COMEX vs LBMA: How the Two Biggest Gold Markets Actually Settle

Gold trades around the clock, but two markets dominate price formation. The COMEX in New York operates on a futures-driven model with daily mark-to-market and physical delivery against specific contract months. The LBMA in London operates on an OTC bilateral model with allocated and unallocated settlement. The differences are not academic.

COMEX: futures-led, US-based

COMEX is the world's largest gold futures exchange. The benchmark contract is for 100 troy ounces of 995 fine gold, deliverable as Good Delivery bars or kilobars in a CME-approved vault. Daily volume regularly exceeds 200,000 contracts, equivalent to 20 million ounces. Most contracts close before delivery, but the delivery mechanism is real and growing in importance.

• 100-oz contract size, deliverable bars and kilobars
• Approved vaults: JPMorgan, HSBC, Brinks, Loomis, Manfra Tordella & Brookes
• Daily mark-to-market with margin calls
• Delivery month: typically 5-15% of open interest takes physical
• Volume concentrated in front-month and quarterly contracts

LBMA: OTC and physical-first

The London Bullion Market Association does not run an exchange. It runs a standards body and a delivery framework. Trading happens bilaterally between member banks. The settlement standard is a 400-oz Good Delivery bar moved between unallocated accounts at clearing members. London clears more than 20 million ounces per day, dwarfing COMEX in physical terms.

"COMEX prices gold. LBMA delivers gold. The two systems coexist because they do different jobs." — bullion banker, speaking at LBMA conference 2024

The 2020 dislocation

In March 2020, COVID lockdowns disrupted air freight between Switzerland and New York. COMEX faced a delivery squeeze because Good Delivery bars in London (400-oz) had to be re-cast to COMEX-eligible kilobars (32.15-oz) at Swiss refineries — a route that suddenly closed. The basis between COMEX and LBMA blew out to over $50, exposing the structural difference between the two markets.

What it means for traders

COMEX prices respond faster to macro signals — Fed announcements, dollar moves, equity volatility. LBMA prices respond to physical flow, central bank settlements and large institutional rebalancing. Watching the basis between the two markets is one of the cleanest signals of physical stress available to retail traders.

Convergence over time

The two systems are converging operationally. COMEX has expanded its vault network and added kilobar delivery options. The LBMA has improved transparency on positioning and storage. The gap remains, but both regulators are pushing for tighter integration.

Takeaway: COMEX is leverage and price discovery. LBMA is metal. Knowing which one is moving on a given day is half of understanding gold market structure.