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Shanghai vs COMEX

The Shanghai Gold Exchange (SGE) is a physical spot market; COMEX is the world’s largest precious-metals futures venue. The spread between them — SGE benchmark vs COMEX nearest futures, both in USD — is one of the most-watched indicators of physical-vs-paper market positioning. This page explains how the spread is structured, what moves it, and how to read it for directional clues about Chinese physical demand.

Published

Spot vs futures, physical vs paper

SGE and COMEX serve different participants. Most SGE volume is physical: refiners pulling kilos for jewelry, banks hedging physical inventory, industrial buyers covering forward consumption. The price formed on SGE reflects what someone is actually paying to take physical delivery in China.

COMEX is dominated by speculation, hedging, and ETF arbitrage. Open interest is many times the deliverable supply, and most contracts close out before notice day. The price formed on COMEX reflects derivatives-market positioning more than physical scarcity.

When SGE trades at a premium to COMEX in USD, it means physical buyers are paying up over what the futures market is implying. That spread is the most direct public signal of physical tightness vs paper-market positioning.

What moves the spread

Chinese physical demand cycles. Jewelry buying around Lunar New Year, solar panel manufacturing ramps, and refining campaigns all drive episodic SGE-side demand that widens the spread.

SGE inventory levels. Falling SGE warrant stocks combined with steady demand pushes the premium up; inventory restocking via permitted import routes pulls it back.

USD/CNY shifts. SGE prices in CNY converted to USD will move with the exchange rate even when underlying physical flows are stable. We use spot USD/CNY (not the offshore CNH or PBOC fix) for our conversions to minimize this distortion.

COMEX positioning. Large speculative positioning on COMEX (long or short) can drive the futures price away from the underlying physical level, widening or compressing the spread without any change in physical supply.

How institutional arbitrage works

Direct SGE/COMEX arbitrage is restricted to participants with SGE membership and physical import licensing. The mechanics: when SGE trades at a sustained premium, an authorized importer sources physical silver from a Western refiner (LBMA Good Delivery bars re-melted to SGE-spec 99.99% bars), pays the 13% silver VAT, and sells into the SGE market. The arbitrageur captures the spread minus VAT minus logistics.

The arbitrage is not free money. It requires significant working capital, multiple licenses, time-of-flight risk, and the willingness to absorb the spread compression that the arbitrage itself creates. In practice, only large bullion banks and a handful of specialized refiners do meaningful volume.

How to read the spread for directional signals

Single-day spread spikes are usually noise — either USD/CNY gapping, a one-off SGE liquidity event, or a COMEX-specific positioning unwind. The signal is in trends.

A spread that has been widening for 3+ weeks alongside falling SGE inventory is the cleanest physical-tightness signal. Historically this combination has preceded sustained Western price strength.

A compressed spread (under $0.30/oz for silver, under $5/oz for gold) sustained for weeks usually means physical supply has caught up with Chinese demand — not necessarily bearish, but the physical-tightness signal is muted.

Frequently asked questions

What's the main difference between SGE and COMEX?
The Shanghai Gold Exchange (SGE) is a physical spot market — its primary contracts (Au99.99, Ag(T+D)) are designed for actual delivery to refiners, jewelers, banks, and industrial buyers. COMEX, by contrast, is a futures-based market — most contract volume is closed out before delivery, with physical settlement representing only a few percent of trading. The two venues serve fundamentally different participants and have different price-formation dynamics as a result.
Why does the Shanghai-COMEX spread exist?
Three structural reasons: (1) Chinese physical demand is concentrated in jewelry, refining, and electronics; COMEX is more financialized; (2) Chinese capital controls limit the speed at which gold and silver flow between the two markets; (3) China's import duties (especially the 13% silver VAT) and licensing requirements add friction to direct arbitrage. The spread expands when Chinese demand outpaces what permitted import routes can supply, and contracts when those routes catch up.
Can traders arbitrage the SGE/COMEX spread directly?
Only with the right institutional access. Direct arbitrage requires SGE membership (or a relationship with a member), permission to import physical metal into China, and willingness to absorb the 13% silver VAT and gold withdrawal fees. Most participants are large refiners and bullion banks. Retail and most hedge fund investors trade the spread synthetically via paper exposure to both markets.
What does a widening Shanghai-COMEX spread signal?
Most often, it signals tight Chinese physical supply relative to demand. When Chinese refiners and jewelers need silver and SGE inventory is low, SGE prices rise above what COMEX is doing on a USD basis. Sustained spread expansion (especially combined with falling SGE inventory) has historically preceded broad-market silver strength.
How often is the spread updated?
Hourly during overlapping SGE / COMEX trading hours. Outside SGE hours, the SGE leg is held at its most recent close while the COMEX leg keeps moving — the displayed spread can drift accordingly. Use overlapping-hour data points for the cleanest read.
Are SGE silver and COMEX silver the same product?
Different specifications but largely interchangeable for most purposes. SGE Ag(T+D) is 99.99% pure silver in 1kg bars; COMEX silver futures are 5,000-ounce contracts deliverable in 1,000-oz Comex Good Delivery bars (99.9% minimum). Both are the global benchmark for their respective regions and are correlated >95% over multi-year windows.