO and the social media platform.

March 26: Musk, who has 80 million Twitter followers and is active on the site, said that he is giving “ serious thought ” to building an alternative to Twitter, questioning free speech on the platform and whether Twitter is undermining democracy.

April 4: A regulatory filing reveals that Musk has rapidly become the largest shareholder of Twitter after acquiring a 9% stake, or 73.5 million shares, worth about $3 billion.

April 5: Musk is offered a seat on Twitter’s board. CEO Parag Agrawal said in a tweet that “it became clear to us that he would bring great value to our Board.”

April 11: Twitter CEO Parag Agrawal announces Musk will not be joining the board after all.

April 14: Twitter reveals in a securities filing that Musk has offered to buy the company outright for about $44 billion.

April 15: Twitter’s board unanimously adopts a “poison pill” defense in response to Musk’s proposed offer, attempting to thwart a hostile takeover.

April 21: Musk lines up $46.5 billion in financing to buy Twitter. Twitter board is under pressure to negotiate.

April 25: Musk reaches a deal to buy Twitter for $44 billion and take the company private. The outspoken billionaire has said he wanted to own and privatize Twitter because he thinks it’s not living up to its potential as a platform for free speech.

April 29: Musk sells roughly $8.5 billion worth of shares in Tesla to help fund the purchase of Twitter, according to regulatory filings.

May 5: Musk strengthens his...