# Clearing Houses and Central Counterparties

> Clearing houses stand between buyers and sellers so every trade is honoured. Learn how central counterparties work, margin, default funds and why they matter.

Source: https://learn.tradelabsai.com/market-structure/clearing-houses/  
Track: Market Structure · Level: Intermediate · Updated: 2026-10-03  
Publisher: TradeLabs AI (https://tradelabsai.com). Education, not financial advice.  
Cite as: TradeLabs Learn, "Clearing Houses and Central Counterparties", https://learn.tradelabsai.com/market-structure/clearing-houses/

A clearing house, also called a central counterparty (CCP), stands in the middle of every trade on an exchange. Once a trade is matched, the clearing house becomes the buyer to every seller and the seller to every buyer. That way, nobody has to worry whether the stranger on the other side will pay. If one member defaults, the clearing house steps in. It is one of the least visible and most important parts of the financial system.

## How central clearing works

1. **Trade:** a buyer and seller agree a trade on an exchange.
2. **Novation:** the clearing house replaces the original contract with two new ones: it buys from the seller and sells to the buyer.
3. **Netting:** it offsets each member's purchases against its sales, so only net amounts need to move.
4. **Risk management:** it collects margin and marks positions to market daily.
5. **Settlement:** cash and securities move, or derivatives settle, according to the rules.

**Example: Netting in action**
During a day, a broker's clients buy 50,000 shares of a stock and sell 46,000 shares of the same stock. Instead of settling 96,000 shares of trades, the clearing house nets them: the broker receives 4,000 shares and pays for that net amount. Netting across all members can reduce the value that actually needs to be settled by a very large percentage.

## The defences against default

Clearing houses use several layers of protection, often called a **default waterfall**:

| Layer | What it is |
|---|---|
| Initial margin | Collateral each member posts to cover potential losses on its positions |
| Variation margin | Daily (sometimes intraday) payments of gains and losses |
| Defaulter's default fund contribution | The failing member's own contribution to a shared fund |
| Clearing house capital | The CCP's own money, "skin in the game" |
| Shared default fund | Contributions from all members |
| Further assessments | Extra calls on surviving members, within limits |

Because positions are marked to market daily, losses cannot build up unseen for long. See [Mark-to-Market](https://learn.tradelabsai.com/markets/mark-to-market/) and [Futures Margin: Initial and Maintenance](https://learn.tradelabsai.com/futures/futures-margin/).

## Major clearing houses

- **DTCC** (through its subsidiaries NSCC and DTC) clears and settles most US stock trades.
- **Options Clearing Corporation (OCC)** clears all US listed options.
- **CME Clearing** clears CME Group futures and options.
- **ICE Clear** clears ICE's futures and many credit derivatives.
- **LCH** clears a large share of the world's interest rate swaps.

## Why clearing houses matter

- **They remove counterparty risk** for traders on exchanges. Your trade is guaranteed even if the original counterparty fails.
- **They make anonymous trading possible,** because you never need to judge the other side's creditworthiness.
- **They reduce systemic risk,** which is why regulators required many OTC derivatives to be centrally cleared after the 2008 crisis. See [Systemic Risk](https://learn.tradelabsai.com/portfolio/systemic-risk/).
- **They concentrate risk,** which is why they are heavily regulated and stress tested: a failing clearing house would be a serious event.

## Clearing and you

Most traders never interact with a clearing house directly. Your broker, or the clearing firm it uses, is the clearing member. Effects you might notice include margin requirements set partly by clearing houses, higher margins during volatile periods and settlement timing. In January 2021, sharp rises in clearing house deposit requirements during the GameStop episode led some brokers to restrict buying in certain stocks, a rare moment when clearing became front page news.

## Frequently asked questions

### What does a clearing house do?

It becomes the counterparty to both sides of every trade, nets positions, collects margin and guarantees that trades are settled.

### What is the difference between clearing and settlement?

Clearing covers confirming, netting and managing the risk of trades until they settle. Settlement is the actual transfer of cash and assets. See [Settlement](https://learn.tradelabsai.com/markets/settlement/).

### Can a clearing house fail?

It is very rare. Clearing houses hold margin, default funds and capital to withstand member failures, but they are regulated closely because a failure would be serious.

## Sources

- Wikipedia, [Central counterparty clearing](https://en.wikipedia.org/wiki/Central_counterparty_clearing)

## Continue learning

- Next lesson: [Prime Brokers](https://learn.tradelabsai.com/market-structure/prime-brokers/)
- Previous lesson: [OTC Markets](https://learn.tradelabsai.com/market-structure/otc-markets/)
- Related: [OTC Markets](https://learn.tradelabsai.com/market-structure/otc-markets/): Over-the-counter markets trade directly between parties instead of on an exchange. Learn how OTC markets work for stocks, bonds, forex and derivatives.
- Related: [Settlement](https://learn.tradelabsai.com/markets/settlement/): Settlement is when cash and securities actually change hands after a trade. Learn settlement cycles like T+1, cash vs physical settlement and how it affects you.
- Related: [Mark-to-Market](https://learn.tradelabsai.com/markets/mark-to-market/): Mark-to-market means valuing positions at today's price and settling gains and losses daily. Learn how it works in futures accounts and why it matters for risk.
- Related: [Futures Margin: Initial and Maintenance](https://learn.tradelabsai.com/futures/futures-margin/): Futures margin is a performance bond, not a loan. Learn initial and maintenance margin, day trading margin, margin calls, SPAN and how to avoid forced liquidation.
- Related: [Market, Credit and Counterparty Risk](https://learn.tradelabsai.com/portfolio/counterparty-risk/): Learn the difference between market risk, credit risk and counterparty risk, how each is measured and managed, and real cases from Lehman Brothers to FTX.
- Related: [Clearing, Settlement and Custody](https://learn.tradelabsai.com/industry/clearing-settlement-and-custody/): After a trade, clearing confirms and guarantees it, settlement exchanges cash and securities and custody holds assets safely. Learn the process, T+1 and key players.
- Related: [Systemic Risk](https://learn.tradelabsai.com/portfolio/systemic-risk/): Systemic risk is the danger that problems at one firm or market spread through the whole financial system. Learn its channels, past examples and what traders can do.