Saudi Arabian oil company Aramco's logo during the CERAWeek energy conference 2026 in Houston, Texas, U.S., March 24, 2026. REUTERS/Danielle Villasana
Saudi Arabian oil company Aramco's logo during the CERAWeek energy conference 2026 in Houston, Texas, U.S., March 24, 2026. REUTERS/Danielle Villasana
Home » News » Business & Economy » Factbox-From Saudi Aramco to Alibaba: World's biggest IPOs
Business & Economy

Factbox-From Saudi Aramco to Alibaba: World's biggest IPOs

June 1 (Reuters) – Anthropic said on Monday it has confidentially filed for a U.S. initial public offering, as the Claude chatbot maker races with arch rival OpenAI to go public in what would be one of the biggest IPOs of all time.

The move comes ahead of SpaceX’s mega IPO, which is set to rewrite the record books as the Elon Musk-led company pursues a $1.75 trillion valuation.

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If SpaceX raises the $75 billion it wants, the IPO would eclipse the world’s largest to date, which was oil major Saudi Aramco’s listing in 2019.

ChatGPT-maker OpenAI is also preparing to confidentially file for a U.S. initial public offering in the coming weeks, Reuters had reported in May, citing a source ​familiar with the matter.

Here is an overview of the biggest IPOs globally, ranked by deal size:

Company Offer date Sector Deal size

Saudi Aramco 12/05/19 Energy $25.6 billion

Alibaba 09/18/14 Technology $21.8 billion

SoftBank Corp 12/10/18 Communication $21.3 billion

Services

NTT Mobile 10/22/98 Communication $18.1 billion

Services

Visa 03/18/08 Financials $17.9 billion

AIA 10/21/10 Financials $17.8 billion

ENEL SpA 11/01/99 Utilities $16.5 billion

Meta 05/17/12 Technology $16 billion

General Motors 11/17/10 Consumer $15.8 billion

Discretionary

ICBC – H 10/20/06 Financials $13.96 billion

Source: Renaissance Capital

(Compiled by Manya Saini and Arasu Kannagi Basil in Bengaluru; Editing by Shinjini Ganguli, Maju Samuel and Sahal Muhammed)

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