The Hunt Brothers Cornered Silver and the Exchange Changed the Rules
Two Texas oil heirs accumulated an enormous silver position that drove prices roughly eightfold. The corner ended when the exchange altered the rules underneath them.
What a Corner Requires
Cornering a commodity means acquiring enough of the deliverable supply that anyone holding a short futures position cannot obtain the physical material to deliver. Shorts must then buy back their contracts at whatever price the holder demands.
It requires enormous capital, a commodity where deliverable supply is limited, and the ability to take actual delivery rather than settling in cash. Silver in the late 1970s met all three conditions.
The Position
Nelson Bunker Hunt and William Herbert Hunt, heirs to an oil fortune, began accumulating silver in the 1970s, motivated substantially by concern about inflation eroding paper assets. They bought both physical bullion and futures contracts, and crucially they took delivery rather than rolling positions forward.
Taking delivery removes metal from the deliverable pool permanently. Combined with allied investors, their holdings represented a very large share of privately held silver outside government stockpiles.
Prices rose from roughly six dollars an ounce to approximately fifty by January 1980.
Buying futures moves the price temporarily. Taking delivery removes the metal from the market, which is what turns a large position into a corner.
How It Ended
The exchange responded by changing the rules. Position limits were imposed, and trading was restricted to liquidation only orders, meaning participants could close existing positions but not open new long ones.
That single change removed the mechanism sustaining the price. Without new buyers permitted to enter, demand was capped while the Hunts still needed continuous buying to support the level. Prices fell sharply.
The collapse culminated on a day in March 1980 when the brothers failed to meet a margin call, and the resulting forced liquidation cascaded through the market. Their brokers faced enormous exposure, and a loan arranged by a consortium of banks was required to prevent broader failures.
The Regulatory Question
The rule change remains contested. Defenders argue the exchange acted properly to prevent a manipulated market from causing widespread defaults among clearing members.
Critics note that several exchange board members held short positions and therefore benefited directly from the rule change. That conflict is a genuine problem in self regulating exchanges, where the people writing the rules are also participants.
The Durable Lesson
The transferable principle is that a position large enough to move a market is exposed to a risk that has nothing to do with the market. Rules can change, exchanges can impose limits, and regulators can intervene.
Anyone whose strategy depends on the rules staying constant holds an unhedged position in the rulebook. That applies well beyond commodities, to short squeezes where trading is restricted, to strategies dependent on a specific tax treatment, and to businesses dependent on a regulatory interpretation.
The Bottom Line
The Hunts controlled the silver and did not control the venue. When your position is large enough to threaten the exchange, the exchange becomes a counterparty with the power to rewrite the terms.