OpenAI’s No. 2 Executive Fidji Simo Steps Down, Creating Leadership Void Ahead of Potential IPO

Fidji Simo, OpenAI’s second-highest-ranking executive, is stepping down from her full-time role after a prolonged medical leave, according to a staff note reported by the Wall Street Journal. Simo will transition to a part-time advisory role, leaving CEO Sam Altman with a significant leadership gap as the company prepares for a potential initial public offering and intensifies competition with Anthropic.

A Sudden Departure After a Brief Tenure

Simo joined OpenAI’s board in 2024 and assumed the newly created role of CEO of Applications in May 2025, reporting directly to Altman. Her role consolidated the company’s business and product operations, with COO Brad Lightcap, CFO Sarah Friar, and CPO Kevin Weil all reporting to her. This allowed Altman to focus more on research, compute, and safety. However, Simo’s tenure was cut short by health issues. She first disclosed a relapse of a neuroimmune condition in April, when she announced her medical leave. In that same memo, the company revealed that Lightcap had moved into a new “special projects” role and CMO Kate Rouch was leaving for cancer recovery. Weil has since left the company as well.

Implications for OpenAI’s Leadership and IPO Plans

Simo’s decision to step back permanently creates a real void for Altman to fill. She had been widely seen as a strong candidate to take on more responsibility once OpenAI went public. Her departure comes at a critical time: OpenAI is racing to close the enterprise gap with Anthropic and is eyeing an IPO. Simo was primarily focused on growing OpenAI’s consumer business, particularly ChatGPT. However, ChatGPT’s growth cooled late last year, missing internal revenue targets. This has pushed the company to lean harder into coding tools, an area where it still trails Anthropic.

Why This Matters to the AI Industry

The departure of a key executive with deep operational experience — Simo previously led Instacart through its 2023 IPO and spent over a decade at Meta running the Facebook app — raises questions about OpenAI’s ability to maintain momentum. The company is already navigating a series of high-level exits, including Weil and Rouch. Altman now faces the challenge of finding a successor who can manage both business and product operations while maintaining investor confidence ahead of a public offering.

Conclusion

Fidji Simo’s transition to an advisory role marks a significant leadership change at OpenAI, adding uncertainty as the company pursues an IPO and battles for enterprise AI dominance. Altman’s search for a new No. 2 will be closely watched by investors and industry observers alike.

FAQs

Q1: Why is Fidji Simo leaving OpenAI?
She is stepping down from her full-time role due to a prolonged medical leave related to a relapse of a neuroimmune condition. She will remain as a part-time advisor.

Q2: What was Fidji Simo’s role at OpenAI?
She served as CEO of Applications, a role created in May 2025, overseeing business and product operations. She reported directly to CEO Sam Altman.

Q3: How does this affect OpenAI’s IPO plans?
Simo was considered a likely candidate to take on more responsibility after an IPO. Her departure creates a leadership gap that Altman must fill, adding uncertainty as OpenAI prepares for a public offering.