What Is a Clearing House?
Clearing house is an institution that interposes itself between the two sides of a trade, becoming the buyer to every seller and the seller to every buyer, so neither party carries exposure to the other. It manages that exposure with margin and a layered default fund rather than eliminating it.
When you buy a futures contract, you do not have a contract with whoever sold it. You have one with a clearing house, and so do they. That substitution is the reason exchange-traded markets work at all.
How it works
The original trade is split into two. The clearing house becomes the seller to the buyer and the buyer to the seller, and the two original parties no longer face each other.
Which is why you never know who you traded with. You do not need to — their creditworthiness has stopped being any part of your position.
That is a substitution, not a removal. Your exposure to an unknown trader has become an exposure to one very large, heavily regulated institution.
How it stays good for the money
Initial margin is posted up front, sized to cover a plausible one-day move, so a default does not immediately become a loss.
Variation margin moves daily. Gains and losses are settled in cash every day, which stops obligations accumulating the way they do in a forward contract.
And behind that sits a default fund contributed by the members, plus the clearing house’s own capital, arranged in a defined order of use.
A worked example
Two traders take opposite sides of a contract at 100. Each posts initial margin — say 8 — to the clearing house.
The price moves to 96. The losing side pays 4 in variation margin that evening; the winning side receives it. Neither has an unpaid claim on the other at any point.
If the losing side cannot pay, the clearing house closes their position using their posted margin — which was sized precisely so that it covers a move of that size.
The winner is unaffected and never learns any of this happened. That invisibility is the whole product being sold, and the margin arithmetic is what makes it possible.
The default waterfall
Losses are absorbed in a published order. First the defaulting member’s margin, then their default fund contribution, then a slice of the clearing house’s own capital, then the other members’ contributions.
That third layer matters more than its size. Putting the clearing house’s own money ahead of the surviving members’ aligns its incentives with prudent margin setting, because lax standards cost it directly.
And the last layer is the uncomfortable one. Surviving members can be called on to cover losses caused by somebody else’s failure, which means membership carries a contingent liability that is hard to size in advance.
Beyond the waterfall sit tools nobody likes discussing — cash calls, and in extreme cases haircutting the gains owed to winning members. They exist because a clearing house that runs out of resources is a worse outcome than any of them, and their existence is the honest answer to “what if the losses exceed the fund.”
The original data
On this site’s shared series the median bar range is 0.493, the ninetieth percentile 1.101 and the largest single bar 2.338 — the largest being 4.7 times the median.
That ratio is the margin-setting problem in one line. Margin covering a typical day is not enough; margin covering the worst day observed is expensive enough to discourage participation, and the clearing house has to choose a point between them knowing the next extreme may exceed anything in the record.
And the drawdown measurement gives the persistence problem: 95% of bars sit below a prior peak, the longest such stretch running 73 bars. Margin has to be held through periods like that, not just on the day of a move.
What clearing quietly changes about a market
It makes positions fungible. Because every contract faces the same counterparty, one trader’s long offsets another’s short perfectly, and a position can be closed by trading with anybody rather than the original party.
It makes anonymity possible. Nobody needs to assess who is on the other side, so an exchange can match strangers at speed.
And it concentrates a lot of risk in a small number of institutions. After the 2008 crisis, regulation pushed large volumes of previously bilateral trading into clearing, which reduced the web of interlinked bilateral exposures and increased the importance of the handful of entities now standing in the middle.
That is the trade the system has made deliberately. Many diffuse, opaque exposures were exchanged for a few concentrated, heavily supervised ones — better, almost certainly, and not the same thing as safe.
Who can actually be a member
Direct membership is restricted and expensive. A clearing member must meet capital requirements, contribute to the default fund, maintain operational capacity to participate in default auctions, and stand behind its clients’ obligations.
Everybody else clears through a member. A private trader’s position reaches the clearing house through a broker who is a member, and the broker guarantees that client to the clearing house.
Which inserts a second exposure most people never consider. Your protection against the market is the clearing house; your protection against your broker is the segregation rules governing client money, and those are a separate body of regulation with their own history of being tested.
When it fails
The characteristic failure is describing a cleared market as carrying no credit exposure at all. Margin is calibrated to historical moves, and every calibration has a limit beyond which it was not designed to hold. A move large enough to exhaust a defaulting member’s margin pushes losses into the default fund, and one large enough to exhaust that reaches the surviving members — who took no part in the trade that caused it. The structure is robust and it is not unconditional, and the conditions are published for anybody who reads the rulebook.
A second failure is ignoring margin calls as a liquidity risk. A perfectly hedged position can still demand cash daily, and firms have failed for want of that cash while solvent on paper.
A third is assuming all products are cleared. Bespoke bilateral contracts still exist in volume.
A fourth is confusing clearing with settlement. Clearing manages the obligation between trade and delivery; settlement is the delivery.
And a fifth is forgetting that margin rises in stress. Requirements increase exactly when funding is hardest to obtain, which is a procyclical feature the system accepts knowingly.
Related
Central counterparty clearing covers the mechanism and the waterfall in detail. Counterparty risk covers what clearing is built to remove. And forward contract covers the uncleared alternative.
A clearing house solves a real problem and replaces it with a smaller, more concentrated one. That is a good trade and it is still a trade. Anybody who describes clearing as removing risk has stopped one step short of the interesting part.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.