Clearing House

A clearing house, formally a clearing agency, is an institution registered with and regulated by the SEC that sits between the buyer and seller in a securities or derivatives transaction, guaranteeing that the trade will be completed as agreed even if one of the original two parties defaults. The SEC states the central counterparty function in a single sentence: "a clearing agency performs the functions of a CCP when it interposes itself between the counterparties to securities transactions, acting functionally as the buyer to every seller and the seller to every buyer." Once a trade is submitted for clearing, each trader's actual counterparty becomes the clearing house itself rather than the other trader.

A clearing agency can also perform a second, distinct function, that of a central securities depository, which the SEC describes as operating "a centralized system for the handling of securities certificates." That role is about custody and recordkeeping, tracking who owns what, rather than about guaranteeing performance. In US markets the two functions are split across a small number of specialized institutions: the National Securities Clearing Corporation and the Depository Trust Company, both subsidiaries of the Depository Trust & Clearing Corporation (DTCC), handle equities and most other securities, and the Options Clearing Corporation performs the equivalent role for listed options.

Interposition is the whole mechanism, and it is what makes an ordinary investor's trade safe to enter with a stranger. Before a trade clears, it is an agreement between two specific parties, each exposed to the other's ability to actually deliver cash or securities. Once the clearing house steps in, that single trade is replaced by two: the original buyer now faces the clearing house as their counterparty, and the original seller does too. If one of the original two parties later fails, the clearing house, not the other original party, absorbs that failure and still completes the transaction for the party who performed. Retail investors never negotiate directly with the person on the other side of their trade, and this substitution is the specific reason that arrangement is safe rather than reckless.

Netting is the second function bundled into the same institution, and it reduces the sheer volume of what actually has to move. A clearing house does not settle every individual trade one by one; it nets each member firm's total obligations across an entire trading session into one net amount owed or due, dramatically reducing the number and size of the actual payments and deliveries required to settle a day's activity. This netting function is why clearing houses can process an enormous volume of trades without a corresponding volume of individual settlements.

The clearing function and the settlement-timing function are related but distinct, and this page deliberately keeps them separate. The clearing house guarantees that a trade will complete; the settlement date is when it actually does, currently one business day after the trade under the standard cycle our page on the settlement date covers. A trade can be cleared, in the sense of being guaranteed, well before the cash and securities have actually finished changing hands.

The word "clearing house" gets confused with an entirely unrelated institution because of a shared word, and the two have nothing to do with each other. The Automated Clearing House, commonly called ACH, is a network for processing bank payments such as direct deposits and bill payments, covered on our own page for the ACH transfer. It performs a netting-and-settlement function for bank payments, which is superficially similar in spirit to what a securities clearing house does for trades, but it is a completely separate system, run by a different set of institutions, serving an entirely different market. Nothing on this page describes the ACH payments network.

The 2008 financial crisis sharpened regulatory attention on this institution's own risk, because a clearing house that fails would remove the very guarantee the whole system relies on. Reforms following the crisis pushed a larger share of derivatives trading, historically arranged privately between two parties, onto centrally cleared venues specifically to gain this guarantee and reduce the kind of counterparty risk that a private, off-exchange derivative carries, a distinction our page on the derivative describes in general terms.

A buyer and seller agree to a trade on an exchange. The trade is submitted to the clearing house, which interposes itself, becoming the seller to the original buyer and the buyer to the original seller. The clearing house nets each member firm's total obligations across the session and manages the actual exchange of cash and securities at settlement.

A hypothetical illustration of the guarantee. Suppose Investor A buys 100 shares from Investor B for $5,000 through their respective brokers, and the trade is submitted for clearing. If Investor B's broker were to fail before delivering the shares, Investor A does not lose the trade: the clearing house, having already interposed itself as the counterparty, ensures Investor A still receives the 100 shares (or an equivalent value), drawing on the resources and safeguards, including a fund contributed to by all clearing members, that exist specifically to absorb a member's default. Investor A never had to assess Investor B's creditworthiness in the first place, because the trade was never actually a bet on Investor B's ability to perform once the clearing house stepped in.

Pros

• Removes the need for individual traders to assess each other's creditworthiness, because the clearing house's own guarantee stands behind every cleared trade.
• Netting dramatically reduces the volume of individual payments and deliveries required to settle a trading session, which lowers costs and operational risk across the whole market.
• Concentrates default risk into a small number of heavily regulated, well-capitalized institutions built specifically to absorb it, rather than leaving it spread unevenly across every pair of traders.
• Provides the infrastructure that makes anonymous exchange trading, where buyers and sellers never know who is on the other side, workable at all.

Cons

• Concentrates a large share of the market's counterparty risk into a small number of institutions, so a failure at the clearing house itself would be a systemic event rather than a single-trade problem.
• The guarantee applies to completing the trade as agreed; it does not protect against the security itself losing value, which is an entirely separate risk.
• Members of the clearing house contribute to shared default funds, so a large failure by one member can, in an extreme scenario, draw on resources contributed by others.
• The institution's central role makes it a natural focus of financial regulation, and changes to that regulation can affect the cost and availability of clearing for certain products.