Forbes magazine in their July 18, 1994, pages 152-219, and July 15, 1996, pages 142-243 issues listed an index of the Billionaires around the world.
These articles implied that they are all-inclusive lists. However, it becomes clear that they are not complete lists when they excludes such prominent wealthy persons such as:
Her Royal Majesty Beatrix - Queen of the Netherlands (known as the wealthiest woman in the world)
Her Royal Majesty Margrethe II - Queen of Denmark
Her Royal Majesty Sofia - Queen of Spain
Sir Muda Hassanal Bolkiah Muizzadin
Waddaulah - The Sultan of Brunei, Darussalam
King Fahd - Monarch of Saudi Arabia
Emir Shaikh Jabir al-Ahmad al-Jabir as-Sabah - King of Kuwait
Sultan Qabus bin Said - King of Oman
Emir & Prime Minister Khalifah ibn Hamadath-Thani - King of Qatar
President Zaid ibn Sultan an-Nahayan - Ruler
of the United Arab Emirates
Haydar Abu Bakr-al Attas - Prime Minister of
Yemen
Amir isa bin Sulman al-Khalifa - King of Bahrain
The House of Rothschild,
The Wallenberg interests,
The Warburg interests,
The Schiff interests, or many others.
The ultra-rich are very likely members of the Inner Circle of the Elite and do not want their massive wealth to be known by the public, therefore, they are not likely to be listed by Forbes magazine or any other news media.
I am not the first, nor the last, to say that the "rich are getting richer", and the "middle-class and the poor are getting poorer" . However, I now have the absolute proof of this statement. The following chart very clearly proves that this well-known statement is indeed true.