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Sam Altman, Chief Executive Officer of OpenAI, and Mira Murati, Chief Technology Officer of OpenAI, speak during The Wall Street Journal’s WSJ Tech Live Conference in Laguna Beach, California on October 17, 2023. 

Patrick T. Fallon | Afp | Getty Images

Sam Altman’s sudden ouster from OpenAI on Friday shocked Silicon Valley. Not only was Altman, 38, CEO of the hottest startup on the planet, but he had emerged as the face of generative AI after his company’s ChatGPT chatbot went viral late last year.

From the outside, there were some signs of technological challenges at OpenAI, but no indications that tensions were emerging in the boardroom and the C-suite. Altman was still out and about, proselytizing the value of advanced artificial intelligence while also warning of its potential harms and advocating for regulation.

Just last month, reports surfaced that OpenAI was in talks with investors to sell employee shares at an astonishing $86 billion valuation. That’s after tech valuations corrected dramatically over the past 18 months from the decade-long bull market that was fueled by cheap money and a whole lot of FOMO (fear of missing out).

OpenAI was the industry darling in a time of difficulty. Microsoft was pouring in billions of dollars. The company topped CNBC’s Disruptor 50 list, which was published in May. Shortly before the list came out, Altman told CNBC, “I do think we are deep into a new technological wave and this is, I think, the biggest one in a while.”

That all made Altman’s exit hard to fathom and had some in the tech community comparing the move to Apple’s firing of Steve Jobs in 1985. In a statement on its website, OpenAI said, “The board no longer has confidence in his ability to continue leading OpenAI.” The company named Mira Murati, who was the chief technology officer, as interim CEO.

If you followed Altman for the past two weeks, you would’ve seen an industry leader in the center of the action. Here’s an abbreviated timeline of the days leading up to Altman’s departure:

Nov. 6:

Altman took the stage at OpenAI’s DevDay event in San Francisco, where he announced GPT-4 Turbo, the company’s most powerful AI model. Users were also given access to all of OpenAI’s tools, such as its image-generator DALL-E and PDF upload, within ChatGPT.

At the event, Altman said prices for OpenAI’s software would be cut and individual users could customize ChatGPT. He also unveiled an OpenAI app store, an additional way that the company and its investors could monetize its products.

In a surprise appearance, Microsoft CEO Satya Nadella joined Altman on stage to discuss the future of OpenAI and their partnership. Microsoft committed an additional $10 billion earlier this year, the largest AI investment of 2023, according to PitchBook.

“I think we have the best partnership in tech,” Altman told Nadella onstage. “I’m excited for us to build AGI together,” he said, referring to artificial general intelligence.

Nov. 8:

ChatGPT temporarily crashed in the morning. The chatbot told users that “ChatGPT is at capacity right now” and the update page called it a “major outage.” After a little over an hour, the issue was fixed before experiencing difficulties again later in the day.

OpenAI said in the evening that its issues were related to a denial-of-service (DDoS) attack.

“We are dealing with periodic outages due to an abnormal traffic pattern reflective of a DDoS attack,” the company said.

Issues persisted into the next day before being fixed.

Nov. 14:

Altman posted on X, formerly Twitter, that there would be a pause in signing up for ChatGPT Plus. He said there had been a surge in requests after the DevDay announcements and that usage “has exceeded our capacity and we want to make sure everyone has a great experience.”

Nov. 16:

Altman appeared at the Asia-Pacific Economic Cooperation (APEC) summit in San Francisco, speaking on AI.

The OpenAI shake up will not have a major impact on Microsoft, says Jefferies Brent Thill

At 3:28 p.m. ET on Friday, OpenAI published the blog post announcing Altman’s dismissal. At the same time, the company said Greg Brockman, OpenAI’s president, was being stripped of his role as chairman of the board but would stay on as an executive.

Here’s what happened next:

4:46 p.m. ET:

Altman made his first public statement about his departure, writing on X that his experience at the company was “transformative for me personally, and hopefully the world a little bit.”

7:09 p.m. ET:

Brockman announced on X that he’d quit the company “based on today’s news,” and said he was “super proud of what we’ve all built together since starting in my apartment 8 years ago.”

11:42 p.m. ET:

In an X post, Brockman provided a detailed account of Altman’s removal.

He said that on Thursday night, Altman received a text from OpenAI co-founder Ilya Sutskever asking if they could talk the next day at noon. On Friday afternoon, Brockman wrote, Altman joined a Google Meet with OpenAI board members Sutskever, Tasha McCauley, Adam D’Angelo and Helen Toner. Brockman, who was chairman of the board at this time, wasn’t there.

In the meeting, Sutskever told Altman he was out as CEO. Shortly after that, Sutskever informed Brockman he was being removed as chairman but could remain president. OpenAI’s blog post was released at “around the same time,” Brockman wrote.

He said that it appeared Murati only knew of the move the night before. Altman reposted Brockman’s chronicling of the events.

Nov. 18:

Chief Operating Officer Brad Lightcap sent a memo to OpenAI employees addressing the firing. Lightcap said everyone was caught by surprise at the board’s decision and said Murati “has our full support as CEO.”

“We can say definitively that the board’s decision was not made in response to malfeasance or anything related to our financial, business, safety, or security/privacy practices,” Lightcap wrote.

— CNBC’s Jordan Novet contributed to this report

WATCH: OpenAI says Sam Altman exiting as CEO

OpenAI says Sam Altman exits as CEO after board loses confidence

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Tech, semiconductor stocks bounce on tariff optimism, Nvidia jumps 7%

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Tech, semiconductor stocks bounce on tariff optimism, Nvidia jumps 7%

Technology stocks bounced Tuesday after three rocky trading sessions, spurred by rising optimism that President Donald Trump could potentially negotiate tariff deals with world leaders.

Nvidia led the Magnificent Seven group’s gains, rallying about 7%. Meta Platforms, Amazon, Tesla, Apple and Microsoft jumped at least 4% each. Alphabet rose about 3%.

The sector is coming off a wild trading session after speculation that the White House could potentially delay tariffs fueled volatile swings. Alphabet, Meta Platforms, Amazon and Nvidia finished higher, while Apple, Microsoft and Tesla posted losses.

Trump’s wide-sweeping tariff plans have sparked violent turbulence over the last three trading sessions. Trading volume on Monday hit its highest in nearly two decades. Technology stocks gyrated after the Nasdaq Composite posted its worst week in five years and the Magnificent Seven group lost $1.8 trillion in market value over two trading sessions.

Semiconductor stocks also rebounded Tuesday, with the VanEck Semiconductor ETF jumping more than 5% to build on a more than 2% gain from the previous session. Advanced Micro Devices, Lam Research and Micron Technology jumped about 6%.

Chipmakers were excluded from the recent tariffs, but have come under pressure on worries that higher duties could diminish demand for products they are used in and slow the economy. The sector is also expected to see tariffs further down the road.

Elsewhere, Broadcom surged 9% after announcing a $10 billion share buyback plan through the end of the year. Marvell Technology also bounced more than 9% after agreeing to sell its auto ethernet business for $2.5 billion in cash to Infineon Technologies.

WATCH: Tariff volatility erases majority of AI stock gains

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Digital health startup Transcarent takes Accolade private in $621 million deal

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Digital health startup Transcarent takes Accolade private in 1 million deal

Glen Tullman, chairman and chief executive officer at Livongo Health Inc., speaks during the 2015 Bloomberg Technology Conference in San Francisco, California, U.S., on Tuesday, June 16, 2015.

David Paul Morris | Bloomberg | Getty Images

Digital health startup Transcarent on Tuesday announced it completed its acquisition of Accolade in a deal valued at roughly $621 million. 

Transcarent first announced the acquisition in January, and the company said it has received all necessary shareholder and regulatory approvals to carry out the transaction. Accolade shareholders received $7.03 per share in cash, and its common stock will no longer trade on the Nasdaq, according to a release.

“Adding Accolade’s people and capabilities will significantly enhance our existing offerings,” Transcarent CEO Glen Tullman said in a statement. “We’re creating an entirely new way to experience health and care. We are truly better together.” 

Transcarent offers at-risk pricing models to self-insured employers to help their workers quickly access care and navigate benefits. As of May, the company had raised around $450 million at a valuation of $2.2 billion. Transcarent also earned a spot on CNBC’s Disruptor 50 list last year.

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Accolade offers care delivery, navigation and advocacy services. The company went public during the Covid pandemic in 2020 as investors began pouring billions of dollars into digital health, but the stock tumbled in the years following.

Accolade is the latest in a string of digital health companies to exit the public markets as the sector struggles to adjust to a more muted growth environment. 

Transcarent said the executive leadership team will report to Tullman and includes representatives from both organizations. Accolade’s Kristen Bruzek will serve as executive vice president of care delivery operations, for instance.  

Tullman is no stranger to overseeing major deals in digital health. He previously helmed Livongo, which was acquired by the virtual-care provider Teladoc in a 2020 agreement that valued the company at $18.5 billion.

General Catalyst and Tullman’s 62 Ventures led the acquisition’s financing, with additional participation from new and existing investors, the release said. The companies also leveraged cash from their combined balance sheet, and JP Morgan led the debt financing.

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Drone delivery startup Zipline expands to Texas with Walmart partnership

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Drone delivery startup Zipline expands to Texas with Walmart partnership

A drone operator loads a Walmart package into Zipline’s P1 fixed-wing drone for delivery to a customer home in Pea Ridge, Arkansas, on March 30, 2023.

Bunee Tomlinson

Zipline, a startup that delivers everything from vaccines to ice cream via electric autonomous drones, expanded its service to the Dallas area on Tuesday through a partnership with Walmart.

In Mesquite, Texas, about 15 miles east of Dallas, Walmart customers can sign up to receive orders within 30 minutes, delivered on Zipline’s newest unmanned aerial vehicles, known as P2 Zips.

The drones are capable of carrying up to eight pounds worth of cargo within a 10-mile radius, and can land a package on a space as small as a table or doorstep. The company, which ranked 21st on CNBC’s 2024 Disruptor 50 list, plans to expand soon in the Dallas metropolitan area.

Zipline CEO and co-founder Keller Rinaudo Cliffton said P2 Zips have “dinner plate-level” accuracy. They employ lift and cruise propellers and feature a fixed wing that helps them maneuver quietly, even through rain or gusts of wind up to 45 miles per hour.

In the delivery process, a P2 Zip will hover around 300 feet above ground level and dispatch a mini-aircraft with a container called the delivery zip, which descends on a long tether and moves into place using fan-like thrusters before setting down and allowing package retrieval.

Both the P2 Zip and the delivery zip use cameras, other sensors and Nvidia chips to determine what’s happening in the environment around them, and to avoid obstacles while making a delivery.

In March 2025, Zipline announced that its drones have logged more than 100 million autonomous miles of flight to-date, a number equivalent to flying more than 4,000 loops around the planet, or 200 lunar round trips, the company said in a video to mark the milestone.

Since it began operations in 2016, Rinaudo Cliffton said, Zipline has completed around 1.5 million deliveries, far more than competitors in the West. Wing, a Zipline rival focused on residential deliveries, has reported more than 450,000 deliveries since 2012.

Zipline initially focused on logistics in health care, making deliveries by drone to clinics and hospitals in nations where infrastructure sometimes impeded timely access to life-saving medicines, blood, vaccines and personal protective equipment. The company, valued at $4.2 billion in a 2023 financing round, is now making deliveries in Rwanda, Ghana, Nigeria, Côte d’Ivoire, Kenya, Japan and the U.S., and expanded well beyond hospitals and clinics.

In addition to Walmart, customers include Sweetgreen, Chipotle and other quick-serve restaurants, as well as health clinics and hospital systems such as Cleveland Clinic and Mayo Clinic.

Zipline’s launch in Mesquite comes days after President Donald Trump’s announcement of widespread tariffs roiled markets on concern that companies would face rising costs and a slowdown in consumers spending. Rinaudo Cliffton said he doesn’t anticipate massive impediments to Zipline’s business, as its drones are built in the U.S., with manufacturing and testing in South San Francisco.

WATCH: Zipline releases drone for rapid home delivery

Zipline releases new drone designed for rapid home deliveries

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