Fidji Simo

Overview

Fidji Simo is a technology executive who has led product and business organizations at consumer internet companies. In May 2025 she was named chief executive of Applications at OpenAI, leaving her post as chief executive of Instacart to take the role ^[1]. CNBC described her position at OpenAI as its "product and business chief" ^[2]. She held that job until July 2026, when she stepped down because of illness ^[2].

Career before OpenAI

Simo spent more than a decade at Meta, where she exited as head of the Facebook app ^[1]. In 2021 she joined Instacart ^[1], and she was serving as its chief executive when OpenAI announced her appointment ^[1].

She was not a newcomer to OpenAI when she took the Applications job: she had served as a member of the company's board for the past year before taking the role ^[1]. That board experience meant she arrived already familiar with the organization's leadership and decision-making, before moving from oversight into an operating job.

The move to OpenAI

TechCrunch reported the appointment on 7 May 2025 ^[1]. Because Simo was running another company at the time, the change was not immediate. In a blog post quoted by TechCrunch, OpenAI chief executive Sam Altman said she would transition out of Instacart over the next few months and join OpenAI later that year ^[1].

The title itself was notable. Chief executive of Applications describes a leader responsible for the products OpenAI builds and operates, a role distinct from its research work. CNBC's shorthand, "product and business chief," captured the same idea ^[2]. Simo's background was in consumer applications rather than in machine learning research, and the job placed her at the head of the part of OpenAI that turns models into products people use.

Stepping down

On 9 July 2026, Simo announced that she was stepping down from her OpenAI role to focus on recovery after what she called a "severe exacerbation of a chronic illness" ^[2]. She said she would transition into a part-time advisor role at OpenAI rather than leave the company entirely ^[2].

Her public statement framed the change as a health-driven reduction in duties rather than a break with the company, since the advisory arrangement kept her formally connected to OpenAI ^[2].

How her tenure is recorded

Simo's time at OpenAI is documented by a short sequence of dated announcements: a product leadership hire reported in May 2025, a planned handover from Instacart over the following months, and a departure announced in July 2026 ^[1][2]. Together they record how OpenAI placed a named chief executive over its application business, and how that arrangement changed when the executive could no longer continue at full capacity ^[1][2].