Four large private financings landed inside a week, mostly at valuations that step up sharply from prior marks.
Positron AI announced an $875 million Series C at a $5 billion valuation, disclosed through the company's own release on . The round places it among the larger AI infrastructure financings of the current cycle.
It did not land alone. Inside the same week, Harvey raised $550 million at a $15.5 billion valuation in legal AI, Mach Industries raised a $600 million Series C extension at $3.7 billion, and Clay raised $115 million at $7.1 billion. Add The Boring Company's $3 billion at $23 billion, covered separately in this batch, and that is roughly $5.1 billion of announced late-stage private capital across five companies in a handful of days.
The divergence worth noticing
These rounds cleared, mostly at step-ups, during a week in which the public AI complex was selling off hard. Monday saw a semiconductor ETF fall nearly 5% and individual equipment and photonics names fall 7% to 12% on commentary about slowing the pace of frontier AI development.
Private late-stage marks do not reprice on the same clock as public comparables. They reset when a round prices, which happens once every 18 to 24 months per company, rather than continuously. A public selloff that runs for a week has no mechanical path into a private mark that was set in a negotiation three months earlier.
That lag is not a flaw in the market, but it is the precondition for the markdown exits now visible at the other end of the cycle. When a private mark stops tracking what a public or strategic buyer will pay, the gap does not close gradually. It closes all at once at exit, which is what a 92% discount on a $600 million ARR software business looks like when it finally happens.
The test
Whether the next tranche of these rounds still clears at step-ups after Wednesday's Fed decision. A higher policy rate raises the discount rate applied to long-dated growth, and late-stage private AI is about as long-dated as growth gets. If the pricing holds, the current wave of sovereign and strategic capital is genuinely insensitive to the rate path. If it does not, the marks set this week will be the high-water line for this cycle.