London Gold Spot vs Futures: How the Two Markets Connect

The London Bullion Market Association (LBMA) operates the global over-the-counter gold spot market. COMEX in New York runs the dominant gold futures market. The two markets together form the global price discovery mechanism for gold, linked through arbitrage and the Exchange for Physical (EFP) mechanism. Understanding how the two markets connect, and when they dislocate, is essential for any serious gold trader. This guide explains the relationship.

The two markets

LBMA spot gold

• Quoted in: USD per troy ounce.
• Primary participants: Bullion banks, central banks, mining companies, refiners, jewelers, investment funds.
• Settlement: T+2 in allocated or unallocated form.
• Benchmarks: LBMA Gold Price AM (10:30 AM London) and PM (3:00 PM London), twice-daily auctions setting reference prices used worldwide.
• Allocated vs unallocated: Allocated gold is specific bars assigned to the buyer. Unallocated is a claim on bullion held by a bullion bank, efficient for trading but carries counterparty risk.

COMEX gold futures (GC)

• Quoted in: USD per troy ounce.
• Contract size: 100 oz per contract.
• Settlement: Physical delivery to COMEX-approved warehouses.
• Trading hours: Nearly 24 hours (CME Globex).
• Primary participants: Speculators, hedgers, commercial users, asset managers.

The price relationship

In normal conditions, COMEX futures price slightly above LBMA spot, reflecting:

• Cost of carry, financing cost of holding gold from spot to futures delivery.
• Storage cost, small but non-zero.
• Convenience yield, typically slightly negative for gold (longs accept some carry cost).

The basis (futures - spot) typically runs $5-15/oz for the front-month future during normal conditions. The relationship is enforced by arbitrageurs who buy spot and sell futures (or vice versa) when the basis dislocates.

Exchange for Physical (EFP)

The EFP mechanism is how spot and futures markets actually link. An EFP is a privately-negotiated transaction where a trader exchanges a futures position for an equivalent physical position (or vice versa).

Worked example

A bullion bank wants to convert a long futures position into physical gold. The bank arranges an EFP with a counterparty:

1. Bank closes long futures position at the EFP-agreed price.
2. Bank receives physical gold at an equivalent value (LBMA price plus or minus the EFP differential).

The EFP differential reflects current basis dynamics, what the market is pricing for the exchange between paper futures and physical gold.

EFP transactions report to CME but execute as bilateral negotiations. Daily EFP volume can be substantial, sometimes exceeding regular CME futures trading volume.

Basis dynamics

The futures-spot basis varies based on:

1. Funding cost (interest rates)

Higher USD interest rates make holding spot gold (which pays no yield) more expensive. The futures basis widens to compensate.

2. Physical demand

Strong physical demand for delivery (jewelry season, central bank purchases) tightens spot relative to futures. Basis compresses.

3. Speculative futures positioning

Heavy speculative long futures positions can push futures higher than physical fundamentals justify. Basis widens; arbitrageurs sell futures and buy physical.

4. Stress events

In stress regimes (covid March 2020, banking crises), EFP differentials can widen dramatically as logistics and counterparty concerns disrupt normal arbitrage.

5. Carry costs

Storage and insurance costs are typically minor for gold (high value-to-volume ratio) but contribute to the basis.

The 2020 EFP dislocation

In March 2020, EFP differentials widened to over $100/oz at peak, far above normal $5-15 ranges. The dislocation reflected:

• Disruption to international gold logistics (flight cancellations, refining shutdowns).
• Counterparty concerns affecting spot trading.
• Heavy speculative futures positioning.
• Specific operational issues at LBMA Good Delivery refiners.

The dislocation persisted for weeks before normalizing. Traders running spot-futures arbitrage strategies experienced unusual PnL patterns.

How traders use the spot-futures relationship

1. Cash-and-carry arbitrage

Buy LBMA spot (allocated gold), sell equivalent COMEX futures. Capture the basis as the future converges to spot at expiry. Capital-intensive (full physical purchase) but well-defined trade.

2. Reverse cash-and-carry

When basis is unusually wide (futures expensive vs spot), sell COMEX futures, take delivery of physical at expiry. Less common operationally but possible.

3. EFP-driven trading

Bullion banks and physical desks use EFPs constantly to balance their physical inventory and futures positions. The market for EFPs is institutional but the published differentials inform broader market analysis.

4. Calendar spread vs basis

A widening basis (futures higher) often corresponds to a steeper futures curve (contango). Traders can express basis views through calendar spreads on futures, capturing the same underlying dynamics with less operational complexity than physical-futures arbitrage.

Settlement and delivery considerations

LBMA spot settlement

T+2 standard. Settlement happens through LBMA-approved bullion banks acting as transfer agents. Allocated gold transfers between specific accounts; unallocated transfers are book entries.

COMEX futures settlement at expiry

COMEX gold futures (GC) are physically settled. At first notice day, longs can be assigned delivery; shorts must deliver. Most speculators close positions before first notice day to avoid delivery operations.

For traders intending to take delivery, the COMEX warehouse system holds approved bars (100 oz or 1 kg) at designated locations. Delivery involves coordination with custody and shipping providers.

Cross-market arbitrage triggers

Specific events can produce arbitrage opportunities:

1. Specific physical demand spikes

Sudden central bank purchase announcements, India wedding season demand surges, or other physical demand catalysts can move spot more than futures, creating arbitrage.

2. Speculative futures positioning extremes

Very heavy speculative long futures positions (Commitment of Traders data) can push futures premium above sustainable levels.

3. Currency moves

Sudden USD moves affect spot and futures slightly differently due to settlement conventions. Brief arbitrage windows can open and close quickly.

4. Operational disruptions

Logistics issues affecting one market more than the other (covid-era examples) can sustain dislocations longer than normal arbitrage timing.

Cost considerations

Physical-spot trading

• LBMA bid-ask spread (typically tight).
• Storage and insurance for allocated gold.
• Dealer markup for unallocated transactions.
• T+2 settlement timing.

Futures trading

• CME exchange fees.
• Broker commission.
• Basis convergence cost over the holding period.

EFP transactions

• Negotiated bilateral pricing.
• Some operational complexity.

Practical implications for retail traders

For retail traders not running physical-futures arbitrage:

• Use COMEX futures (GC, MGC) for paper-gold exposure with deep liquidity.
• Use spot-tracking ETFs (GLD, IAU, SGOL, PHAU) for ETF wrapper around physical-backed exposure.
• Use coin or bar purchases for true physical holding.

The spot-futures relationship matters mainly for understanding why prices behave as they do, not as a direct trading opportunity for retail.

Why basis matters even for retail traders

• Curve interpretation, futures curve shape reflects basis dynamics with similar interpretations as commodities curves elsewhere.
• ETF tracking, physical-backed gold ETFs (GLD) track spot; futures-backed gold ETFs (USO-equivalent for gold) face roll cost in contango.
• Macro signal reading, basis dislocations can signal stress in physical markets.

Related reading

• Gold COMEX futures (GC and MGC), parent overview.
• Gold-silver ratio trading, relative-value gold trading.
• Commodity Derivatives pillar, the full landscape.