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Every Expiration Is Not Created Equal: American vs. European-Style Options

Every Expiration Is Not Created Equal: American vs. European-Style Options

Aired On

Mar / 10 / 2026 - 12:00 pm - EST

Mathew Cashman
OCC , The Options Industry Council (OIC)

Not all options expire the same way.

In today’s market, especially with the growth of short-dated and 0DTE products, the structural differences between American-style and European-style options matter more than ever. This session breaks down how exercise rights, settlement mechanics, and expiration timing can materially impact risk, assignment, and post-close exposure.

We will cover:

  • The key structural differences between American-style and European-style options
  • How exercise and assignment risk manifests in equity and ETF options
  • Why expiration mechanics matter in short-duration trading environments
  • The role of settlement timing, after-hours price movement, and operational risk
  • Practical risk considerations for traders navigating weekly and 0DTE expirations

The goal is to move beyond surface-level definitions and help participants understand how expiration structure directly affects real-world risk.

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This material is from OCC and is being posted with its permission. The views expressed in this material are solely those of the author and/or OCC and Interactive Brokers is not endorsing or recommending any investment or trading discussed in the material. This material is not and should not be construed as an offer to buy or sell any security. It should not be construed as research or investment advice or a recommendation to buy, sell or hold any security or commodity. This material does not and is not intended to take into account the particular financial conditions, investment objectives or requirements of individual customers. Before acting on this material, you should consider whether it is suitable for your particular circumstances and, as necessary, seek professional advice.

Disclosure: Options Trading

Options involve risk and are not suitable for all investors. For information on the uses and risks of options, you can obtain a copy of the Options Clearing Corporation risk disclosure document titled Characteristics and Risks of Standardized Options by going to the following link ibkr.com/occ. Multiple leg strategies, including spreads, will incur multiple transaction costs.

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