How is COMEX zinc inventory measured?

COMEX zinc inventory is measured in metric tons. Stocks are divided into warranted (registered) and non-warranted (eligible) categories at approved delivery points.

What is zinc used for?

Zinc is primarily used for galvanizing steel to prevent corrosion, accounting for about 50% of demand. Other uses include zinc alloys (die casting), brass production, batteries, and chemical compounds. It is the fourth most consumed metal globally after iron, aluminum, and copper.

How does COMEX zinc compare to LME zinc?

The LME is the dominant exchange for zinc futures globally, with warehouses worldwide. COMEX zinc futures provide a North American pricing benchmark. Monitoring both exchanges gives a complete picture of global zinc supply.

Why does zinc inventory matter?

Zinc inventory is an indicator of industrial activity, particularly in construction and infrastructure. Low inventory levels can signal strong demand from galvanizing and manufacturing sectors, while rising stocks may indicate slowing economic activity.

What is zinc galvanizing?

Galvanizing is the process of coating steel with zinc to prevent corrosion. It accounts for about 60% of global zinc consumption. Zinc reacts with the atmosphere to form a protective barrier on steel surfaces, extending the lifespan of structures, vehicles, and infrastructure by decades.

COMEX Zinc Inventory

Physical zinc stocks at COMEX-approved delivery points

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What Is COMEX Zinc Inventory?

COMEX zinc inventory represents the total physical zinc stored at CME Group-approved delivery points. Zinc is measured in metric tons and categorized as warranted (available for delivery against futures contracts) and non-warranted (meets quality standards but not registered for delivery). These stocks provide transparency into North American zinc supply.

Why Zinc Inventory Matters

Zinc is essential for protecting steel infrastructure through galvanizing, making it a bellwether for construction and industrial activity. Global zinc mine production is around 13 million metric tons annually, with demand closely tracking economic cycles. Inventory drawdowns often correlate with periods of infrastructure investment and economic growth.

COMEX Zinc Futures Contract Specifications

COMEX zinc futures contracts are traded on the CME Group's electronic platform with delivery at approved US warehouses. Deliverable zinc must meet a minimum purity of 99.995% (Special High Grade) and conform to standard slab specifications. Contract sizes and delivery months follow CME Group standards for base metals.

The LME is the dominant global exchange for zinc futures, but COMEX zinc contracts provide a North American pricing benchmark. The spread between COMEX and LME zinc prices reflects regional premiums, transportation costs, and localized supply-demand conditions. Traders and industrial consumers use COMEX zinc futures to hedge North American zinc exposure.

Global Zinc Market: Galvanizing and Construction

Approximately 60% of global zinc consumption is used for galvanizing steel, a process that applies a protective zinc coating to prevent corrosion. Galvanized steel is ubiquitous in construction, infrastructure, automotive body panels, and electrical transmission towers. This makes zinc demand a strong proxy for construction and infrastructure spending globally.

China is the world's largest zinc consumer, driven by its massive steel production industry. Chinese steel output accounts for over half of global production, and the majority of that steel is galvanized. As a result, Chinese construction activity, infrastructure investment, and steel production data are key indicators for global zinc demand and inventory trends.

Beyond galvanizing, zinc is used in die-casting alloys (automotive parts, hardware), brass production (plumbing, electrical connectors), and zinc oxide (rubber, chemicals, pharmaceuticals). These secondary applications provide a diversified demand base but remain smaller than the dominant galvanizing sector.

Data Sources & Methodology

COMEX zinc inventory data is sourced from the CME Group's daily warehouse stock reports. These reports are published each business day after market close and provide a breakdown of warranted and non-warranted zinc stocks at each approved delivery point.

MetalCharts processes this data daily to calculate net changes, track historical inventory trends, and present warehouse stock movements in an accessible chart format. Our historical data enables users to identify correlations between zinc inventory levels, construction activity indicators, and zinc price movements over time.

Frequently Asked Questions

How is COMEX zinc inventory measured?: COMEX zinc inventory is measured in metric tons. Stocks are divided into warranted (registered) and non-warranted (eligible) categories at approved delivery points.
What is zinc used for?: Zinc is primarily used for galvanizing steel to prevent corrosion, accounting for about 50% of demand. Other uses include zinc alloys (die casting), brass production, batteries, and chemical compounds. It is the fourth most consumed metal globally after iron, aluminum, and copper.
How does COMEX zinc compare to LME zinc?: The LME is the dominant exchange for zinc futures globally, with warehouses worldwide. COMEX zinc futures provide a North American pricing benchmark. Monitoring both exchanges gives a complete picture of global zinc supply.
Why does zinc inventory matter?: Zinc inventory is an indicator of industrial activity, particularly in construction and infrastructure. Low inventory levels can signal strong demand from galvanizing and manufacturing sectors, while rising stocks may indicate slowing economic activity.
What is zinc galvanizing?: Galvanizing is the process of coating steel with zinc to prevent corrosion. It accounts for about 60% of global zinc consumption. Zinc reacts with the atmosphere to form a protective barrier on steel surfaces, extending the lifespan of structures, vehicles, and infrastructure by decades.