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A board seat accepted and then rejected. A stunning $44 billion takeover offer with uncertain financing. And a surprise early morning tweet putting the deal on hold, temporarily.

Even by the standards of Twitter, a company that has known plenty of chaos and dysfunction in its history, the weeks-long effort by billionaire Elon Musk to buy the company has proven to be uniquely tumultuous – and there’s no clear end in sight.

Should the deal go through, it would place the world’s richest man in charge of one of the world’s most influential social media platforms. The acquisition has the potential to upend not just Twitter itself but politics, media and the tech industry. The Tesla and SpaceX CEO has repeatedly stressed that his goal is to bolster what he calls “free speech” on the platform, by which he means all legal speech that complies with local laws in the markets where Twitter operates. He has also said he would reverse Twitter’s ban of former President Donald Trump.

But the attempt by Musk, a wildly successful entrepreneur with a history of erratic behavior, to buy Twitter has been viewed with some skepticism from the start. On the day he made his offer, Musk said: “I’m not sure I’ll actually be able to acquire it.” Some have questioned how he would finance the deal, especially as shares of Tesla (TSLA), which he’s partially using to back his financing of the Twitter deal, and the broader tech sector have declined in the weeks since.

After Musk recently said he was temporarily pausing the deal so he could assess the amount of spam and fake accounts, it prompted speculation that the billionaire might be looking to renegotiate the deal – or back out of it entirely. His actions in the days that followed only reinforced that thinking.

Here is a look back at the many twists and turns in one of the most high-profile tech deals in recent memory.

January 31: Musk begins building up his Twitter stake

Musk starts quietly buying up Twitter shares, building his stake in the company. But it would be months before he disclosed this fact to the public.

March 14: Musk’s Twitter stake tops 5%

Musk’s stake in Twitter tops 5%, but that fact is not disclosed until the following month. Musk was obligated to disclose his stake within 10 days of crossing the 5% threshold, but waited 21 days to do so. During that time, he continued building up his stake.

March 24: Asking whether Twitter should change

The billionaire begins to make pointed statements about the platform from his account. “Twitter algorithm should be open source,” he wrote, with a poll for users to vote “yes” or “no.”

The following day, Musk tweets out another poll to his followers: “Free speech is essential to a functioning democracy. Do you believe Twitter rigorously adheres to this principle?”

A sign is posted on the exterior of Twitter headquarters on April 27, 2022 in San Francisco, California.

March 26: Musk reaches out to Jack Dorsey

Musk reaches out to Twitter cofounder and former CEO Jack Dorsey to “discuss the future direction of social media,” according to a company filing later put out by the company. The two tech founders are known to have a bit of a billionaire bromance on and off Twitter.

April 3: Twitter leadership meets to discuss Musk

Twitter’s board and some of its leadership team meet with representatives from Wilson Sonsini, a law firm, and J.P. Morgan to discuss the possibility of Musk joining the company’s board, according a later securities filing. Dorsey is said to have told the board that “he and Mr. Musk were friends,” according to the filing.

In the meeting, the Twitter board discussed wanting Musk to agree to “‘standstill’ provisions”,” according to the filing. This would effectively “limit his public statements regarding Twitter, including the making of unsolicited public proposals to acquire Twitter (but not private proposals) without the prior consent of the Twitter Board.”

April 4: Surprise! Musk becomes Twitter’s largest shareholder

Musk is revealed to be Twitter’s largest individual shareholder, with a more than 9% stake in the company.

News of the purchase sends shares of the social media company soaring more than 20% in early trading and kicks off a wave of speculation about how Musk might push for changes on the platform.

April 5: Musk agrees to join the board

Twitter CEO Parag Agrawal announces Musk will join Twitter’s board of directors. “Through conversations with Elon in recent weeks, it became clear to us that he would bring great value to our Board,” Agrawal says in a post on Twitter.

As part of the appointment, Musk agrees not to acquire more than 14.9% of the company’s shares while he remains on the board. His term on the board is set to go through 2024, according to a regulatory filing.

Twitter CEO Parag Agrawal (left) and former CEO Jack Dorsey in an undated photo.

April 10: Just kidding. Musk ditches the board

Agrawal announces that Musk has decided not to join the board after all. “I believe this is for the best,” Agrawal writes in a letter to the Twitter team.

The reversal opens the door for Musk to pursue a greater stake in the company – and frees him to tweet his many thoughts about the company.

April 14: Musk offers to buy Twitter and ‘unlock’ its potential

Musk stuns the industry by making an offer to acquire all the shares in Twitter he does not own at a valuation of $41.4 billion. The cash offer represents a 38% premium over the company’s closing price on April 1, the last trading day before Musk disclosed that he had become the company’s biggest shareholder.

“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,” Musk writes in his offer letter. “Twitter has extraordinary potential. I will unlock it.”

April 15: The poison pill

Twitter’s board of directors adopts a “poison pill” provision, a limited-term shareholder rights plan that potentially makes it harder for Musk to acquire the company.

Tesla CEO Elon Musk speaks during the official opening of the new Tesla electric car manufacturing plant on March 22, 2022 near Gruenheide, Germany.

April 21: Musk lines up $46.5 billion in financing

Musk lines up $46.5 billion in financing for the deal, including two debt commitment letters from Morgan Stanley and other unnamed financial institutions and one equity commitment letter from himself, according to a regulatory filing.

The billionaire also reveals that he has not received a formal response from Twitter a week after his acquisition offer. He said he is “seeking to negotiate” a definite acquisition agreement and “is prepared to begin such negotiations immediately” — an apparent reversal from his statement in his acquisition offer letter that it would be his “best and final” offer.

Although he is the richest person in the world, much of Musk’s wealth is tied up in Tesla stock, and some followers of the company speculate that it could be challenging for Musk to raise debt against the historically volatile stock.

April 25: Twitter agrees to sell itself to Elon Musk

Twitter announces that it has agreed to sell itself to Musk in a deal valued at around $44 billion. At a conference later in the day, Musk describes his offer to buy Twitter in characteristically sweeping terms as being about “the future of civilization,” not just making money.

At an all-hands meeting that afternoon, Twitter employees raise questions about everything from what the deal would mean for their compensation to whether former US President Donald Trump would be let back on the platform.

April 29: Musk cashes out billions in Tesla stock

Filings reveal Musk sold $8.5 billion of his Tesla stock in the three days after Twitter board agreed to the sale for an average of $883.09 per share. The filings did not disclose the reason for the sale, but Musk appeared to be raising funds to buy Twitter.

Tesla cars sit in a dealership lot on March 28, 2022 in Chicago, Illinois.

May 4: With a little help from his billionaire friends

Musk raises another $7 billion in financing for the deal. The new investors include Oracle founder Larry Ellison, cryptocurrency platform Binance and venture capital firm Sequoia Capital, according to a filing.

May 6: Musk’s lofty goals for Twitter, revealed

Musk aims to increase Twitter’s annual revenue to $26.4 billion by 2028, up from $5 billion last year, according to a New York Times report, citing Musk’s pitch deck presented to investors. To achieve that lofty goal, Musk intends to bolster Twitter’s subscription revenue and build up a payments business while decreasing the company’s reliance on advertising sales, according to the report.

May 10: Musk says he would reinstate Trump’s account

Musk confirms what many have assumed for weeks: he would reverse Twitter’s Trump ban if his deal to buy the company is completed.

“I do think it was not correct to ban Donald Trump, I think that was a mistake,” Musk said. “I would reverse the perma-ban. … Banning Trump from Twitter didn’t end Trump’s voice, it will amplify it among the right and this is why it’s morally wrong and flat out stupid.”

Former President Donald Trump looks at his phone during a roundtable with governors on the reopening of America's small businesses, in the State Dining Room of the White House in Washington, June 18, 2020.

May 12: A partial hiring freeze and executive departures

Twitter confirms to CNN Business that the platform is pausing most hiring and backfills, except for “business critical” roles, and pulling back on other non-labor costs ahead of the acquisition. In addition, Twitter says general manager of consumer, Kayvon Beykpour, and revenue product lead, Bruce Falck, are leaving the company.

May 13: Twitter deal ‘temporarily on hold’

Musk tweets that the deal is on hold, linking to a Reuters report from nearly two weeks earlier, about Twitter’s most recent disclosure about its amount of spam and fake accounts. The figure cited in the report, however, is in line with prior quarterly disclosures.

“Twitter deal temporarily on hold pending details supporting calculation that spam/fake accounts do indeed represent less than 5% of users,” Musk tweeted.

Shares of the social media site plummet after Musk’s announcement, dropping more than 10% at market open. Two hours after announcing the hold, Musk says he remains set on purchasing Twitter. “Still committed to acquisition,” he wrote.

Later in the day, Musk says his team is testing Twitter’s numbers and “picked 100 as the sample size number, because that is what Twitter uses to calculate <5% fake/spam/duplicate.”

May 14: Oops. NDA problems?

Musk tweets out that Twitter’s legal team accused him of breaking a nondisclosure agreement when the billionaire revealed the platform’s sample size for automated user checks is allegedly just 100 users.

“Twitter legal just called to complain that I violated their NDA by revealing the bot check sample size is 100! This actually happened,” wrote Musk.

May 16: Poop emoji

The standoff over bot accounts continues as Musk exchanges a series of tweets with Agrawal over the issue. After Agrawal carefully explains how Twitter attempts to combat and measure spam accounts, Musk responds with a poop emoji.

Musk follows up with a somewhat more thoughtful question. “So how do advertisers know what they’re getting for their money?” Musk asked. “This is fundamental to the financial health of Twitter,” he added.

May 17: Musk says Twitter deal ‘cannot move forward.’ Twitter disagrees

Musk announces that his acquisition of Twitter “cannot move forward” until he sees more information about the prevalence of spam accounts, claiming that the social media platform falsified numbers in filings. Without citing a source, he claims in a tweet that Twitter is “20% fake/spam accounts” and suggests Twitter’s previous filings with the SEC were misleading.

Later in the day, Musk posts a poll to his Twitter followers: “Twitter claims that >95% of daily active users are real, unique humans. Does anyone have that experience?” before calling on the SEC to evaluate the platform’s numbers. “Hello @SECGov, anyone home?” Musk tweets, in an apparent attempt to get the regulator to look into the matter.

In a statement, Twitter says it remains “committed to completing the transaction on the agreed price and terms as promptly as practicable.” Later, the company says it intends to “enforce the merger agreement.”

June 6: A threat to walk away

In a letter to Twitter’s head of legal, Musk threatens to walk away from his purchase of the platform, alleging that Twitter is “actively resisting and thwarting his information rights” as outlined by the deal.

In the letter, an attorney for Musk accuses the social media company of breaching the merger agreement by not providing the data he has requested on Twitter spam bots, stating that the lack of information gives him a right “not to consummate the transaction” and “to terminate the merger agreement.”

July 8: Actually trying to walk away

Musk moved to terminate the acquisition agreement. A lawyer representing him claimed in a letter to Twitter’s top lawyer that the company is “in material breach of multiple provisions” of the deal over its alleged failure to provide all the data Musk says he needs to evaluate the number of spam and fake accounts on the platform.

“For nearly two months, Mr. Musk has sought the data and information necessary to ‘make an independent assessment of the prevalence of fake or spam accounts on Twitter’s platform,’” the letter reads. “This information is fundamental to Twitter’s business and financial performance and is necessary to consummate the transactions contemplated by the Merger Agreement. … Twitter has failed or refused to provide this information.”

Twitter was not having it.

“The Twitter Board is committed to closing the transaction on the price and terms agreed upon with Mr. Musk and plans to pursue legal action to enforce the merger agreement,” Twitter board chair Bret Taylor said in a tweet Friday, echoing earlier statements by the company that it planned to follow through with the deal. “We are confident we will prevail in the Delaware Court of Chancery.”

July 12: Twitter sues Musk

Twitter sued the Tesla billionaire in Delaware court in an attempt to force him to complete the deal.

The 62-page lawsuit, sprinkled with memes, tweets and a poop emoji, effectively highlighted the bizarre spectacle of the deal from the start. The company paints Musk as a non-serious potential owner — alleging at one point that he has “disdain” for the company, and at another saying, “Musk’s strategy is … a model of bad faith” — while seeking to compel him to become its owner. (Twitter’s board has an obligation to its shareholders to try to see the deal through if they believe it is in their best interest. The dispute could also end in a settlement.)

July 29: Save the date

Twitter’s lawsuit against Musk over his move to terminate their $44 billion acquisition agreement will go to trial on Oct. 17 and run for five days, a Delaware judge ruled.

The decision came after Judge Kathaleen St. Jude McCormick, who is overseeing the case, previously ruled in Twitter’s favor that the proceedings could be expedited and take place in October. Twitter initially pushed for an October 10th start.

Musk’s legal team had asked for the trial to take place in 2023. Twitter’s legal team argued it was necessary to expedite the case in order to limit the “harm” to its business and to ensure the deal can be completed before Oct. 24, the “drop dead” date by which the two sides had previously agreed to close the deal.

Peiter "Mudge" Zatko, former head of security at Twitter, is sworn-in as he testifies before the Senate Judiciary Committee on data security at Twitter, on Capitol Hill, September 13, 2022 in Washington, DC. Zatko claims that Twitter's widespread security failures pose a security risk to user's privacy and information and could potentially endanger national security.

September 13: Whistleblower testifies before Congress

Twitter whistleblower Peiter “Mudge” Zatko testifies before Congress in his first public appearance after his bombshell allegations against the social media company were reported in August by CNN and The Washington Post.

In a whistleblower disclosure sent to multiple lawmakers and government agencies in July, Zatko accused Twitter of failing to safeguard users’ personal information and of exposing the most sensitive parts of its operation to too many people, including potentially to foreign spies. Zatko — who was Twitter’s head of security from November 2020 until he was fired in January — also alleged company executives, including CEO Parag Agrawal, have deliberately misled regulators and the company’s own board about its shortcomings.

Zatko claimed in his testimony that Twitter is extremely vulnerable to being penetrated and exploited by agents of foreign governments, as well as detailed some of the personal information Twitter collects on users and alleged that the company does not know where the majority of its collected data goes.

Days earlier, a judge allowed Musk’s legal team to add arguments based on the whistleblower disclosure to its case.

October 3: Musk wants Twitter at the full price?

Musk sends a letter to Twitter proposing to complete the deal as originally signed for $54.20 per share, citing people familiar with the negotiations. News of the letter, revealed in a security filing the next day, sends Twitter stock surging more than 20%, approaching the deal price for the first time in months.

Such an agreement could bring to an end a contentious, months-long back and forth between Musk and Twitter that has caused massive uncertainty for employees, investors and users of one of the world’s most influential social media platforms.

October 6: The clock is officially ticking

Musk has until October 28 to close his acquisition of Twitter or face a trial that was previously delayed to allow both parties to close the deal, Judge McCormick rules.

“If the transaction does not close by 5 p.m. on October 28, 2022, the parties are instructed to contact me by email that evening to obtain November 2022 trial dates,” the judge said in the order.

October 27: Elon now owns Twitter

Musk completes his $44 billion deal to buy Twitter, according to a source familiar with the matter. Musk immediately fired Agrawal, CFO Ned Segal and policy head Vijaya Gadde, according to sources.

Musk appeared to acknowledge the takeover in a tweet saying, “the bird is freed.”

CNN’s Clare Duffy, Chris Isidore, Brian Fung, Rishi Iyengar, Brian Stelter and Allison Morrow contributed to this report.