IPO Desk
Anthropic, Pbc
Confidential S-1 announced Jun 1, 2026 · terms not yet public
Filing announced
Jun 1, 2026
Terms
Not public until the S-1 flip
Calendar data: Finnhub, refreshed nightly. Verify terms against the prospectus on SEC EDGAR — the prospectus is the primary source.
What the pattern engine reads today: nothing — by design.
Contra runs 372 falsifiable patterns against filings, insider activity, and market structure. A company with a confidential draft S-1 has nothing on the public record yet — there is no pattern surface at all. Each stage below adds something readable. That is the difference between a date you can verify and a story you can’t.
When it becomes readable
Confidential S-1 announced
The company says it submitted a draft registration statement to the SEC. Terms, size, and financials stay private — a confidential filing puts nothing on the public record except the announcement itself.
Prospectus becomes public
The S-1 appears on EDGAR at least 15 days before the roadshow begins. First look at real financials, risk factors, float, and lockup terms — the first falsifiable material.
Pricing and first trade
Price and share count are set at the end of the roadshow; trading starts the next day. Timing depends on market conditions and the company's choice.
What usually happens — the base rates
First-day pops are the norm, not a signal
The average US IPO has closed its first day about 18% above the offer price across 1980–2023 (Ritter, University of Florida IPO statistics). The pop reflects deliberate underpricing and attention — it says nothing new about the business.
Attention buying costs retail money
Individual investors are net buyers of attention-grabbing stocks — names in the news, with extreme volume or extreme one-day returns — and that buying pattern predicts underperformance (Barber & Odean, 'All That Glitters', 2008). IPOs are the single most attention-concentrated event in markets.
The class lags for years
IPOs as a group have underperformed size-matched peers over the three years after listing (Ritter 1991, confirmed in updated samples through 2023). The lag concentrates in smaller and unprofitable issuers — the kind retail buys most eagerly.
Lockup expiry is a supply event with a date
When the (typically 180-day) lockup ends, insiders can sell for the first time. Expiry weeks have historically run ~1.5% below market with a permanent ~40% volume increase (Field & Hanka 2001). It is on the calendar from day one.
The first analyst wave is mechanical
Underwriters' analysts must wait 10 calendar days before publishing (FINRA Rule 2241). Coverage then arrives in a cluster and skews positive (Bradley, Jordan & Ritter 2003) — initiation-day enthusiasm is a schedule, not a discovery.
Historical base rates from published academic research, cited inline. Education, not investment advice.
See what the engine reads — and when it stays silent.
Contra scans falsifiable patterns across 800+ tickers daily and says “no view” when there is nothing to read — which is the honest answer on most IPO day-ones.