Contango

A contango — a market structure where future commodity prices are higher than spot prices — is the normal state for most commodities and reflects the cost of storage and financing. Investors holding commodity futures contracts through expiration face “roll yield” risk: they must sell expiring contracts at lower prices and buy deferred contracts at higher prices, locking in storage costs as losses. This roll yield drag is why commodity indices and funds often underperform spot prices.

The normal market structure

Contango is the typical state for most commodities. In a contango market, the futures price for delivery in 3 months is higher than the futures price for delivery in 1 month, which is higher than the current spot price.

This price structure makes economic sense: holding physical inventory is expensive (storage, insurance, financing). A trader willing to store commodity for 3 months should be compensated for this cost. The difference between the 3-month futures price and the spot price reflects the cost of storage plus an economic return for taking on inventory risk.

Storage costs and financing

The primary driver of contango is the cost of holding inventory:

• Storage: Warehouses, tanks, silos cost money to lease or maintain.
• Insurance: Inventory must be insured against loss or damage.
• Financing: Money borrowed to purchase inventory carries interest cost.
• Handling and deterioration: Some commodities (food, biofuels) degrade over time; losses must be factored into carry costs.

For a commodity with $100 spot price and 6% annual storage/financing cost, the 6-month futures should trade near $103. The $3 premium covers the cost of holding inventory for 6 months.

Convenience yield

The inverse force is “convenience yield” — the benefit of holding physical commodity instead of a futures contract. A refinery storing crude oil has the ability to process it immediately if prices spike; a futures holder cannot.

A business that needs a commodity (refinery, power plant, food processor) might pay a premium for immediate availability (convenience). This convenience yield acts to reduce the contango spread; it is the benefit of holding inventory versus holding a futures contract.

Roll yield drag for commodity investors

Commodity indices and commodity funds hold futures contracts, which expire. To maintain exposure, they must “roll” — sell the expiring contract and buy a deferred contract.

In a contango market, the roll is a losing operation. Suppose:

• A commodity index holds the 1-month contract at $100.
• The 1-year contract is trading at $110 (in contango).
• The index sells the expiring 1-month contract at $100 and buys the 1-year contract at $110.
• Net result: locked in a $10 loss ($10 per 100 units, or 10%).

This is the “roll yield” drag — the negative return from rolling in contango. If the commodity spot price stays flat, the index drops 10% purely from rolling costs.

Over a year, rolling every month in a steep contango can result in 5–15% annual performance drag, even if the commodity spot price does not move.

Example: Crude oil and natural gas

Crude oil typically trades in a mild contango, with storage costs less than 1% per month. Holding a crude futures contract through expiration costs roughly 0.5–1% per month.

Natural gas often exhibits steeper contango due to the high cost of storing natural gas (requires specialized facilities, liquefaction, or underground caverns). Storage costs can reach 2–3% per month, creating steep contango and severe roll yield drag.

An investor holding natural gas futures through expiration in a steep contango market might experience 20–30% annual roll yield drag.

Super-contango

Occasionally, markets develop extreme contango, called “super-contango”. This occurs when physical supply is perceived as scarce and future supply is expected to be abundant.

In super-contango, spot prices are extremely low (due to oversupply) and deferred prices are much higher (due to expected supply tightness). The calendar spread (difference between near and far contracts) widens dramatically.

Super-contango creates arbitrage opportunities: traders can buy spot commodity cheaply, store it, and sell it forward at a price that covers costs and provides profit.

Contango vs. backwardation

Backwardation is the opposite market structure: spot prices are higher than future prices. This occurs when commodity is perceived as scarce and immediate supply is valued highly.

In backwardation, rolling is profitable: you sell the expiring contract at a high price and buy the deferred contract at a lower price, locking in a gain.

Markets flip between contango and backwardation based on supply-demand fundamentals and expectations.

Implications for commodity investing

The contango/backwardation structure explains why passive commodity index returns often lag spot price returns. An index investing in commodity futures in a contango market experiences negative roll yield drag.

This drag is particularly severe for:

• Natural gas: Steep contango, high storage costs.
• Soft commodities: Variable, but often in contango due to seasonal storage.
• Long-duration storage: The longer the roll period, the more contango accumulates.

By contrast, gold and silver often exhibit mild contango (storage is cheap), so roll yield drag is limited.

Trading strategies

Traders exploit contango/backwardation via several strategies:

• Calendar spreads: Selling near contracts and buying far contracts to capture contango.
• Cash-and-carry: Buying spot, storing, and selling forward when contango covers costs.
• Reverse cash-and-carry: Selling spot, buying forward in steep backwardation.

These strategies require operational capability (storage access, financing) and are primarily the domain of professional traders and commodity firms.

See also