A leading e-commerce executive will soon head OpenAI’s applications business.

Fidji Simo, the CEO of Instacart, aged 39, shared in a LinkedIn update on Wednesday that she is set to depart the grocery delivery platform. She will be taking on the role of CEO of Applications at OpenAI later this year. In this capacity, she will oversee OpenAI’s products, including ChatGPT, and will report directly to Sam Altman, the company’s CEO, who is 40.

Simo mentioned that she intends to stay on as CEO of Instacart “for a couple of months” to ensure a seamless transition. Despite her departure, she will continue to serve as the chair of Instacart’s board.

“I’d like to begin by expressing that this was an incredibly tough choice because I am passionate about this company,” Simo stated in her LinkedIn update, which mirrored a message she had sent to the Instacart staff.

Simo wrote that her “passion for AI” and “the potential it has to cure diseases” persuaded her to join OpenAI. Wired reported on Wednesday that OpenAI is in talks with the FDA to use AI for drug evaluations, potentially speeding up the time it takes for a drug to hit the market. Simo, meanwhile, is co-founder and president of a medical research center called Metrodora, which focuses on diagnosing and treating neuroimmune disorders.

“The ability to lead such an important part of our collective future was a hard opportunity to pass up,” Simo stated.

In an OpenAI blog post on Wednesday, Altman wrote that Simo, who joined OpenAI’s board last year, had “already contributed a great deal” to the company. He did not provide specific examples of Simo’s contributions, but wrote that she would now be responsible for helping lead the company through a new phase of growth. In March, OpenAI finalized a $40 billion fundraising round that valued the company at $300 billion. This week, OpenAI announced that its non-profit arm would continue to control its for-profit business to ensure OpenAI’s mission of AI that “benefits all of humanity.”

The Applications division is one of OpenAI’s three core businesses (Research and Compute and the other two). Altman wrote in a post on X that Simo’s appointment means he can focus more on research as the company works towards superintelligence, AI that surpasses human intelligence in all areas.

so excited that @fidjissimo is joining openai in a new role: ceo of applications, reporting to me.

i’ll remain ceo of openai, but in this new configuration i’ll be able to increase my focus on research, compute, and safety.

these are critical as we approach superintelligence.

— Sam Altman (@sama) May 8, 2025

Bloomberg reports that OpenAI’s Chief Operating Officer Brad Lightcap, Chief Financial Officer Sarah Friar, and Chief Product Officer Kevin Weil will report to Simo when she joins OpenAI.

Simo has been the CEO of Instacart since 2021, leading the company through the pandemic and to a September 2023 initial public offering. Since the company went public, Instacart shares have grown by over 47% at the time of writing. The company saw its first quarter revenue for 2025 increase 9% year-over-year to $897 million, with order volume up 14%.

Before Instacart, Simo worked at Meta for a decade and held the role of vice president and head of the Facebook app from 2019 to 2021. She introduced ads to the Facebook app and built Facebook Live, overseeing a team of 6,000 people.