Will Anthropic's IPO follow SpaceX's decline? A testable aftermarket forecast

SpaceX opened trading on June 12 at $150 a share, the largest IPO on record, and closed back below that price a month later. Anthropic is set up to be the sequel: it filed a confidential S-1 in June, and by early September it was expected to start marketing an IPO in mid-October at a reported $2 trillion target, roughly double the $965 billion value its last private round set four months earlier. Here is the call I am willing to put on paper. Anthropic's stock will close at or below its first-day opening trade at some point within 60 calendar days of listing, and the proxy vehicles that are currently charging retail a premium for pre-IPO access — LAZR, DXYZ, and VCX — will converge toward their underlying net asset values inside that same window. The question your email asks, whether the divergence holds or breaks, is not a mood question. It is a measurement with a deadline.

The market is already showing its hand

Before the first share trades, three public wrappers tell you what the crowd believes Anthropic is worth and how confident that crowd is that the aftermarket will hold the value up.

• LAZR, the tiny Tema Photonics & Optical ETF, bought Anthropic through an SPV in July and gave retail a way to own it at a $1.39 trillion implied valuation as of September 1. No management, performance, or redemption fee on that sleeve — the point is pure access.
• DXYZ (Destiny Tech100) carries about an 18% Anthropic weight and now trades near its roughly $36–40 estimated NAV, after a brutal de-rating this summer. At its June low it was down sharply from its highs.
• VCX, the closed-end fund that came out of Fundrise, is the furthest out on the emotion curve: it traded as high as roughly $315 against a net asset value near $19 — a premium north of 1,500% — while its management fee climbed to 2.5%. It now trades around $33 with a 120-day loss near 56%, but still at a premium to its holdings.

A premium to NAV on a wrapper is a price tag for "access." Every dollar of that premium is the market saying the underlying shares are going to stay worth something after the direct market opens — otherwise why pay the wrapper a fee to own what you could soon buy plain. Read across the three vehicles, that is a consensus that Anthropic's post-listing slide is a small-probability event. The market's wrapper pricing implies maybe a one-in-five chance of a real decline.

SpaceX is the counter-example the crowd keeps trying to forget. It opened at $150, dropped 23% from its post-IPO peak within a fortnight, fell 16% in a single session, and by mid-July had closed below the $150 opening price. The exact same wrapper dynamic played out: when SpaceX listed, DXYZ's single biggest holding became directly purchasable, and the fund's raison d'être vanished, so its premium drained and the shares de-rated hard. Anthropic is the largest remaining private position in those same wrappers. The setup is not merely similar. For DXYZ it is the same fund running the same play on the same second asset.

The falsifiability contract

Lock the call before events move, so nobody gets to quietly redefine it later.

• Subject: Anthropic PBC common stock, and the six-week window that starts on its first day of public trading (expected after a mid-October marketing start).
• Direction and threshold: Anthropic closes at or below its first-day opening trade price at least once within 60 calendar days of its first day of trading.
• Proxy leg: in the same 60-day window, the premium-to-NAV that VCX and LAZR's Anthropic exposure carry compresses by at least half; DXYZ, already near its NAV, moves further below it rather than back to a premium.
• Measurement: official daily closing prices; for the funds, each vehicle's disclosed NAV estimate.
• Kill condition: if Anthropic's stock trades for the full 60 days without ever printing a closing price at or below its day-one open, I am wrong, flatly, no scorekeeping about "early" or "directionally."

My side of the bet is that the decline happens. The evidence puts the probability closer to two-in-three; the wrappers are pricing it at one-in-five or lower. That gap is the entire article.

The clock is already ticking — three signals, in order

You do not have to wait for the aftermarket to know which way this goes. Three earlier disclosures will tell you, and one arrives before the first trade is even possible.

1. The S-1 price range and the secondary. The first observable signal is the offer range itself. A range set near $2 trillion, a two-fold step above the $965 billion private mark, means the offer has already consumed most of the upside that pre-IPO buyers were promised at $965 billion to $1.4 trillion — so the reward left for the aftermarket is mostly a first-day pop to be sold into. Watch for the mix of new shares and shares sold by existing holders. A heavy secondary from early investors is the most reliable tell that the people who got in cheap are using the IPO as their exit, which is precisely the inventory that cracks the float.

2. The final valuation range relative to the private mark. The wider the priced step above the private round, the more the first-day action becomes a hunt for someone to sell the pop to. A conservative range that underwrites near or below where the SPVs marked Anthropic would slow the clock and refute the worst of the decline risk.

3. Early trading volume and price behavior. SpaceX's signature was not just the pop — the biggest IPO ever saw enormous early volume and then the same heavy volume grinding the price down as the people who held through the hype took profits. Week-one is your tell: if Anthropic pops on day one and then rolls over on sustained declining price and still-heavy volume, that is the SpaceX path confirming. If it opens tight to the range, prints thin volume, and quietly holds, that refutes it.

Name the forced seller

If the SpaceX path repeats, the forced seller is the retail incumbent — the person who bought LAZR, DXYZ, or VCX specifically for pre-IPO access. That trade has a built-in expiry date: the moment Anthropic shares are directly purchasable, the reason to own a wrapper that charges a premium, or a 2.5% fee, or an SPV discount evaporates. The marginal buyer who kept VCX at triple-digit premiums and bid DXYZ up to a premium is the same marginal buyer who rotates into the direct stock the day it lists, and when access demand dies the premium is gone. That is not a prediction of panic; it is the structural removal of the bid that produces the premium. It is the exact motion that emptied DXYZ when SpaceX listed in June.

Why it could hold — and the line that ends the debate

The honest countercase deserves its air. Anthropic is not SpaceX top-to-bottom: its revenue has roughly quintupled in under six months, and the September pricing and product moves — a 75% cut in cache-read pricing to drive agentic volume, gated government-grade capabilities, and enterprise data-sovereignty controls — are explicitly engineered to justify the valuation step. In a market still feeding on AI growth, a $2 trillion first-market listing can stay sticky simply because no one with a winner wants to sell. That is why my conviction is two-in-three, not nine-in-ten.

The decision rule is the same either way: if the S-1 price range lands materially below the private mark's implication, or if week-one volume is thin and the stock holds the range without rolling, the decline case is dead, and holding the wrappers through the direct listing costs you only the fee. But if the range prices the pop up near $2 trillion with a heavy secondary, and the first days roll on real volume, the divergence does not hold — it breaks the way it broke for DXYZ at the SpaceX listing.

The tripwire to watch first

You do not need to sit through the first trade to place a disciplined position on this. The single date-stamped event that decides most of it comes before the bell: the price range in Anthropic's public S-1. If it prints near $2 trillion, the setup for a SpaceX-style rollover is loaded, and the wrappers' premiums are your reward for carrying risk they have stopped pricing. Watch the S-1 range. It is the first observable answer to whether the market learned the SpaceX lesson or is paying tuition for it a second time.