How the London PM Fix Actually Sets the World's Gold Price

If you have ever traded a gold contract, paid a refining fee, or read a central-bank reserve report, the price you used almost certainly traces back to a 60-second auction that takes place every weekday afternoon in London. The mechanics are surprisingly modern, and surprisingly opaque to outsiders.

From the Rothschild parlour to electronic auction

The original "fix" began in 1919 when five bullion houses met daily at N M Rothschild's offices to balance buy and sell orders. The structure survived almost a century before the 2014 reform replaced telephone calls with an ICE Benchmark Administration auction, partly in response to manipulation lawsuits. The mechanics are now electronic but the participant list is still small.

• 13 direct participants including JPMorgan, HSBC, UBS, Goldman Sachs and ICBC Standard
• Two daily auctions: 10:30am and 3:00pm London time
• Each round lasts up to 30 seconds with imbalance tolerances
• Reference price for over 90% of OTC gold contracts
• Administered by ICE under FCA-regulated benchmark rules

How a single round works

The auction opens with an indicative price. Participants enter buy and sell volumes. If the imbalance is within the tolerance (currently 10,000 ounces), the auction ends and that price becomes the benchmark. If not, the chair adjusts the price and a new round begins. Most days settle in two to four rounds.

"The fix is not a price discovery mechanism so much as a daily clearing house. It is where the world's bullion books get marked." — former LBMA chairman, speaking at a 2023 industry conference

Why the PM fix matters more than the AM

The 3pm fix overlaps with active US trading hours and is the price most central banks, refiners and ETF custodians use to mark portfolios. Quarterly reserve revaluations, mining royalty payments and a large share of derivative settlements reference the PM fix specifically.

What can go wrong

The 2014 settlement with Barclays for fix manipulation cost £26 million. Since then surveillance has tightened, but the fundamental tension remains: the participants in the auction are also major dealers in the underlying market. Reform proposals to widen participation surface every few years and rarely advance.

Takeaway: The PM fix is not the most actively traded gold price, but it is the most economically important. Every refining contract, ETF NAV and central bank balance sheet depends on it.