Nicky Oppenheimer & family

Who Nicky Oppenheimer is

Nicky Oppenheimer is the third and last generation of the family that controlled De Beers, and through it the world diamond trade, for eighty years. He is also the reason this index has to be honest about its own limits: since 2012 his fortune has had almost nothing to do with the Johannesburg Stock Exchange, which makes him the hardest large South African fortune to value from public documents — and the most instructive one to try.

The Bloomberg Billionaires Index put him at US$12.3 billion in 2025, third-richest in Africa. Unlike Johann Rupert, whose wealth can be read off a share register, Oppenheimer's sits behind a private family office. Nobody outside it knows the composition.

Three generations

The story starts with his grandfather. Ernest Oppenheimer founded Anglo American and became the first of the family to chair De Beers, in 1929. His father Harry ran both companies through the middle of the century. Nicky, born in Johannesburg on 8 June 1945, was educated at Ludgrove, then Harrow, then Christ Church, Oxford, where he took an MA in philosophy, politics and economics. He married Orcillia “Strilli” Lasch in 1968; their son Jonathan now runs much of the family's business.

Three generations, one company, and a succession that was never really in doubt. That matters for reading the fortune: it was not assembled by a founder in a single career, and it was never diversified in the way a self-made fortune diversifies. It was concentrated in one asset for the better part of a century.

Forty-four years inside the diamond business

Oppenheimer joined Anglo American in 1968, the year he married. He became a director in 1974 and deputy chairman in 1983. In 1984 he was made deputy chairman of the Central Selling Organisation — the mechanism through which De Beers controlled the supply of rough diamonds to the world market — and in 1985 deputy chairman of De Beers Consolidated Mines and chairman of the Diamond Trading Company.

He chaired the De Beers Group from 1998 to 2012. He resigned from Anglo American in 2001, though he stayed on as a non-executive director until 2011.

Those dates cover the period in which the diamond business changed underneath him. The Central Selling Organisation model — buy up the world's rough production, release it at a controlled rate, hold the price — was an extraordinary piece of market engineering, and it was steadily dismantled by competition authorities, by producers who no longer needed De Beers to reach the market, and by Russian and Canadian supply arriving outside the channel. What Oppenheimer inherited was a monopoly. What he handed over was a company.

What the Central Selling Organisation actually did

It is worth being concrete about the machine he spent his career inside, because it explains both the size of the fortune and why it could not last.

Diamonds are not rare in the way the price implies. What De Beers sold was not scarcity but the management of scarcity. Through the Central Selling Organisation it bought up the great majority of world rough production — its own and other producers' — and released stones to a closed list of buyers at prices and volumes it set. When demand fell, the CSO absorbed the surplus into a stockpile rather than let the price find its level. When a new field opened outside the system, De Beers preferred to buy the output than to compete with it.

That is an expensive thing to run. It requires enormous working capital tied up in unsold inventory, and it only works while almost everyone is inside the tent. Through the 1990s and 2000s they stopped being: Russian production found its own routes, Australian and Canadian mines sold direct, competition regulators in Europe and the United States took an interest, and Botswana — by then the source of much of the best rough — wanted a larger share of the value chain than a supplier's role gave it.

By the time Oppenheimer stepped down, De Beers was a large, well-run diamond miner and marketer competing on its merits. That is a perfectly good business. It is not the same business his grandfather built, and it did not carry the same premium.

4 November 2011: the end of eighty years

On 4 November 2011 Anglo American announced it would buy the family's 40% stake in De Beers. The transaction was worth £3.2 billion (US$5.1 billion) in cash, and it ended the Oppenheimer dynasty's eighty-year ownership of De Beers. Anglo American's holding rose to 85%; the government of Botswana holds the other 15%.

It is worth sitting with what that sale did to the shape of the fortune. Before it, the family's wealth was a stake in an identifiable company with identifiable mines. After it, the wealth was cash — and cash can be put anywhere, in any jurisdiction, in any asset class, with no obligation to tell anyone. A listed stake is a public fact. A bank balance is not.

That single transaction is why the Oppenheimer entry on this index carries the confidence rating it does, and it is not a criticism of the family. It is a straightforward consequence of how they chose to exit.

What the money went into

What is publicly visible is a family office rather than a portfolio. The wealth is managed through E Oppenheimer & Son and, more recently, Oppenheimer Generations, the umbrella under which the family's investment and philanthropic work now sits.

Several specific ventures are matters of public record. Fireblade Aviation operates a private terminal and charter business at OR Tambo International. Tswalu Kalahari is the largest private game reserve in South Africa, in the southern Kalahari, run as a conservation and research operation as much as a lodge. In 2006 the family partnered with De Beers to establish the Diamond Route, linking eight conservation sites across southern Africa.

The pattern across these is recognisable: long-dated, land-heavy, reputational, and mostly private. None of it revalues from a screen price, which is exactly the problem for an index built to do that.

The Brenthurst Foundation

In 2005 Oppenheimer and his son Jonathan established the Brenthurst Foundation, which works on African economic development and policy. He became a Rhodes Trustee in 2015.

Philanthropy of this kind does not show up in a net-worth calculation and should not — but it is part of why the family remains a public presence in South African economic life a decade and a half after leaving the business that made them. They stopped being industrialists and became an institution.

How Rateweb values him, and why the number is soft

This index builds a figure bottom-up: a disclosed shareholding, multiplied by the current price, plus whatever private holdings can be credibly estimated from public reporting. For most of the people we rank, the first half does the heavy lifting.

For Nicky Oppenheimer the first half is close to empty. There is no controlling JSE stake to value. The last verifiable, dated, public number attached to this fortune is the US$5.1 billion the family received in 2011 — and that is now more than a decade of compounding, spending, taxes, currency movement and reinvestment ago. Anyone who tells you precisely what it became is guessing.

So we do what the methodology requires and lower the confidence rather than raise the precision. The figure we carry is an estimate built on the sale proceeds and on credible public reporting of the family's subsequent activity. It is not a computed valuation, and we mark it as a fixed estimate on the index rather than letting it sit next to live-priced entries as though it were the same kind of number.

Bloomberg's US$12.3 billion is a more aggressive figure than ours. We are not claiming they are wrong. We are saying we cannot show our working to that number from public documents, and an index that publishes figures it cannot defend is not worth reading.

What we do not know

Nearly all of it, in honest terms. The composition of the family office is private. Holdings outside South Africa are not disclosed. Trust structures, art, property and offshore investments are invisible to any method we would be willing to publish. We do not know the split between liquid and illiquid assets, and we do not know what has been given away.

What we do know is documented above, dated, and sourced: the shareholding that was sold, the price, the day it was announced, and the businesses the family has publicly built since.

If you can point us at a public disclosure that sharpens any of this, tell us and we will use it.