United States
Hong KongDealing in futures contracts: margin, mark-to-market and closing out
A futures contract binds both parties to a standardised transaction at a future date. Both post initial margin, positions are marked to market daily, and variation margin settles the day's gains and losses in cash. A shortfall triggers a margin call, and failure to meet it allows close-out. HKCC clears.
Margin is the concept candidates most reliably misunderstand, and the misunderstanding is specific. They treat it as a deposit toward the purchase price. It is not. It is a performance bond, and the difference decides several questions on every paper.
- Market
- Hong Kong Futures Exchange (HKFE), part of the HKEX group
- Clearing house
- HKCC - HKFE Clearing Corporation
- Obligation
- Both parties are bound; there is no premium and no walk-away right
- Margin
- Initial margin at inception, variation margin daily
- Exit route
- Close out by taking the offsetting position, or run to settlement
What makes a futures contract different from a forward?
Standardisation and a clearing house. A forward is a private bargain: the parties agree quantity, quality, date and price between themselves, and each carries the other's credit risk for the life of the deal. A futures contract has terms fixed by the exchange, trades on a public market, and is cleared centrally.
That last feature is what makes futures liquid. Because HKCC becomes the counterparty to both sides, you can close a position by trading with anyone rather than by finding the original counterparty and negotiating a release.
How does margin actually work?
| Term | What it is | When it moves |
|---|---|---|
| Initial margin | The good-faith deposit required to open a position | At inception, and if the exchange raises requirements |
| Variation margin | Cash settling the day's mark-to-market gain or loss | Every trading day |
| Maintenance margin | The floor below which the account balance may not fall | Monitored continuously |
| Margin call | A demand to restore the account to the required level | When equity falls below maintenance margin |
| Close-out | Liquidation of the position by the broker | When a margin call is not met in time |
Mark-to-market is the engine. At the end of each trading day, open positions are revalued at the settlement price, and the resulting profit or loss is settled in cash between the parties through the clearing house. Nothing accumulates unrealised for months. Yesterday's loss is paid today.
This is why margin is not a part-payment. The money is there to cover the daily flows and the risk of an overnight gap, and it can be exhausted quickly by a position far larger than the deposit that supports it.
A modest initial margin can control a much larger notional exposure. That is the attraction of futures and the reason a small adverse move can wipe out an account. Any answer option suggesting a futures buyer's loss is limited to the initial margin is wrong.
What happens if a margin call is not met?
The broker may close the position out. That is not a courtesy issue, it is a risk control, and it can happen quickly in a fast market. The client remains liable for any shortfall after the close-out, because the obligation was never capped by the amount deposited.
Client agreements for futures dealing spell this out, and the risk disclosure statements provided at account opening say it in plain language. Providing those disclosures in a language the client understands is part of the client agreement requirements, and it connects Topic 7 back to Topic 5.
How is a position closed?
Two ways. Take the offsetting position in the same contract, which extinguishes the exposure through the clearing house. Or hold to expiry and settle, either by physical delivery where the contract provides for it or, more commonly in Hong Kong's index products, by cash settlement against a final settlement price.
Most positions never reach delivery. Traders close out, which is why open interest falls as expiry approaches.
Futures against options, restated
- Both parties bound in futures. Only the writer is bound in an option.
- No premium in futures. The option buyer pays one.
- Both post margin in futures. Only the option writer posts margin.
- Daily cash settlement through variation margin in futures. Option premium is paid once, at the start.
- HKCC clears HKFE futures. SEOCH clears SEHK stock options.
The options guide works the same comparison from the other direction, and reading both is worth more than reading either twice.
A worked question
A client holds a long futures position. The market falls and the account equity drops below the maintenance margin level. The client does not respond to the margin call. What is the position?
- The loss is capped at the initial margin already deposited
- The broker may close out the position, and the client remains liable for any shortfall
- The clearing house assumes the client's loss because it is the central counterparty
- The position is automatically rolled to the next contract month
What to take into the exam
Three sentences. Both sides are bound. Both post margin, and it is a bond rather than a payment. Positions are revalued daily and the difference is settled in cash. Everything else in this heading follows from those, including why the loss is not capped and why a margin call arrives when it does.
I will concede that the syllabus asks for less here than the material deserves. Futures mechanics are genuinely interesting and a proper treatment would run to a book. Paper 1 wants the structure only, so learn the structure, run some practice questions, and save the depth for the papers that need it.
Common questions
What is the difference between initial margin and variation margin?
Initial margin is the deposit required to open a futures position. Variation margin is the daily cash settlement of the mark-to-market gain or loss on that position. Initial margin secures the position; variation margin pays out the day's move.
Is futures margin a down payment on the contract?
No. It is a performance bond securing the parties' obligations, not a part-payment of the purchase price. That is why losses are not capped at the amount deposited and why the client remains liable for any shortfall after a close-out.
What happens if a client fails to meet a margin call?
The broker may close out the position to limit further exposure, and can do so quickly in a fast market. The client stays liable for any shortfall remaining after the close-out, because the obligation was never limited to the margin deposited.
Which clearing house clears HKFE futures?
HKCC, the HKFE Clearing Corporation. It becomes the counterparty to both sides of every trade, which removes bilateral credit risk and allows a position to be closed by trading with any other market participant.
How is a futures position closed out?
Either by taking the offsetting position in the same contract, which extinguishes the exposure through the clearing house, or by holding to expiry and settling, which for Hong Kong index products is usually cash settlement against a final settlement price.