Key Highlights

● Amazon fell 1.63% to $266.46 while chip stocks rallied.

● Anthropic's IPO filing details how AWS convertible notes become Class N shares.

● Total Anthropic holdings could be worth about $142 billion at the IPO midpoint.

● AWS Revenue grew 39% to $46.0 billion, its fastest pace in nearly five years.

What made Amazon (NASDAQ:AMZN) one of the most actively traded U.S. stocks on a day when the Nasdaq rallied? The shares moved against the market. They slipped while chipmakers surged, and investors worked through a new Anthropic filing that spells out how Amazon's large Investment in the AI company will turn into stock. Amazon fell 1.63% to $266.46 during the session, on 10.32 million shares. That ranked it eleventh among U.S. stocks by dollar volume.

The Anthropic filing and a split market

Amazon's decline followed Anthropic's amended IPO filing. The filing describes how convertible notes held by Amazon Web Services will convert into Anthropic Class N shares when the IPO closes. Up to 276,827,518 shares could go to AWS, subject to an ownership cap. At the $74 midpoint of Anthropic's price range, those shares would be worth about $20.5 billion. Class N shares carry economic rights but no general voting power.

The filing also shows how big Amazon's total exposure has become. A reading of the filing puts Amazon's total holding at about 1.92 billion Class N shares. That would be worth roughly $142 billion at the midpoint, or about 4.8% of Amazon's market value. Anthropic's post-IPO share price will become a visible swing Factor in Amazon's non-operating income. That cuts both ways: it can boost reported profit when the stock rises and hurt it when the stock falls. Anthropic is set to price on Nov. 18 and begin trading on Nasdaq under the ticker "ANT" on Nov. 19.

The rest of the market looked very different. CoreWeave's strong quarter set off a rally in chip and AI hardware stocks. The Philadelphia Semiconductor index jumped 5.66%, while Amazon and Microsoft (NASDAQ:MSFT) were among the megacaps that fell. The split suggests investors were favoring the suppliers of AI hardware over the cloud giants paying for it. Beyond the filing, there was no single Amazon-specific negative, so the move is best read as a mix of stake-related repositioning and a rotation within tech.

What Amazon does

Amazon runs the world's largest online store and a fast-growing Advertising business. Its most profitable unit by far is Amazon Web Services, the biggest Cloud Computing provider. AWS rents computing power, storage and AI services to businesses, and it designs its own AI chips, called Trainium. Anthropic runs workloads on Trainium, which ties the startup's growth to Amazon's custom-chip economics. Anthropic also spreads its computing work across Google, Nvidia (NASDAQ:NVDA) and Advanced Micro Devices (NASDAQ:AMD) hardware.

Results: record margins, heavy spending

Amazon's third-quarter report, released Oct. 29, showed strong cloud growth paired with enormous investment. Net sales rose 12% to $201.9 billion. AWS revenue grew 39% to $46.0 billion, its fastest growth in nearly five years, and reached an annualized run rate of $184 billion. AWS Operating Income was $17.8 billion. Total operating income jumped to $28.1 billion from $17.4 billion, and the operating Margin of 13.9% was Amazon's highest ever.

Net income was $20.7 billion, or $1.89 per share, down slightly from $1.95 a year earlier. Amazon said the decline mainly reflected $9.5 billion of pre-tax gains on its Anthropic investments in the year-ago quarter. EPS came in below the roughly $1.97 analysts expected.

Spending was the issue that worried investors. Trailing 12-month free Cash Flow was an outflow of $42.4 billion, driven by a $94.8 billion rise in property and equipment purchases, which Amazon attributed mainly to AI investment. The company still expects about $220 billion of cash Capital spending in 2026. Amazon plans to spend "meaningfully more" in 2027 and the shares fell more than 7% after hours on the report.

For the fourth quarter, Amazon guided to net sales of $240 billion to $247 billion, up 12% to 16%, and operating income of $28.5 billion to $33.5 billion. CEO Andy Jassy said AWS can grow by more than 40% in both 2027 and 2028. He added: "There has never been a trillion dollar revenue business, and we may have two of them in the next 5-10 years." The AWS contracted Backlog stands at $578 billion, more than double a year earlier.

Valuation versus peers

Amazon looks reasonably priced against its megacap peers. Amazon trades at about 21.5 times trailing earnings. That compares with about 27.1 for Microsoft, 21.6 for Meta Platforms (NASDAQ:META) and 15.2 for Alphabet (NASDAQ:GOOGL)'s Class A shares. One third-party valuation model puts Fair Value at about $259 and rates the stock fairly valued. That is not a consensus target.

Bull and bear cases

The bull case rests on AWS. Growth is speeding up, the backlog has more than doubled, and management is targeting 40%-plus growth for two more years. Record operating margins show the retail Business is also earning more. The Anthropic stake adds another source of value that could be worth well over $100 billion at the IPO midpoint, based on a reading of the filing.

The bear case rests on cash. Free cash flow has swung deeply negative, and capital spending is set to climb again in 2027. If AI Demand cools, Amazon could be left with expensive capacity it cannot fill. The Anthropic holding also brings volatility: once the shares trade, swings in Anthropic's price will flow into Amazon's reported profit. Higher interest rates raise the bar for long-dated investments, and futures markets are pricing in a December Fed rate hike.

Anthropic's Pricing Date and Beyond

The near-term catalyst is Anthropic's IPO, with pricing set for Nov. 18 and trading expected Nov. 19. The deal will put a public Market Value on Amazon's stake for the first time. After that, the holiday shopping season and the fourth-quarter report will show whether Amazon hits its operating income guidance and how much more capital spending it commits to for 2027. Investors will also watch AWS growth, Trainium adoption and any update to the $578 billion backlog. Wednesday's dip suggests the market is still weighing Amazon's AI spending against the cloud growth that spending is meant to produce.