OpenAI Is Preparing to File for an IPO. Here's Why It Matters More Than You Think

Picture two supertankers trying to dock in the same harbor at the same time. That’s basically what Wall Street is facing right now.

On May 20th, SpaceX filed its S-1 prospectus with the SEC. Within 24 hours, Reuters and the Wall Street Journal reported that OpenAI is preparing its own confidential IPO filing. Two companies. One window. Combined new equity supply could approach $135 billion. This isn’t just a big deal — it’s a test of whether public markets can swallow the biggest wealth event in Silicon Valley history.

The OpenAI Filing: What We Know

OpenAI is working with Goldman Sachs and Morgan Stanley on a draft prospectus. The company aims to go public as early as September 2026 at a valuation that could exceed $1 trillion. Its last private funding round in February closed at $852 billion post-money, but the public market story is supposed to be bigger — and that’s where things get interesting.

CFO Sarah Friar confirmed in January that the company’s annualized revenue rate exited 2025 above $20 billion, against estimated full-year actual revenue of roughly $13.1 billion. That distinction matters: annualized run rate is a forecast tool, audited revenue in an S-1 is the real thing. Investors will finally see what OpenAI actually earned in 2025, not what it projected it would earn going forward.

The Musk Lawsuit Disappearance

Just two days before the IPO report dropped, a California jury dismissed all claims in Elon Musk’s lawsuit against OpenAI under the statute of limitations. Musk announced plans to appeal, but the immediate legal overhang was removed. IPOX Vice President Kat Liu noted this “likely gave OpenAI the confidence to accelerate its timeline.”

Think of it like finally getting the green light after three years of red tape. OpenAI had been preparing for this for months, but the lawsuit was a cloud. Now it’s clearing.

The Real Questions the S-1 Will Answer

Here’s what every investor will be hunting for in that filing:

1. How much is OpenAI actually burning? The company remains deeply unprofitable. The filing will detail exactly how much cash goes toward training models, serving responses on cloud infrastructure, building data center capacity, and hiring talent that costs more per head than most Fortune 500 companies’ entire tech departments. When does the burn rate start trending down? That’s the billion-dollar question — literally.

2. What are the unit economics? Here’s where AI differs fundamentally from traditional software. When Spotify adds a user, the marginal cost is basically zero. When OpenAI serves a token to ChatGPT, it burns GPU compute every single time. If usage grows 10x, costs grow too — unless efficiency gains outpace demand. The S-1 may not spell this out perfectly, but any window into model-serving costs will be gold.

3. Who gets rich? Microsoft owns roughly 27% of OpenAI’s public benefit corporation structure. At a $1 trillion valuation, that’s $270 billion. OpenAI president Greg Brockman has testified his holdings are worth nearly $30 billion. The ownership breakdown in the S-1 will show exactly how much employee wealth is already baked in versus how much dilution new public investors absorb.

4. The revenue mix? The Information reported OpenAI generated nearly $6 billion in revenue in Q1 alone. But what portion comes from ChatGPT subscriptions (50 million+ consumer subscribers, 900 million weekly active users) versus API calls to developers? That split determines whether OpenAI is a consumer brand or an infrastructure play — or both.

Why This Tests the Whole Industry

OpenAI’s IPO isn’t happening in a vacuum. It’s the canary in the coal mine for every AI company planning to go public. Anthropic is reportedly preparing its own IPO later this year. Cerebras went public in May. If public markets are willing to back OpenAI at a trillion-dollar valuation despite massive losses, the floodgates open. If they balk, watch what happens to Anthropic’s timing.

Public market investors have tolerated money-losing tech companies before. Amazon was unprofitable for years after its IPO. Spotify took the same route. But WeWork taught everyone that transparency can be unforgiving when the numbers don’t lie. OpenAI’s S-1 will be the most scrutinized financial document in AI history, and every number will be cross-checked against every competitor’s claims.

What to Watch

The confidential filing date: Companies file confidentially and can take weeks or months before making the S-1 public. But the 15-day rule before the road show means timing is already locked in somewhere.
The valuation range: $852 billion was the private round. $1 trillion is the public market story. The actual pricing will depend on market conditions and investor appetite in August-September.
How the market reacts: Every AI IPO since 2024 has been treated as a referendum on whether the AI infrastructure narrative still has legs. OpenAI’s will be the most important one yet.

The filing won’t tell us if OpenAI will be the next Amazon. But it will tell us whether Wall Street still believes in the AI race — and that’s worth watching.

Quiz Time

1. What was OpenAI’s valuation in its last private funding round before the IPO? A) $500 billion B) $750 billion C) $852 billion D) $1 trillion

2. Which two investment banks are advising OpenAI on its IPO? A) Goldman Sachs and JPMorgan B) Morgan Stanley and Bank of America C) Goldman Sachs and Morgan Stanley D) Goldman Sachs and Citigroup

3. What key legal overhang was removed on May 18, 2026, that may have accelerated OpenAI’s IPO timeline? A) The EU antitrust investigation B) The California jury dismissing Elon Musk’s lawsuit C) The SEC approval of the dual-class share structure D) The Department of Justice consent decree

Answers

C — $852 billion (February 2026 funding round)
C — Goldman Sachs and Morgan Stanley
B — A California jury dismissed all claims in Elon Musk’s lawsuit against OpenAI under the statute of limitations