However, the biggest influence on its early share price could come from investment funds tracking major stock market indexes. Investors are already studying Elon Musk’s SpaceX listing for clues about Anthropic’s potential market performance.
SpaceX changed the traditional IPO playbook when it entered the stock market in June. Major index providers adjusted their inclusion rules, creating an enormous pool of passive investment demand.
Now, Anthropic could experience a similar trading pattern as several major indexes prepare to include its shares. This could create significant buying pressure during the first 15 days of trading.
Anthropic IPO Could Attract Billions Through Index Fund Buying
Anthropic plans to offer 825 million shares at an estimated price of $70 to $78 each. The proposed offering could raise up to $64.4 billion and value the artificial intelligence company at approximately $1.4 trillion.
Unlike traditional IPO arrangements, Anthropic expects several major indexes to include its shares shortly after listing.
These indexes include the FTSE USA index, S&P Total Market Index and Nasdaq 100. At least six major benchmarks could add Anthropic within five to 15 days of its market debut.
Previously, major index providers generally waited weeks or months before including newly listed companies. However, recent changes have accelerated this process for exceptionally large IPOs.
Carsten Hesse, London-based head of index events at Berenberg, highlighted the similarities between the two listings.
“Anthropic is a mirror image of the SpaceX IPO. In that regard, it has the same index-related drivers over the first 15 days of trading,” he said.
Index-rebalancing analytics firm Intropic estimates that passive investment demand could account for approximately 28% of Anthropic’s offered shares.
That represents roughly $19 billion in potential purchases from index-tracking funds. Meanwhile, hedge funds and other investors may buy shares early to position themselves ahead of expected index demand.
Why SpaceX’s IPO Could Provide a Blueprint for Anthropic
SpaceX’s June listing demonstrated how index inclusion can influence trading activity immediately after an IPO.
The company raised $75 billion through its offering, reaching a valuation of nearly $1.75 trillion. It also reserved approximately one-fifth of its shares for retail investors.
That allocation exceeded the standard proportion offered to individual investors in traditional listings.
Anthropic is following a similar approach by making a substantial allocation available to retail investors.
During SpaceX’s debut, index funds and individual investors purchased nearly half the shares offered. Other institutional investors also positioned themselves ahead of expected index-related buying.
Consequently, demand concentrated on a relatively small portion of the company’s total outstanding shares.
Anthropic faces a similar situation, with only around 6% of its outstanding shares expected to enter the public market through its IPO.
This limited supply could intensify competition among investors seeking exposure to the company. Furthermore, anticipated purchases from index-tracking funds could add pressure during the initial trading period.
Anthropic Shares Could See Early Buying Pressure
Investors may not wait until major indexes officially include Anthropic before purchasing its shares.
Hedge funds and index-arbitrage investors often position themselves ahead of anticipated changes. They aim to purchase shares before passive funds begin their scheduled buying.
Hesse explained that investors had already adopted this strategy during SpaceX’s listing.
“You don’t wait till day 5, day 10, day 15, when you see the implementation of the index upgrades or inclusions,” he said. “As we’ve seen with SpaceX, people are buying early.”
Another factor could influence Anthropic’s early trading performance: derivatives activity.
SpaceX and South Korean semiconductor company SK Hynix experienced substantial share price increases on their third trading days. Both companies saw increased activity when stock-option trading began.
Speculators purchasing derivatives also bought underlying shares to hedge their positions.
Analysts expect Anthropic could experience similar buying activity during its opening days. However, the extent of that demand will depend on actual trading conditions.
SpaceX Shares Jumped 50% After Its Market Debut
SpaceX provided a striking example of how concentrated demand can influence a major IPO.
By its third trading day, SpaceX shares had climbed approximately 50% from their opening-day debut price of $150. The stock also remained comfortably above its $135 IPO sale price throughout the first 15 days.
However, the shares subsequently began losing momentum as investors anticipated upcoming lock-up expirations.
These restrictions determine when employees and other early investors can sell shares following an IPO. Their expiration can increase the available supply and create additional selling pressure.
Ruben Pathmanathan, an equity analyst at Intropic, explained why SpaceX could provide a useful comparison.
“What makes SpaceX a potential blueprint is how several market forces came together around the listing: index inclusion, passive demand and a tightly held float.
Together, they shaped how the shares were priced and how they traded in the early days,“ he said.
Nevertheless, Anthropic’s situation includes some important differences.
Employee Share Sales and Private Investment Could Change Anthropic’s IPO
Anthropic is allowing employees who own approximately 15% of its equity to sell some shares on the first trading day.
This arrangement could introduce additional shares into the market earlier than investors experienced during comparable listings.
The company is also raising another $26 billion through a separate private sale involving major cornerstone investors.
These investors include Alphabet’s Google, Nvidia and Advanced Micro Devices (AMD). Unlike certain IPO allocations, these privately sold shares do not carry lock-up restrictions.
Therefore, Anthropic’s early trading could follow a different pattern from SpaceX, despite their similarities in index-related demand.
The combination of employee share sales, private investment and institutional buying could influence the balance between available supply and investor demand.
New Index Rules Create Major Opportunities for Investment Funds
The changing approach to index inclusion has created significant opportunities for funds specialising in index-rebalancing trades.
Traditionally, these strategies faced limitations because IPO offerings were relatively small. Too many investors attempting to anticipate passive fund purchases could create overcrowded trades.
However, enormous listings such as SpaceX and Anthropic offer a different environment. Their larger share offerings can accommodate substantial institutional demand.
Brian Hartigan, global head of ETFs and index investments at Invesco, described the development as a major market shift.
“It’s a bit of an evolution of the market,” he said, referring to unusually large IPOs involving companies with substantial private ownership.
Celia Fseil, head of equity market neutral strategy at Candriam, also highlighted the opportunities for investors.
“This is the type of opportunity that the arbitrage community likes because the risk of overcrowding is more limited,” she said.
The potential profits from these trades have already attracted attention across the investment industry.
Two index-trading teams at Millennium Management reportedly generated $3.7 billion in June, according to Bloomberg. However, Millennium declined to confirm the reported figure.
Bill Park, CIO of Connecticut-based Altisma Capital Management, described the scale of these opportunities.
“If you’re in index rebalancing, these are probably the events of a lifetime,” he said.
Will Anthropic Repeat SpaceX’s IPO Success?
Anthropic’s upcoming listing could become another major test for the changing dynamics of the IPO market. Its enormous valuation, limited public share supply and anticipated index inclusion create several important trading factors.
However, its employee share sales and additional private investment distinguish it from SpaceX. These differences could influence how much buying pressure develops during the first few weeks.
For investors, the central question is how institutional demand will interact with the available supply of shares. SpaceX has already demonstrated the potential impact of these market forces.
Now, Anthropic’s debut could reveal whether the same strategy can shape another historic technology IPO.
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