Last Modified: August 11, 2026
Table of Contents
The Options Clearing Corporation — universally referred to as the OCC — is the world's largest equity derivatives clearing organisation, the sole central counterparty clearinghouse for all United States-listed options and futures contracts, and the only issuer of standardised exchange-listed equity options in the United States securities markets.
Founded in 1973 to coincide with the launch of organised exchange-listed options trading at the Chicago Board Options Exchange, the OCC has operated as the backbone of the options market for over five decades — standardising contracts, guaranteeing performance, clearing and settling trades, and managing the systemic risk that would otherwise accumulate in a market processing billions of derivatives transactions annually.
The OCC has never failed to settle a trade since its founding in 1973, making it one of the most operationally reliable financial market infrastructures in the world.
Prior to 1973, options on stocks were traded informally in the over-the-counter market without standardised terms, without a central clearinghouse, and without any institutional guarantee of performance. Contracts were bilateral agreements between individual buyers and sellers, subject to the credit risk of the specific counterparty on the other side.
If the writer of an option defaulted on their obligation to deliver shares when the contract was exercised, the holder had no recourse other than direct legal action against the defaulting individual — a slow, uncertain, and expensive remedy that made options trading unattractive to most investors.
The Chicago Board Options Exchange launched on April 26, 1973 as the world's first organised exchange for standardised equity options, initially listing standardised call options on sixteen underlying stocks. The SEC encouraged the simultaneous creation of a central clearinghouse — the OCC — to provide the institutional infrastructure necessary to make standardised exchange-listed options credible and liquid.
The OCC was established that same year as a jointly owned entity of the major options exchanges, resolving the counterparty risk problem that had limited OTC options to sophisticated bilateral transactions between well-capitalised institutions.
The OCC's creation transformed options from a niche bilateral instrument used by specialists into a standardised, transparent, exchange-listed product accessible to retail and institutional investors alike — because buyers could trust that their rights would be honoured regardless of the financial condition of the specific individual who had written their contract.
The OCC performs three interconnected functions that together make the listed options market operationally viable, financially sound, and accessible to the broad investing public.
The OCC is the sole issuer of all standardised exchange-listed equity options in the United States.
This is one of the most directly and frequently tested facts on the SIE examination, and it is counterintuitive — an Apple call option is issued by the OCC, not by Apple Inc.
A McDonald's put option is issued by the OCC, not by McDonald's Corporation. The underlying company has no role in the options market for its own shares whatsoever.
By acting as the sole issuer, the OCC creates contracts with standardised terms — the underlying security, the option type, the strike price, and the expiration date — that are identical regardless of which exchange the contract was originally traded on or which parties were involved in the transaction.
This standardisation is the foundation of options market liquidity.
Because all AAPL January 200 calls are identical regardless of when or where they were purchased, a holder of this series can sell their position to any buyer seeking the same contract, and a writer can close their obligation by buying the same series in the market — without any need to locate their original counterparty.
The OCC's most critical economic function is serving as the central counterparty — the entity that interposes itself between the buyer and seller of every options contract, becoming the buyer to every seller and the seller to every buyer through the legal mechanism of novation.
As confirmed by multiple sources including the OCC's own documentation and Grokipedia's analysis, the OCC acts as the issuer and guarantor of all standardised contracts, standing as the buyer to every seller and the seller to every buyer to mitigate counterparty risk and promote market stability.
When an options trade occurs on any United States options exchange — the CBOE, NYSE Arca Options, Nasdaq PHLX, or any other — the OCC steps between the two parties immediately after the trade executes. The original buyer and seller are no longer direct counterparties to each other.
The buyer's counterparty is the OCC, and the seller's counterparty is the OCC. The original seller's identity is irrelevant to the buyer — the OCC has guaranteed the performance of the obligation regardless of what happens to the original seller.
This guarantee is what makes listed options credit-risk-free from the option buyer's perspective.
An investor who purchases a call option has no exposure to the creditworthiness of the specific writer who sold them the contract. If the writer defaults — if they are unable to deliver shares at the strike price when the option is exercised — the OCC ensures the buyer receives what they are owed, drawing on margin collateral collected from the writer and, if necessary, the OCC's own clearing fund.
The OCC manages the obligations of all its clearing members — the broker-dealers who are direct OCC members — collecting margin and maintaining a clearing fund to ensure all contracts are honoured.
The OCC operates as the clearinghouse for all options transactions — processing and settling every trade that occurs on any United States options exchange.
Clearing encompasses the post-trade processes of matching and confirming trades, calculating net positions across all clearing members, collecting and disbursing premium payments between buyers and sellers, managing the daily variation margin flows from mark-to-market revaluation of open positions, and processing exercises and assignments.
Option trades settle in one business day — T plus one — meaning premium payments between buyer and seller are exchanged one business day after the trade date.
The OCC manages these settlement flows through its clearing members — the registered broker-dealer firms that are OCC members and that intermediate between their customers and the OCC. Retail investors deal with their own broker-dealer, not directly with the OCC. Their broker-dealer deals with the OCC as a clearing member.
When an option holder elects to exercise — or when the OCC automatically exercises an in-the-money option under the exercise-by-exception procedure — the OCC manages the assignment process that identifies which short option position holder is obligated to perform.
The OCC receives the exercise notice from the exercising party's clearing member and randomly selects a clearing member with an open short position in the same option series to receive the assignment.
The selected clearing member is then obligated to assign the exercise notice to one of its customers holding a short position in that series, using either a random selection or a first-in-first-out method. The entire process — from exercise notice to assignment of obligation — is managed through the OCC's systems without the exercising party knowing who specifically has been assigned.
As confirmed by FINRA's assignment resources, the OCC randomly allocates assignments to clearing members with accounts having short option positions. The writer who has been assigned has no choice — they must perform their obligation to sell shares at the strike price in the case of a short call, or purchase shares at the strike price in the case of a short put, with the resulting stock transaction settling T plus one on the following business day.
The OCC's exercise-by-exception procedure — commonly abbreviated as Ex-by-Ex — is one of the most examination-relevant aspects of OCC operations. Under this procedure, the OCC automatically exercises any equity option that is in the money by at least one cent per share — the minimum threshold — at expiration, unless the holder provides contrary instructions to their broker-dealer before the applicable cutoff time.
The automatic exercise threshold is one cent in the money — not zero, not one dollar, but one cent per share at expiration.
This threshold prevents the inadvertent abandonment of slightly in-the-money options by investors who forgot to submit exercise instructions. A call option with a fifty dollar strike price when the stock closes at fifty dollars and one cent is automatically exercised. An option closing at exactly the strike price — at the money — is not automatically exercised.
Under FINRA Rule 2360, the cutoff for customer instructions regarding exercise at expiration is five-thirty PM Eastern Time on the expiration day.
Customers who do not wish to exercise an option that is automatically in the money — perhaps because the cost of exercising and immediately selling the resulting shares would be less than the transaction costs involved — must provide contrary exercise instructions to their broker-dealer before this cutoff.
This interaction — the OCC's one-cent automatic exercise threshold combined with the five-thirty PM FINRA Rule 2360 cutoff — is directly tested in its specific details on the Series 7 examination.
Option buyers pay the full premium at purchase and have no further obligation — they cannot lose more than the premium paid regardless of what happens to the underlying security. No margin is required from option buyers beyond the premium itself.
Option writers — sellers — accept ongoing obligations and must post margin as collateral to ensure they can perform those obligations if assigned. The OCC establishes and collects margin from its clearing members based on each member's aggregate net options position. Individual broker-dealers then collect margin from their customers who write options.
As confirmed by the OCC's equity options product specifications, writers of uncovered — naked — puts or calls must deposit and maintain one hundred percent of the option proceeds — the premium received — plus twenty percent of the aggregate contract value — the current equity price multiplied by one hundred — minus the amount by which the option is out of the money, subject to specified minimums.
This complex formula ensures that writers maintain sufficient collateral to cover potential adverse price movements in their short positions.
Writers of covered calls — calls backed by long stock positions — are not required to post additional cash margin because the underlying stock itself serves as collateral. The broker-dealer holds the stock and can deliver it to satisfy the call obligation if assigned.
The OCC operates under the dual jurisdiction of two federal regulators reflecting the instruments it clears. The SEC oversees the OCC's role as a clearing agency for securities options under Section 17A of the Securities Exchange Act of 1934. The CFTC oversees the OCC's role in clearing futures and options on futures under the Commodity Exchange Act.
The Financial Stability Oversight Council designated the OCC as a Systemically Important Financial Market Utility — commonly abbreviated SIFMU — under Title VIII of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010.
The SIFMU designation reflects the OCC's critical role in the financial system — its failure or disruption could transmit losses across the entire options market and into the broader financial system.
The designation subjects the OCC to enhanced prudential standards, additional oversight by the Federal Reserve Board, and heightened risk management and liquidity requirements designed to ensure the OCC can withstand the default of its largest clearing member even during a period of severe market stress.
The OCC clears more than seven billion contracts annually across all United States options exchanges — making it the world's largest equity derivatives clearing organisation by volume.
It serves more than one hundred clearing member firms — the registered broker-dealers who are direct OCC members and who collectively represent the entire industry of firms offering options trading to retail and institutional clients. The OCC's clearing members include every major broker-dealer in the United States.
The OCC also provides clearing services for securities lending transactions — a function added to its portfolio of services as the organisation expanded beyond its original options-only mandate. This expansion reflects the OCC's role as critical financial infrastructure serving multiple segments of the securities markets beyond exchange-listed options.
The OCC is tested on the SIE, Series 7, and Series 65 examinations in the context of the options market structure, the issuer of listed options, the central counterparty guarantee, the exercise and assignment process, and the exercise-by-exception rule.
The OCC — Options Clearing Corporation — was founded in 1973 alongside the launch of the Chicago Board Options Exchange, the world's first organised exchange for standardised equity options.
It is the sole issuer of all standardised exchange-listed equity options in the United States — options on any company's stock are issued by the OCC, not by the underlying company.
As central counterparty, the OCC interposes itself between the buyer and seller of every listed options contract through novation — becoming the buyer to every seller and the seller to every buyer — eliminating counterparty credit risk entirely for option buyers.
The OCC has never failed to settle a trade since its founding. It clears over seven billion contracts annually and serves over one hundred clearing member firms.
The OCC manages the exercise and assignment process by receiving exercise notices and randomly allocating them to clearing members with open short positions of the same series.
The exercise-by-exception rule automatically exercises any equity option in the money by one cent or more at expiration unless the holder provides contrary instructions before the five-thirty PM Eastern Time cutoff under FINRA Rule 2360.
Option buyers pay the full premium and require no additional margin — their maximum loss is the premium. Option writers must post margin collateral — uncovered put and call writers deposit one hundred percent of option proceeds plus twenty percent of aggregate contract value minus any out-of-the-money amount.
The OCC operates under SEC jurisdiction for securities options under Section 17A of the Exchange Act, CFTC jurisdiction for futures, and is designated a Systemically Important Financial Market Utility by FSOC under the Dodd-Frank Act.
