Amazon and Google Sit on a $411 Billion Anthropic Stake Before IPO

Amazon and Alphabet hold a combined $411 billion stake in Anthropic if the AI company's IPO prices at $78 per share, the top of its $70 to $78 range, according to a Reuters calculation. Anthropic expects to price the offering on November 18 and begin trading on Nasdaq under the ticker ANT on November 19. The figure measures total stake value at the IPO price, not profit, and neither Amazon nor Alphabet has commented on the windfall.

Both companies reported third-quarter results in late October. Each now faces a valuation event that sits outside its own operations, and each will soon have to account for it in public markets. The numbers involved are large enough to move the sum-of-the-parts case for at least one of them.

How large are the stakes?

At $78 per share, Amazon's Anthropic position is worth $271.8 billion, set against $18.0 billion invested. Alphabet's position is worth $139 billion against $33.3 billion invested, and that invested figure includes roughly $10.0 billion Alphabet is spending in the IPO placement itself.

The gap in relative weight is wider than the gap in absolute dollars. Amazon's stake equals about 9.3% of its market value at Tuesday's close, compared with about 3.9% for Alphabet. Because of that difference, the IPO price changes the sum-of-the-parts case for Amazon far more than for Alphabet, according to the 24/7 Wall St. analysis.

A side-by-side comparison:

• Amazon: $271.8 billion value at $78; $18.0 billion invested; $289 billion value at an estimated $83 share price.
• Alphabet: $139 billion value at $78; $33.3 billion invested; $147 billion value at the same $83 estimate.
• Combined: $411 billion at $78; roughly $436 billion at $83.

Bankers reportedly expect the deal to price above the stated range, toward a $1.5 trillion valuation, which one outside estimate puts at roughly $83 a share. The same math cuts both ways: if the deal prices below the range, or the stock swings after listing, the paper value falls just as easily.

Why does Amazon's stake arrive slowly?

Amazon will hold 1,920,511,218 non-voting Class N shares after the offering, worth about $149.8 billion at $78. Another 1,563,617,444 shares, worth about $122.0 billion, will be issued later. The reason is a contractual restriction: Amazon's notes bar the company from holding more than 12% of Anthropic's capitalization, so much of the position arrives only over time.

Those notes explain why Amazon paid so little for such a large stake. About $6.2 billion in notes were outstanding at September 30, and they convert at fixed prices of roughly $2.09 and $5.05 per share — a fraction of the $70 to $78 IPO range. Alphabet's 2026 agreement carries its own cap, set at 14.99%. The Class N shares held by both companies carry no voting rights, so neither tech giant gains control of Anthropic through the IPO.

Where does the money flow next?

The two investors are also Anthropic's suppliers. Both Amazon and Alphabet fund Anthropic and sell it computing power, which means the same dollars show up twice in their financials: once as balance-sheet exposure to an AI developer, once as cloud revenue from that developer's training and inference workloads.

The third-quarter cloud numbers frame the dependency. AWS revenue rose 39% year over year to $45.98 billion, and Google Cloud revenue rose 103% to $30.71 billion. Part of that growth depends on a single AI customer staying well funded, the analysis notes — an unusual concentration risk for two of the largest infrastructure businesses in the world.

Once Anthropic trades publicly, each company will mark its stake to the market price, and that mark-to-market step could swing reported earnings every quarter, adding a new source of volatility to two stocks that investors already price against AI-cycle expectations.

When can either company sell?

Lock-up provisions keep most of the gains on paper for months. Most existing holders face lock-ups of up to 180 days after the listing. Holders of more than 0.5% of fully diluted shares face extended lock-ups of up to 365 days. Alphabet's placement shares carry no lock-up, but they are restricted securities that can be resold only under a registration statement or an exemption.

The practical effect is that neither company can convert its paper windfall into cash quickly, even as the market value of the stake starts printing in real time from November 19 onward.

What does the IPO mean for investors in each stock?

Amazon offers the more direct Anthropic exposure among large-cap stocks, according to the analysis. Amazon owns the bigger piece at a lower cost basis, and AWS growth has accelerated for a sixth consecutive quarter, with management projecting growth above 40% in both 2027 and 2028.

That exposure carries a price. Amazon trades near 38 times earnings and posted a trailing free cash outflow of $42.4 billion as it builds out AI capacity. The buildout also has physical dependencies — all of that infrastructure has to be powered, cooled, and networked by suppliers, several of which 24/7 Wall St. covered in a separate report.

Alphabet is the cheaper alternative at about 13 times earnings, and its cloud business is growing faster in percentage terms. But Anthropic is too small a share of Alphabet's total value to move the stock much. Alphabet's investment case rests mainly on Search and Gemini, its own AI product line, rather than on its rival-turned-holding.

What happens after November 19?

The immediate question is the pricing print. A price above the range, toward the $1.5 trillion valuation bankers reportedly expect, would lift the combined stake from $411 billion toward roughly $436 billion before a single share trades. A price below the range would compress it just as fast, and post-listing volatility would flow directly into both companies' marked positions once quarterly reporting begins to reflect the ANT ticker.

For Amazon, where the stake equals 9.3% of market value, the stakes are larger. For Alphabet, the IPO is a significant but secondary event inside a portfolio still dominated by Search. For both, November 18 ends a decade in which their Anthropic bets existed only as balance-sheet entries, and starts one in which the market prices those bets daily.