Anthropic share frenzy exposes the risks in the private AI secondary market

On Thursday, the scramble for Anthropic shares before a public listing started to look less like ordinary venture exuberance and more like a warning about the private AI secondary market. Fortune reported that roughly $1 trillion of capital was chasing only $30 billion to $50 billion of stock, while Anthropic separately reminded buyers that unauthorized sales or transfers would not be recognised on its books.

For buyers, the frenzy is no longer only about whether Anthropic can keep compounding revenue fast enough to justify its latest private valuation. Legal rights matter now as much as growth. Access, transferability and fee layers are moving to the centre because a scarce pre-IPO asset is being sold through structures that can obscure who owns what. Public markets bury that plumbing in the background. Private AI is putting it on the front page.

Fortune’s reporting captured the imbalance bluntly:

“Anthropic has all this clumped-up, pent-up demand, and it’s like a pressure cooker ready to explode.”

— Hari Raghavan, quoted by Fortune

Scarcity is becoming the product

Private-company secondaries have always relied on scarcity. Yet Anthropic’s case looks more extreme because buyers are not just underwriting software growth. They are underwriting a scarce claim on the company that might set the reference price for the rest of the AI IPO queue. Bloomberg Technology reported earlier this week that Anthropic’s efforts to police its cap table sent a jolt through the pre-IPO market, a sign that access itself has started trading like a premium product.

SPVs and side deals fill that gap. For institutions shut out of a primary round, pooled vehicles promise a way in. For brokers and intermediaries, they also create room for fees, layered disclosure and a blurred line between genuine ownership and economic exposure that depends on issuer consent. Anthropic’s own warning suggests the company sees that blurring as a risk, not a convenience.

In a support notice, Anthropic said any unapproved sale or transfer of its stock would be void and not recognised on the company’s books and records. That is unusually stark language for a market that often sells sophistication as a substitute for clarity.

“Any sale or transfer of Anthropic stock … is void and will not be recognized on our books and records.”

— Anthropic

Issuer consent is not a technical footnote. A transfer the company refuses to record can still circulate as an economic claim between private parties, yet the buyer may have purchased exposure to someone else’s paperwork rather than a clean line on the cap table. That distinction is manageable when volumes are modest and participants know one another. It gets more dangerous when billions of dollars of demand start hunting for inventory.

History offers less comfort than usual. The old private-market bargain asked investors to exchange liquidity for early access and patience. The Anthropic trade is asking buyers to accept illiquidity, limited transparency and transfer uncertainty at the same moment that prices are being pulled higher by public-market style excitement. Momentum can survive that mix for a while. Price discovery rarely does.

Revenue made the scramble rational

Buyers still need a reason to crowd in this hard, and CNBC reported one. Anthropic generated $4.8 billion of revenue in the first quarter and is targeting $10.9 billion in the second quarter, a pace that would put the company into profitability, according to the report. Those are the kind of figures that make secondary buyers treat a private round as a provisional public listing.

Quarterly numbers carry extra force in private markets because there is no steady stream of audited filings to dilute each headline. One reported revenue jump can move expectations for everyone in the chain, from founders and employees to brokers packaging access for late buyers. In public equities, a strong quarter is absorbed into a broader reporting calendar. In private AI, it can reset the tone of the market by itself.

The revenue context also helps explain why the secondary market has grown disorderly. If a private company can show quarterly revenue at that scale before an IPO, investors do not want to wait for a formal roadshow. They want exposure before bankers impose a cleaner allocation process. Scarcity then does the rest. Every hard-to-source share starts to carry two prices: the value of the business itself, and the value of getting there early.

Rivalry sharpens that urgency. Sherwood reported that OpenAI produced $5.7 billion of first-quarter revenue, leaving the two companies close enough for investors to frame the race as a contest over who reaches public markets with the stronger narrative. CNBC’s analysis went further, arguing that getting to market first matters because the first large AI listing could anchor how investors price the next one.

Dan Ives, the Wedbush analyst quoted in CNBC’s market analysis, reduced the stakes to a race for narrative control:

“Getting to public markets first is very important, given this arms race going on.”

— Dan Ives, quoted by CNBC

Viewed through that lens, Anthropic’s secondary frenzy matters beyond one company. The first AI IPO is unlikely to price only one balance sheet. It will create a reference point for every late-stage model developer, cloud partner and venture holder sitting on private paper. Investors know that. Intermediaries know it too. The result is a market that is trying to discover the public price before public markets exist.

What public markets will force into the open

Public listings do not eliminate hype. They do impose discipline that the current secondary market can still evade. A prospectus forces a cleaner view of dilution, governance, transfer restrictions, customer concentration and the sustainability of growth. In Anthropic’s case, it would also force a more standardised conversation about how revenue translates into margins, capital spending needs and competitive durability against OpenAI and other AI groups racing to the same window.

That disclosure gap matters because the present market is being built from fragments: a revenue report here, a transfer warning there, an anecdote about fresh demand somewhere else. Once one of the major AI groups files, investors will be able to compare customer concentration, stock compensation, compute obligations and governance terms on the same page. Until then, private buyers are making pricing calls with fewer anchors than the rhetoric around the sector suggests. That is a thin base for an asset already being marketed as scarce, strategic and almost impossible to source.

Until that happens, buyers in the secondary market are paying for access to a story whose terms can shift underneath them. Fortune’s $1 trillion demand figure explains the attraction. Anthropic’s warning on unauthorized transfers explains the hazard. Put together, they suggest the real tension in private AI finance is no longer whether there is enough capital. There is plenty. The problem is that capital is arriving faster than the market structure needed to absorb it.

Anthropic now has a good problem in one sense and an expensive one in another. Strong revenue growth has made its stock the asset investors most want before an IPO. The scramble around that stock is also showing how quickly private-market conventions break down when buyers treat pre-IPO AI exposure as a category of its own. If Anthropic or OpenAI lists soon, public investors will inherit the valuation debate. For now, private buyers are carrying the plumbing risk.