Who is OpenAI's Auditor?

OpenAI won't say who audits its books. The company, which projects to hit an ARR of $20 billion this year and is valued at $500 billion, has committed to spending about $1.4 trillion on data centers over the next decade. It accounts for roughly two-thirds of unfulfilled contracts at Oracle and two-fifths at CoreWeave. Microsoft alone holds around $375 billion in unfulfilled contracts with OpenAI.
Reuters reported the company may target a $1 trillion valuation for a potential IPO in coming years.