Futures Contracts Explained

Get the mechanics wrong and you will bleed money in ways that have nothing to do with your market read. Get them right and you have access to one of the most capital-efficient trading instruments in the world.

This article explains exactly how futures work, from the contract itself through to margin, pricing, and why the professionals lean on this market so heavily.

What a Futures Contract Actually Is

A futures contract is a legally binding agreement to buy or sell a specific quantity of an underlying asset at a fixed price on a specific date in the future. In practice: you are agreeing on a price today for a transaction that settles later.

In the equity index world, the most traded contracts are the E-mini S&P 500 (ES), the E-mini Nasdaq-100 (NQ), and their micro equivalents (MES and MNQ). In commodities, you have Crude Oil (CL), Gold (GC), Natural Gas (NG), and a long list of agricultural products. In fixed income, Treasury futures are among the most liquid instruments on earth.

Every futures contract has a set of specifications you need to know before you trade it:

• Contract size: The notional value of one contract. One ES contract controls 50 times the index value. At 5,200 on the S&P 500, that is $260,000 of exposure per contract.
• Tick size and value: The minimum price movement and what it is worth in cash. ES moves in 0.25 increments, and each tick is worth $12.50. NQ ticks are also 0.25 but worth $5.00 per tick because the multiplier is different.
• Expiry date: Most equity index futures expire quarterly in March, June, September, and December. As expiry approaches, volume migrates to the next contract.
• Settlement method: Equity index futures settle in cash. Physical commodity futures like crude oil involve actual delivery unless you close the position before expiry.

How Margin Works in Futures

Margin is where futures differ most sharply from stocks. In equities, margin means borrowing money from your broker. In futures, margin is a performance bond. You are not borrowing anything. You are depositing collateral to guarantee you can honour the contract.

Initial margin is the amount required to open a position. For a single ES contract, this is typically somewhere around $12,000 to $16,000 depending on your broker and current volatility. Given that the contract controls $260,000 of exposure, you are trading with leverage of roughly 16:1 to 20:1. That leverage cuts both ways.

Maintenance margin is the minimum your account must hold while the position is open. If your account falls below this level due to losses, you receive a margin call. This is not a courtesy request. Your broker can close your positions immediately without asking you first.

Futures are marked to market daily. At the end of each trading session, gains are credited to your account and losses are debited. A position held overnight will see your cash balance adjust every single evening based on where the contract settled.

The practical implication: futures losses are real and immediate. You cannot wait for a stock to recover over three months if margin is being drained daily. Sizing for futures needs to account for the daily mark-to-market reality, not just where you expect price to go eventually.

Contango, Backwardation, and Why Futures Prices Differ from Spot

If you look at the crude oil futures curve when supply is plentiful, you will typically see contracts further out in time priced higher than the nearest contract. This is called contango. If you look at the same curve during a supply squeeze, the nearest contract trades at a premium to later ones. That is backwardation.

For equity index futures, the fair value relationship to spot is driven by a different formula. The futures price reflects the current spot index level adjusted for the cost of carry — essentially the risk-free interest rate over the period — minus any dividends expected before expiry.

When futures are trading above fair value, they are said to be at a premium. Below fair value, at a discount. Significant deviations from fair value are quickly arbitraged away by institutional desks, which is why you rarely see the ES trade wildly out of line with the S&P 500 cash index for any meaningful length of time.

Understanding basis — the difference between spot and futures — helps you interpret what the institutional order flow is doing. When futures lead spot aggressively to the upside in the pre-market, that tells you something about where conviction is sitting before the cash market opens. It is not noise.

Hedging Versus Speculation

The futures market exists primarily because of hedgers. A pension fund holding $500 million in US equities can sell ES futures to reduce its exposure without liquidating holdings and triggering a tax event. An oil producer can lock in a sale price for next quarter's production right now, removing revenue uncertainty.

These participants are not trying to profit from price movement. They are trying to remove price risk from their business. And they are the reason the futures market has the liquidity it does.

Speculators — which includes most retail traders — sit on the other side. You are providing liquidity to hedgers and trying to profit from price movement in the process. There is nothing wrong with this. Without speculators, hedgers would have nobody to trade with.

Practical Examples: ES, NQ, GC, CL

Take the E-mini S&P 500 (ES). You have a view that the market will rally from a key support zone. You buy one contract at 5,200. Each point of movement is worth $50. The index rallies 20 points to 5,220. Your profit is $1,000 on a $14,000 margin deposit — roughly 7% on the capital deployed in what might be a single session's move.

Now consider Gold (GC). One contract is 100 troy ounces. Gold at $2,300 per ounce means one contract controls $230,000 of gold. A $10 per ounce move equals $1,000 profit or loss per contract.

Crude Oil (CL) is one of the most volatile contracts available. One contract is 1,000 barrels. A $1 per barrel move equals $1,000 profit or loss. On a day when oil moves $3, that is $3,000 per contract. CL also has genuine delivery obligations if you hold through expiry — retail traders without storage facilities need to be diligent about rolling or closing positions well before the first notice day.

The micro contracts — MES, MNQ, MGC — are a tenth of the standard contract size. For traders building skills or testing strategies with smaller risk, they offer full market access without full contract exposure.

Rolling Contracts: Managing Expiry

Because futures contracts expire, you need to understand what rolling means in practice. As a contract approaches its expiry date, liquidity migrates from the front-month contract to the next quarterly contract. If you want to maintain exposure beyond expiry, you need to close your current contract and re-open in the next one.

Most professional traders in equity index futures roll approximately one to two weeks before expiry, when the new contract has typically absorbed the majority of open interest. You can track this by watching which contract has the higher volume. When the next quarterly contract starts trading more volume than the front month, that is your cue to roll.

The price difference between the front month and the next contract at the time of rolling is called the roll cost or roll yield. In equity index futures, this difference is typically small and predictable. In commodity futures, particularly those in steep contango, the roll cost can be a significant drag on performance over time.

Risk Management: Sizing for the Real Numbers

The combination of high notional value and leverage means that position sizing in futures requires a different level of precision than in other instruments. A single ES contract moving 20 points in the wrong direction is a $1,000 loss. A 50-point move against you is $2,500. On a $30,000 account, that is a meaningful percentage of capital from a single contract position on a bad day.

The professional approach starts with defining the maximum acceptable loss per trade in dollar terms, then working backward to the number of contracts that produces that risk given the expected stop distance.

If you are willing to risk $500 on a trade and your stop is 10 points away on ES (each point worth $50), then a single contract risks exactly $500. That is your trade. The mistake most new futures traders make is sizing by number of contracts first and thinking about the dollar risk second.

Why Serious Traders Use Futures

The answer is not leverage, though leverage is part of it. The answer is efficiency. Futures give you:

• Capital efficiency: Control meaningful notional exposure with a fraction of the capital that would be required to hold the underlying directly.
• Liquidity: The ES and NQ markets are among the most liquid instruments on earth. Tight spreads, deep books, minimal slippage on reasonable size.
• Extended hours: Futures trade almost 24 hours a day, five days a week. You can react to overnight news, economic releases, and global market moves without waiting for the US cash open.
• Short selling without restrictions: Selling a futures contract short has none of the complications of borrowing stock. You simply sell.
• Transparency: Exchange-traded futures are centrally cleared and fully transparent. No dealing desk interventions, no requotes, no off-market settlement.

Against these advantages, the risks are real: leverage amplifies losses as effectively as gains, daily mark-to-market means losses are immediate and can trigger margin calls, and the contract mechanics require more active management than simply buying and holding shares. None of these are reasons to avoid futures. They are reasons to understand them before you trade them.