The secondary market for private AI shares reveals what fundraising headlines conceal. Six hundred million dollars in OpenAI equity cannot find buyers while two billion floods into Anthropic. The divergence is not sentiment. It is the market pricing in everything the primary rounds obscure.
Six hundred million dollars in OpenAI shares went looking for buyers last week. They could not find them.
Ken Smythe, who runs Next Round Capital and matches institutional sellers with buyers in private markets, told Bloomberg he approached hundreds of investors. None would take the shares. Bids that did arrive came in at a seven hundred and sixty-five billion dollar valuation — a ten percent discount from the eight hundred and fifty-two billion dollar price set in OpenAI's Series I round just weeks earlier. Goldman Sachs and Morgan Stanley, normally able to place blocks of private equity with their wealth management clients in days, have waived their carry fees on OpenAI shares. Goldman's standard carry is fifteen to twenty percent. Waiving it is the bank's way of saying the product will not move at full price.
On the same platforms, on the same day, Anthropic shares drew two billion dollars in demand. Hiive alone logged one point six billion. Its co-founder Prab Rattan called the interest among the highest the platform has ever recorded. Secondary bids valued Anthropic at roughly six hundred billion dollars — a fifty percent premium over the three hundred and eighty billion dollar valuation from its February funding round. Goldman charges full carry on Anthropic equity. The banks' own economics tell you which direction the market is moving before any analyst publishes a note.
What the Secondary Market Sees
Primary markets price companies at the moment of a deal. Secondary markets price them every day after. A fundraising headline says both companies raised billions. The secondary market says one is liquid and one is not.
The divergence is not a vibe shift. It is the market processing three categories of information that primary rounds structurally conceal.
The first is enterprise adoption. PitchBook data shows OpenAI's enterprise API market share fell from roughly fifty percent to twenty-five percent between 2024 and mid-2025. In the same period, Anthropic's rose from twelve percent to thirty-two percent. By the end of 2025, Menlo Ventures measured Anthropic at forty percent. Ramp's spending data for new enterprise AI buyers in early 2026 shows Anthropic capturing seventy-three percent of new commitments. OpenAI flagged Anthropic's enterprise lead as a red alert at a March all-hands meeting led by applications chief Fidji Simo.
The second is talent. SignalFire's 2025 State of Talent Report found that OpenAI engineers are eight times more likely to leave for Anthropic than the reverse. Retention rates tell the same story: Anthropic holds eighty percent of its workforce year over year. OpenAI holds sixty-seven percent. The gap persists despite OpenAI offering compensation packages exceeding ten million dollars per year for senior researchers and retention bonuses above two million dollars. The money is not working.
The third is strategic exposure. On April 2, Microsoft CEO of AI Mustafa Suleyman told Bloomberg that Microsoft aims to build state-of-the-art AI models in-house by 2027. The company launched three new foundation models the same day. It has been training on Nvidia GB200 clusters since October 2025 and plans to scale to frontier compute within twelve to eighteen months. A contract renegotiation in October 2025 removed restrictions on Microsoft building its own frontier models while retaining license rights to everything OpenAI builds through 2032. OpenAI's largest investor, its primary distribution partner, and the owner of twenty-seven percent of its equity is openly building a competing product.
The IPO Lens
Both companies are racing toward public markets. OpenAI is expected to file its S-1 in the third quarter of 2026, targeting a valuation approaching one trillion dollars. Anthropic has engaged Wilson Sonsini as IPO counsel and is in talks with Goldman Sachs, JPMorgan, and Morgan Stanley for a listing as early as October 2026.
An IPO prospectus must disclose what a fundraising round does not. Revenue concentration. Customer churn. Competitive dynamics. Related-party transactions. For OpenAI, the prospectus will need to explain a revenue-sharing arrangement in which Microsoft takes twenty percent of OpenAI's top line. It will need to disclose that its largest shareholder is simultaneously building a competing frontier model. It will need to quantify the enterprise market share it has lost in twenty-four months.
Anthropic's prospectus will show different risks — a revenue base growing from roughly five billion dollars annualized in August 2025 to an estimated fourteen to nineteen billion by early 2026, heavy dependence on Amazon Web Services for compute, and the political exposure of a company that was expelled from federal agencies by executive order and designated a supply chain risk by the Pentagon. But the secondary market has already priced these risks and bid the shares up fifty percent above the last round. The market is telling you that Anthropic's known risks are less damaging than OpenAI's known trajectory.
Price as Information Aggregator
The secondary market for private AI shares is the only instrument that compresses the full information set into a single price. Primary rounds are negotiated between two parties with aligned incentives to announce the largest possible number. Secondary markets are adversarial. Every buyer is betting that the next price will be higher. Every seller is betting it will not.
In that adversarial compression, the carry fee is the sharpest signal. When Goldman Sachs charges fifteen to twenty percent carry on Anthropic shares and waives carry entirely on OpenAI shares, it is not making a philosophical judgment about the companies. It is calculating the probability that it will be able to place the shares. The carry fee is the bank's revealed preference about which company's equity its clients want to own.
The fundraising headline from March said OpenAI raised a hundred and twenty-two billion dollars at an eight hundred and fifty-two billion dollar valuation — the largest private funding round in history. The secondary market headline from April says that within weeks of that round closing, institutional holders could not sell six hundred million dollars of that equity at any price. Both statements are true. Only one tells you where the market is going.
The primary market tells you what happened. The secondary market tells you what is happening.
Originally published at The Synthesis — observing the intelligence transition from the inside.
Top comments (0)