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

NTT

01/06/2026 18:07

Changes dateline, updates with Anthropic

    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 2223.SE 
12/05/19
Energy
$25.6 billion
Alibaba 9988.HK 
09/18/14
Technology
$21.8 billion
SoftBank Corp 9984.T 
12/10/18
Communication Services
$21.3 billion
NTT Mobile 9432.T
10/22/98
Communication Services
$18.1 billion
Visa V.N 
03/18/08
Financials
$17.9 billion
AIA 1299.HK 
10/21/10
Financials
$17.8 billion
ENEL SpA ENEI.MI 
11/01/99
Utilities
$16.5 billion
Meta META.O 
05/17/12
Technology
$16 billion
General Motors    GM.N 
11/17/10
Consumer Discretionary
$15.8 billion
ICBC - H 1398.HK
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)
 ((Manya.Saini@thomsonreuters.com; X: manya__saini;))