Understanding the CBOE: The World's Foremost Options Exchange

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The CBOE (pronounced “see-bo”) is the Cboe Options Exchange, a Chicago-based marketplace for listed options and the world’s largest options exchange. It opened in 1973 as the Chicago Board Options Exchange, the first exchange built to trade standardized options on stocks. Today it belongs to Cboe Global Markets Inc., a holding company whose businesses also include futures, U.S. and European equities, exchange-traded products, foreign exchange and volatility products such as the VIX Index.

What Is the CBOE?

The CBOE is a regulated exchange where buyers and sellers trade option contracts with fixed, published terms. An option gives its holder the right, but not the obligation, to buy (a call) or sell (a put) an underlying asset at a set strike price on or before an expiration date.

Before 1973, options in the U.S. traded over the counter. Each contract was negotiated privately, so strikes and expirations varied and reselling a contract was difficult. The CBOE, set up by members of the Chicago Board of Trade, standardized those terms. A contract on a given stock with a given strike and expiration became interchangeable with every other contract of the same series. That made options tradable in a central market for the first time.

How the CBOE Works

A trade on the CBOE moves through three layers:

1. Listing. The exchange defines each option series: the underlying, strike, expiration, exercise style and contract multiplier. Standard U.S. equity options usually cover 100 shares per contract.
2. Trading. Brokers route customer orders to the exchange, where they are matched against other orders and against quotes from market makers.
3. Clearing. After execution, the trade is cleared through the Options Clearing Corporation (OCC). The OCC began as the CBOE Clearing Corp. and became the industry clearinghouse for all U.S. listed options. It stands between buyer and seller, so neither side depends on the other’s creditworthiness.

The exchange earns revenue from transaction fees, market data and licensing of its index products.

Products Traded on the CBOE

The exchange started small: it opened in 1973 listing only call options, and put options followed in 1977. In 1990 the CBOE introduced listed LEAPS (Long-Term Equity Anticipation Securities), options with expirations longer than one year, running out to three years or more.

The current lineup includes:

• Equity and ETP options: puts and calls on thousands of stocks, ETFs and ETNs. Investors commonly use them to hedge positions or to generate income by selling covered calls or cash-secured puts.
• Index options: contracts on the S&P 500, S&P 100, Dow Jones Industrial Average, Russell indexes, selected FTSE, Nasdaq and MSCI indexes, and the sector indexes within the S&P 500.
• Strategy and specialty indexes: benchmarks that track options strategies such as put-write, butterfly and collar.
• Volatility products: the VIX Index and related volatility indexes on broad stock indexes, ETFs, individual stocks and commodities, along with futures and options tied to them.

How the VIX is read

The VIX uses real-time prices of S&P 500 options to estimate the market’s expected volatility over the next 30 days. It is expressed as an annualized percentage. It tends to rise sharply when investors expect turbulence, which is why it is called the fear gauge.

Hypothetical example: suppose the VIX reads 20, implying roughly 20% annualized volatility. To convert it to a one-month figure, divide by the square root of 12: 20 ÷ 3.46 ≈ 5.8%. Under the model’s assumptions, the options market is pricing a one-standard-deviation move of about 5.8% in the S&P 500 over the next month, in either direction, not a forecast of which way.

Worked Example: A Covered Call

Hypothetical: an investor owns 100 shares of a stock trading at $50 and sells one 30-day call with a $55 strike for a $1.20 premium per share.

• Premium received: $1.20 × 100 = $120 (before commissions and fees).
• If the stock stays below $55 at expiration, the call expires worthless. The investor keeps the shares and the $120.
• If the stock closes above $55, the shares can be called away at $55. Maximum gain is ($55 − $50) × 100 + $120 = $620.
• If the stock falls, the $120 premium offsets only part of the loss on the shares.

Because the contract is standardized and cleared through the OCC, the investor can buy the call back before expiration to close the position, rather than waiting for the original buyer.

CBOE vs. Related Terms

• CBOE vs. CBOT: the Chicago Board of Trade is a separate futures exchange, now part of CME Group. The CBOE grew out of CBOT membership but operates independently.
• Cboe Options Exchange vs. Cboe Global Markets: the first is the exchange where options trade. The second is the publicly traded parent that owns it along with other exchanges and businesses. Buying Cboe stock means owning part of the company, not an options position.
• VIX vs. VIX products: the VIX is a calculated index and cannot be bought directly. Exposure comes through VIX futures, VIX options or exchange-traded products, and their prices can diverge from the spot index.

Limitations

The CBOE is not the only U.S. options venue. Many contracts are listed on several exchanges at once, so an order may be filled elsewhere depending on how a broker routes it. Exchange standardization also limits customization: strikes, expirations and contract sizes follow the listed series. Investors who need different terms still turn to over-the-counter contracts. Finally, VIX readings describe option-implied expectations, and actual volatility can come in higher or lower.

The Bottom Line

Investors who trade or hedge with listed options deal with the system the CBOE built, where standardized contracts cleared through the OCC can be closed before expiration without relying on the original counterparty. That standardization limits custom terms, and orders may be filled on other exchanges. Anyone using the VIX should treat it as an option-implied estimate and remember that VIX products can diverge from the spot index.