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The minimum tick increment is defined in the instrument’s Security Definition (tag 35-MsgType=d) message in tag 969-MinPriceIncrement. The Variable Tick Table (VTT) values are defined in the instrument’s Security Definition (tag 35-MsgType=d) message in tag 6350-TickRule value.

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Table of Contents

SOFR User Defined Options Spreads Examples

The following examples illustrate how tick increments are determined for the SOFR complex.

Example 1: All Legs are Fixed 1/4 Tick

If all legs are fixed 1/4 tick, the spread will be fixed 1/4 tick.

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  • 969-MinPriceIncrement=.25

Example 2: Legs are Mix of 1/4 Tick and VTT=12

If the legs are a mix of 1/4 tick and VTT=12, the spread will be VTT=12.

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  • 969-MinPriceIncrement=VTT

Example 3: All Legs are VTT=12

If all legs are VTT=12, the spread will be VTT=12.

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  • 969-MinPriceIncrement=VTT

Example 4: A Leg is 1/2 Tick

If any leg is 1/2 tick, the spread will be 1/2 tick.

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UDS Tick Result

  • 969-MinPriceIncrement=.5

Example 5: Bundle Exception

In this example, the legs are a combination of 1/4 tick and VTT=12, but a bundle is part of the UDS and the expiry date of the underlying future and option are the same. As a result, the smallest tick (.25) is used.

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