Anthropic IPO: How the SpaceX Playbook Could Shape a Blockbuster Market Debut?

When Anthropic begins trading after its expected IPO next week, the early price may depend less on who wants the shares and more on who has to buy them. Investors are studying SpaceX’s June listing for clues, because it changed how giant companies debut on the stock market.

Anthropic’s IPO at a Glance

Anthropic plans to raise up to $64.4 billion by selling 825 million shares priced between $70 and $78 each. At the top of that range, the company would be valued at up to $1.4 trillion. Its shares are expected to trade under the ticker ANT on Nasdaq.

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Only about 6% of Anthropic’s outstanding shares are being offered at the IPO. A small public float matters because limited supply, combined with heavy demand, can push prices up quickly.

How SpaceX Rewrote the Listing Rulebook?

SpaceX’s debut in June changed how mega-listings work. In the past, major index providers usually waited weeks or months before adding a new company to their benchmarks. This time, providers such as Nasdaq changed their inclusion rules, so a large pool of passive money had to buy SpaceX shares within the first 15 days of trading.

Anthropic is expected to follow the same path. It will be added to at least six major indexes within 5 to 15 days of listing, including FTSE’s USA index, the S&P Total Market Index and the Nasdaq 100. Carsten Hesse of Berenberg called Anthropic a “mirror image” of the SpaceX IPO, with the same index-related drivers in the first 15 days.

Key Numbers Compared

Detail	SpaceX (June)	Anthropic (Expected)
Offering size	$75 billion	Up to $64.4 billion
Valuation	Nearly $1.75 trillion	Up to $1.4 trillion
Share price	$135 IPO price	$70 to $78 range
Retail allocation	About one-fifth	About one-fifth
Index inclusion	Within 15 days	Within 5 to 15 days

Passive Money and Retail Investors Take Center Stage

Analysts at the London-based firm Intropic estimate that index-tracking funds will account for about 28% of the shares on offer, or roughly $19 billion. Index-rebalancing funds and hedge funds are expected to buy early to position themselves for that demand.

Retail investors are also a big part of the picture. SpaceX set aside a fifth of its offering for them, more than double the usual share, and Anthropic is doing the same. For SpaceX, index funds and retail investors took nearly half of the shares sold, which created upward momentum.

What SpaceX’s First Weeks Reveal?

SpaceX’s early trading offers a possible template:

By the third day, shares were up 50% from the $150 opening price.
The stock stayed well above its $135 IPO price for the first 15 days.
Shares then drifted lower as investors prepared for lock-up expirations, when employees and early backers can sell.

SK Hynix, which listed on Nasdaq in July, also jumped on day three. Analysts link this to the start of stock-option trading, when speculators in those derivatives hedge by buying the underlying shares. Anthropic is expected to see similar early buying. As Hesse put it, investors do not wait until index inclusion actually happens, but buy early.

Where Anthropic Could Differ?

Anthropic’s path may not be identical. The company will let employees who own roughly 15% of its equity sell some shares on the first day, which adds supply that SpaceX’s early trading did not have in the same way.

Anthropic is also raising $26 billion through a separate private sale to cornerstone investors, including Google, Nvidia and AMD. Those shares do not carry a lock-up.

A Windfall for Index Arbitrage Funds

The new rules have created large opportunities for funds that trade around index changes. Brian Hartigan of Invesco called it an evolution of the market, driven by giant companies that built massive private stakes before going public. Celia Fseil of Candriam noted that with such large issues, the risk of overcrowding is smaller. Bill Park of Altisma Capital Management said that for index-rebalancing specialists, such events are “probably the events of a lifetime”.

One report said two teams at Millennium Management made $3.7 billion trading index changes in June, though the firm did not confirm it.

What to Watch Next?

Three things will matter most: how strongly index and retail demand shows up in the first days, whether employee selling on day one offsets it, and how the stock behaves around options trading and index inclusion dates. If SpaceX is the guide, early momentum could be strong, but lock-up expirations remain a later test.

Disclaimer: For informational purposes only. This article does not constitute investment advice. Make financial decisions based on your own research.

SpaceX IPO

Anthropic IPO

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How much is Anthropic aiming to raise in its IPO?

Up to $64.4 billion, by selling 825 million shares priced between $70 and $78 each, at a valuation of up to $1.4 trillion.

Why is the SpaceX IPO being compared to Anthropic’s?

Index providers changed their rules so passive funds must buy mega-IPO shares within days. Anthropic is expected to be added to at least six major indexes within 5 to 15 days.

How much passive demand is expected?

Intropic estimates about 28% of the shares offered, or roughly $19 billion.

How did SpaceX shares perform after listing?

They were up 50% from the opening price by day three and stayed above the $135 IPO price for 15 days before drifting lower.

Who is investing in Anthropic’s private sale?

Cornerstone investors including Google, Nvidia and AMD are part of a separate $26 billion private sale, with no lock-up on those shares.