OpenAI is losing its second-in-command at arguably the worst possible moment. Fidji Simo, the company’s president overseeing product and business operations, announced a medical leave of absence in early April 2026 due to a neuroimmune condition, stepping away from daily operations just as the company barrels toward what could be the most consequential tech IPO in years.

OpenAI confidentially filed IPO paperwork with the SEC around June 8, 2026, and the company is now navigating the messy reality of going public without the executive who was effectively running the business side of the operation.

A leadership deck that keeps getting reshuffled

Simo’s departure didn’t happen in isolation. Around the same time in April 2026, longtime COO Brad Lightcap transitioned out of his operational role and into a special projects position focused on complex deals and investments, reporting directly to CEO Sam Altman.

CMO Kate Rouch also exited around April 2026, adding yet another name to a growing list of senior departures.

Reports indicate Simo had been prioritizing work over treatment for her neuroimmune condition.

The trillion-dollar question

OpenAI’s internal discussions have considered delaying the IPO to 2027 to give the company more time to hit the $1 trillion mark.

CFO Sarah Friar has reportedly expressed concerns about the company’s readiness for a 2026 public debut. CEO Sam Altman has acknowledged that while he does not express excitement about leading a public company, he recognizes an IPO as a necessary financing step that could take place roughly a year from mid-2026.

The confidential SEC filing keeps options open, as no specific timeline for the IPO has yet been established.

What this means for investors and the broader AI market

This isn’t one executive leaving for a better opportunity. It’s a president on medical leave, a COO shifted to a side role, a CMO gone entirely, and a CFO voicing readiness concerns, all within the same window.

OpenAI has been transitioning to a for-profit structure since 2025, which allows for traditional fundraising avenues, including a potential IPO. The company has already raised tens of billions in recent funding rounds.

OpenAI’s IPO, whenever it happens, will set the benchmark for how public markets value generative AI companies, with competitors like Anthropic and xAI also positioning themselves for eventual public listings.