×

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

By Thomson Reuters Jun 1, 2026 | 12:11 PM

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.

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)