About the Speaker

Mat Cashman
Principal, Investor Education
OCC/The Options Industry Council
Mat Cashman is a financial services professional with 20 years of experience trading all segments of the derivatives market. He started his career on the trading floor of the Chicago Board of Options Exchange in 2000 and has since traded multiple asset classes across a wide array of exchanges. At OCC, Mr. Cashman is responsible for a comprehensive options resource center that provides information and education about options. In addition to his responsibilities with OCC, he also serves as an instructor of the Options Industry Council (OIC), conducting option seminars and presenting online webinars to all segments of the investing community.
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Speaker Schedule
Wednesday, April 22, 2026, 3:25 pm - 3:55 pm EST
Every Expiration Is Not Created Equal: American vs. European-Style Options
Mat Cashman |OCC/The Options Industry Council

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’ll 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 

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