Options with Truncated Strike Prices

A subset of options on futures have truncated strike prices in the market data Security Definition message.

CME Group strongly encourages clients to use tag 202-StrikePrice to determine the strike price. However, the strike price in tag 202 for options on 2-Year T-Note futures is also truncated. For these products only, client systems using tag 202-StrikePrice must determine the full strike price by postpending "5" when the value in tag 202 ends in the numbers "2" or "7".

Options on 2-Year T-Note futures
- OZT - Options on 2-Year T-Note Futures
- VT1-VT5 - Weekly Monday Options on 2-Year T-Note Futures
- WT1-WT5 - Weekly Wednesday Options on 2-Year T-Note Futures
- ZT1 – ZT5 - Weekly Options on 2-Year T-Note Futures

Reference Data API and Reference Data Warehouse support the full strike price without truncation.

The following options on futures have truncated strike prices in tag 55-Symbol of the market data Security Definition message.

CME
- SR3 - Options on Three-Month SOFR Futures
- S0 - One-Year Mid-Curve Options on Three-Month SOFR Futures
- S2 - Two-Year Mid-Curve Options on Three-Month SOFR Futures
- SR1 - Options on One-Month SOFR Futures
- S3 - Three-Year Mid-Curve Options on Three-Month SOFR Futures
- EJ - Options on Euroyen Futures
- BTC - Options on Bitcoin Futures
CBOT
- OZQ - Options on 30-Day Federal Funds Futures
- ZQ6 - One-Year Mid-Curve options on 30-Day Federal Funds Futures
- ZQ1 - Two-Year Mid-Curve options on 30-Day Federal Funds Futures
- OZT - Options on 2-Year T-Note Futures
- VT1-VT5 - Weekly Monday Options on 2-Year T-Note Futures
- WT1-WT5 - Weekly Wednesday Options on 2-Year T-Note Futures
- ZT1 – ZT5 - Weekly Options on 2-Year T-Note Futures
- OZF - Options on 5-Year T-Note Futures
- ZF1 – ZF5 - Weekly options on 5-Year T-Note Futures
- OZN - Options on 10-Year T-Note Futures
- ZN1 - ZN5 - Weekly options on 10-Year T-Note Futures
- WY1-WY5 - Weekly Wednesday options on 10-Year T-Note Futures
- VY1 - VY5 - 10-Year Treasury Note Monday Weekly Options
- GT1-GT5 - 2-Year Treasury Note Tuesday Weekly Options
- GF1-GF5 - 5-Year Treasury Note Tuesday Weekly Options
- GY1-GY5 - 10-Year Treasury Note Tuesday Weekly Options
- GX1-GX5 - Ultra 10-Year Treasury Note Tuesday Weekly Options
- GB1-GB5 - U.S. Treasury Bond Tuesday Weekly Options
- GU1-GU5 - Ultra U.S. Treasury Bond Tuesday Weekly Options
- HT1-HT5 - 2-Year Treasury Note Thursday Weekly Options
- HF1-HF5 - 5-Year Treasury Note Thursday Weekly Options
- HY1-HY5 - 10-Year Treasury Note Thursday Weekly Options
- HX1-HX5 - Ultra 10-Year Treasury Note Thursday Weekly Options
- HB1-HB5 - U.S. Treasury Bond Thursday Weekly Options
- HU1-HU5 - Ultra U.S. Treasury Bond Thursday Weekly Options

If using tag 55-Symbol to determine the strike price, the following rules apply:

CME products:
- If strike ends in "2" or "7", postpend "5"
CBOT products
- If strike ends in "2" or "7", postpend "5"
- If strike ends in "1" or "6", postpend "25"
- If strike ends in "3" or "8", postpend "75"