“Stock futures are lower,” says the breakfast headline. The US stock market's regular session has not opened, yet there is already a falling price on your screen.
Suppose a December Micro E-mini S&P 500 futures contract settled at 5,000 yesterday and is quoted at 4,940 this morning. That is a fall of 60 index points. For someone holding one contract, it is a $300 move.
The headline describes a contract trading now. How does that quote turn into dollars, and when does someone have to pay?
A contract trading before the shares
A futures contract is an exchange-traded agreement that commits both sides to settle a trade at a future date. The exchange sets its size, expiration and settlement rules; traders agree on the price. The contract month and year identify which expiration you hold.
Index futures tie that agreement to a stock index, such as the S&P 500. Buying to open a long position means you gain when the futures price rises. Selling to open a short position means you gain when it falls. An option buyer pays for a choice; a futures trader takes on an obligation.
These contracts trade overnight while the underlying stocks' regular session is closed. The cash index, calculated from the stocks themselves, still reflects earlier prices. Futures traders can respond to fresh news before the stock market's opening bell.
Interest rates, expected dividends and time to expiration also affect the gap between futures and the cash index. A discount to the cash index alone does not mean traders expect stocks to fall.
Multiply the quote into dollars
CME's Micro E-mini specifications give this contract a $5 multiplier: each index point is worth $5. Our prices and account requirements are made up; all gains and losses exclude costs and taxes.
Notional exposure is the dollar amount represented by the contract.
At 5,000, one contract represents 5,000 × $5 × 1 = $25,000. “Micro” means smaller than the E-mini version. It still puts thousands of dollars in play.
Say you bought one contract at 5,000. Its profit or loss (P/L) is the point change from entry to exit or settlement, multiplied by $5. A fall to 4,940 gives (4,940 − 5,000) × $5 = −$300. The short side gains $300 from the same move.
Every row starts from that 5,000 entry:
| Quote | Point change | Long P/L |
|---|---|---|
| 4,940 | −60 | −$300 |
| 5,000 | 0 | $0 |
| 5,060 | +60 | +$300 |
Neither side has bought or borrowed a basket of shares. The $25,000 measures exposure. The deposit required and the amount you could lose are separate questions.
Margin is collateral, not a stock loan
With stock margin, you borrow money to buy shares. Futures margin is a performance bond: collateral backing your obligations. It is money set aside to support the trade, not borrowed purchase money or an option premium.
In our example, initial margin is $2,000 to open the position. Maintenance margin is $1,800 to keep it open. You deposit exactly $2,000, and this broker requires a top-up to the initial amount if your balance falls below maintenance.
Marking to market values your position at the exchange's daily settlement price. Daily variation settlement then adds the gain to your cash balance or deducts the loss. You pay the loss while the position is still open.
If the day's settlement price is also 4,940, the $300 loss leaves $1,700 in the account, below maintenance:
Adding $100 would reach maintenance; this broker requires $300 to restore the full $2,000. You have now put in $2,300 to have $2,000 left. Replenishing collateral does not erase a loss.
The next daily settlement starts from 4,940. If it is 4,960, you receive 20 × $5 = $100. Across both days, you have paid $300 and received $100: a $200 net loss. The first day's loss is not charged again.
A small move, a large cash hit
The first day's 60-point fall is 60 ÷ 5,000 = 1.2% of the starting quote. Yet it takes $300 ÷ $2,000 = 15% of your original cash. You started with $25,000 of exposure backed by $2,000.
If you save $200 a month, the $300 top-up exceeds a whole month's contribution. Next month's savings cannot pay a demand that arrives first.
Cash settlement and the headline
This US equity-index contract uses cash settlement at expiration: a final cash adjustment ends the obligation. No basket of shares arrives. Other futures can require physical delivery.
Before expiration, selling one contract with the same specifications and expiration closes one long contract. This is called offsetting. Replacing it with a later expiration opens a new position with its own price and terms.
Institutions use index futures to hedge or adjust market exposure; speculators accept price risk for possible profit. The same contract can reduce one portfolio's risk and add risk to another.
At breakfast, the December quote of 4,940 is 60 points below its previous settlement of 5,000. One long Micro contract is down $300. Settling there triggers the separate $300 top-up in our account. The headline reports a price move; the account terms determine the cash demand.
The timestamp and comparison price belong with the quote. Lower at breakfast does not promise a lower opening or closing price, or decide what to do with your stock order. You can understand the headline without ever trading futures. The track's final funding check applies the cash question to a stock loan.
In short
- Index futures carry obligations for both sides, even when the stock market's regular session is closed.
- Quote × multiplier × contract count gives notional exposure, not the cash deposit.
- Daily settlement pays gains and collects losses while a position stays open.
- Futures margin is collateral, not a loan or a loss limit.
- An overnight futures quote describes trading at that moment, not a promised stock-market result.