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This topic describes how to obtain and display tick size and pricing data for products traded on CME Globex.  

Info

Price formats across different market data protocols will not always match. For example, ITC uses open outcry price conventions while MDP 3.0 uses electronic trading conventions.

Table of Contents

Tick Size Calculation

The tick is the minimum price fluctuation allowed for a futures or options contract during a trading session as specified by the contract terms of CME Group. An instrument can have either a variable tick (primarily for options instruments) or a standard tick. Both the variable tick and standard tick are obtained from the Security Definition message.

Tag 6350-TickRule will contain the Variable Tick Table (VTT) index

...

code (see table below). When tag 6350-TickRule = 00, the instrument is not VTT eligible.

Info

Tag 969-MinPriceIncrement will be sent with a value representing "null" in the Security Definition (tag 35-MsgType=d) message for VTT eligible instruments.

Standard Tick Instrument

If the Security Definition (tag 35-MsgType=d) message for an instrument contains tag 6350-TickRule = 00, the instrument uses a standard tick and the value found in tag 969-MinPriceIncrement is the tick size.

...

tick size = 0.5.

Variable Tick Instrument

The following process shows how to calculate the tick size for a VTT eligible instrument.

Example

CME Globex sends the following Security Definition (tag 35-MsgType=d) message for an instrument with a price of 510:

1128=9|35=d|...|6350=1|...

  1. Tag 6350-TickRule contains the VTT index code '1'.

  2. Since tag 6350-TickRule = is 1 for a market price of 510 (P = 510 > 500), the tick size for the contract is 10.

Variable Tick Table

VTT

Code

Current CME
Globex Price

CME Globex
Tick Size

1

P < -500

10

1

-500 ≤ P ≤ 500

5

1

P > 500

10

2

-5 ≤ P ≤ 5

0.5

2

P < -5

1

2

P > 5

1

3

-10 ≤ P ≤ 10

1

3

P < -10

2

3

P > 10

2

4

P < -500

25

4

-500 ≤ P ≤ 500

5

4

P > 500

25

10

P < -300

25

10

-300 ≤ P ≤ 300

5

10

P > 300

25

11

P < -300

10

11

-300 ≤ P ≤ 300

5

11

P > 300

10

12

P < -5

0.50

12

-5 ≤ P ≤ 5

0.25

12

P > 5

0.50

13

-25 ≤ P <  25

1

13

P <  -25

5

13

P > 25

5

14

-25 ≤ P ≤ 25

2.5

14

P < -25

5

14

P > 25

5

15

P < -1000

25

15

-1000 ≤ P ≤ 1000

5

15

P > 1000

25

16

P < -5000

50

16

-5000 ≤ P ≤ 5000

25

16

P > 5000

50

Suggested Price Display Format

This section provides an approach to extracting price information from the market data Security Definition message for display by the client. As described below, some products may require a decimal to fractional price conversion prior to display.

Info

Suggested price display formats are not available for Variable Tick Table (VTT) eligible instruments.

Display Format for Non-Fractional Products

...

Info

The resulting display of price and tick below are suggested by CME Group but are not required.

Instrument

CME Globex Tick
tag 969-MinPriceIncrement

CME Globex Price

tag 270-MDEntryPx

Display Factor

tag 9787-DisplayFactor

Display Tick

Display Price

ESH2

25

113700

0.01

.25

1137.00

GEM2

.5

9886.5

0.01

.005

98.865

CME Globex Price x Display Factor = Display Price
CME Globex Tick x Display Factor = Display Tick

Strike Price Display

Observe the following when displaying strike prices:

  • For most products, clients may use the Display Factor of the underlying future to format the strike price of an option.

  • The option's Display Factor should only be used for the option trade price and tick.

Info

CME Group does not guarantee this solution will work for all option instruments due to differing market conventions between the futures and options. 

Example: SOFR Outright Underlying Future

...

Products that require a decimal-to-fractional price conversion are identified in the Security Definition message by the following tags:

  • tag 37702-MainFraction -

     Price

     Price denominator of main fraction.

  • tag 37703-SubFraction -

     Price

     Price denominator of sub fraction.

  • tag 9800-PriceDisplayFormat -

     Number

     Number of digits to the right of tick mark; location of tick mark between whole and non-whole numbers.

Info

Display Factor (tag 9787-DisplayFactor) should not be used for fractional prices.

Info

Consult the Fractional Pricing topic for more information.

Example: ZNZ9 10 Year U.S. Treasury Note Future

1128=9|9=455|35=d| ... |37702=32|37703=2|9800=3| ...

  1. Original decimal price: 112.625

  2. Fractional part after conversion 20 (.625 x 32)

  3. Integer part and fractional part 112 20

  4. Apply Price Display Format of 03 to 112.20

  5. Resulting formatted price 112'200