From CME Group: 2025-06-05 18:46:00

1. The naming convention for Weekly Treasury Options (WTOs) includes a symbol, week of the month, month code, and year. Different symbols represent each day of the week, with specific codes for each tenor of Treasury futures.
2. At any given time, two expirations for Monday-Thursday WTOs and three for Friday WTOs will be listed for each Treasury futures product, with varying days to expiration.
3. New WTO expirations will be listed three hours after the current option expires, with specific dates for each day of the week.
4. Monday-Thursday WTOs will auto-exercise in or out-of-the-money options at 2:00 p.m. CT, while Friday WTOs allow contrary instructions until 4:00 p.m. CT.
5. If a WTO expiration falls on a holiday, it will not be listed, and Friday options will expire on the previous business day.
6. Strike increments for WTOs vary by Treasury product, ranging from 1/8 of one point for 2-Year Note options to ½ of one point for U.S. Treasury Bond options.
7. All WTOs exercise physically into their underlying Treasury futures contracts, following the Options Expiration Calendar for specific quarterly contract exercise.
8. For additional questions, contact David Reif, Executive Director of Interest Rates, or Brendan Wilson, Manager of Interest Rates.

Read more at CME Group: FAQ – New Treasury options for each day of the week