Anthropic’s IPO: Three numbers investors should know

Anthropic’s S-1 presents an exceptionally fast-growing AI company whose IPO appeal will depend on sustaining growth, improving margins and earning attractive returns on heavy computing investment.

• Anthropic reported $16.3 billion of revenue for the six months ended June 30, 2026, versus $1.2 billion a year earlier and approximately $4.6 billion for all of 2025.
• Revenue outside the five largest customers rose from about 64% in the first quarter to 79% in the third quarter, while no single customer contributed more than 10% of revenue during the nine months through September 2026.
• Customer concentration remains relevant because Google Cloud and Amazon Web Services accounted for nearly 48% of first-half revenue through their cloud marketplaces, despite operating competing AI businesses.
• Anthropic spent nearly $9 billion on infrastructure and computing capacity in the first half of 2026, compared with $7.3 billion in all of 2025, but reported an 8% operating margin in the second quarter after a $1.7 billion operating loss in the first quarter.
• The company plans to list Class A shares under the symbol ANT, with its seven co-founders retaining 50.1% of voting power through a single Class F share; the offering size and price range remain undecided.

Takeaway: The IPO offers exposure to extraordinary AI growth and a broadening customer base, but investors must assess whether growth continues, margins improve and the company can generate attractive returns despite its dependence on computing capacity and cloud partners.