iLink 2 Order Cancel-Replace Request

Standard Header - Client to CME Globex

MsgType

String(2)

G=Order Cancel Replace Request

Y

Header tag identifying message type.

1

Account

String(12)

Y*

Executing account mnemonic as agreed between the broker and clearing member firm.
Note: If this value is changed from the original value submitted in the New Order message, the order will lose priority in the order book.

See Trade Cancellation for additional information.

11

ClOrdID

String(20)

Y

Unique order identifier assigned and maintained by client system.

Client system must maintain uniqueness of this value for the life of the order i.e. throughout the series of cancel/replace requests.

Refer to iLink - CME Globex Identifiers for more information.

37

OrderID

String(17)

Y*

CME Globex assigned order identifier; globally unique for each message published.

Note: Tag 37 value sent from client system to CME Globex must exactly match the value CME Globex assigned.

21

HandInst

Char(1)

1=Automated execution

N

Order submitted for automated matching on CME Globex.

38

OrderQty

Int(9)

Y*

Order quantity. Must be a positive integer.

Note: If this value is reduced from the original value submitted in the New Order message, the order will maintain priority in the order book. If this value is increased, the order will lose priority on the order book.

• An Order Cancel/Replace Request submitted with quantity greater than the Max Quantity and less than 99999 will be rejected with 35=8.

• An Order Cancel/Replace Request submitted with quantity greater than 99999 will be rejected with 35=3.
  Maximum Quantity is defined in the market data Security Definition (MsgType-tag 35-d) message in tag 1140-MaxTradeVol.

• For GC2, An Order Cancel/Replace Request submitted with a quantity greater than the allowed clip size will be rejected with a Session Level Reject (35=3) with tag 58-Text= 'Credit Limit Violation: Order Quantity x exceeds Clip Size: y'.

1031

CustOrderHandlingInst

String(1)

W - Desk

Y - Electronic (Default)

C - Vendor-provided Platform billed by Executing Broker

G - Sponsored Access via Exchange API or FIX provided by Executing Broker

H - Premium Algorithmic Trading Provider billed by Executing Broker

D - Other, including Other-provided Screen

Y

Defines source of original order.

40

OrderType

Char(10)

1=Market order (with protection)
2=Limit order
3=Stop order (with protection)
4=Stop-Limit order
K=Market-Limit order

Y

Order type. See iLink Order Types for complete details. 

The state of an order type can change over the life of an order. For example, a submitted stop order (3) can turn into a market order (1) when the stop price level has been crossed.
Also refer to Order Types for Futures and Options.

41

OrigClOrdID

String(20)

Y

Last accepted ClOrdID in the order chain. If a value is included in tag 41-OrigClOrdID, the same value is returned, however, if no value is sent, a value of '0' is returned in the Execution Report - Cancellation (tag 35-MsgType=8) message or tag 41-OrigClOrdID is not sent.

Refer to iLink - CME Globex Identifiers for more information.

44

Price

Price(20)

C

Required for limit or stop-limit orders. Designates the price per single contract unit.
The decimal, and if applicable the negative sign of the price are each one character. Client systems should not supply more than 9 characters to the left and 9 characters to the right of the decimal.

See Fractional Pricing for products that tick fractionally but must be submitted in decimal.

Note: If this value is changed from the original value submitted in the New Order message, the order will lose priority in the order book.

54

Side

Char(1)

1=Buy
2=Sell

Y

Side of order.

55

Symbol

String(6)

N

This tag contains the Group Code of the instrument.

If this tag is not sent on the inbound message, CME Globex will return the correct tag 55 value on all related outbound messages.

58

Text

String(18)

N

Free format text string.

59

TimeInForce

Char(1)

0=Day
1=Good Till Cancel (GTC)
3=Fill and Kill
6=Good Till Date

N

Specifies how long the order remains in effect. If not present, DAY order is the default.

Note: If this value is changed from the original value submitted in the New Order message, the order will maintain priority in the order book.

For GTD, ExpireDate is required.
For FAK, MinQty can also be specified.

See Order Types for Futures and Options or Order Qualifiers for more information.

1028

ManualOrderIndicator

Boolean(1)

Y=manual
N=automated

Y*

'N' indicates the message was generated by automated trading logic.

Note: iLink messages containing a value other than 'Y' or 'N' in this tag will be rejected.

This tag is subject to Rule 536.B.2 Electronic Audit Trail Requirements for Electronic Order Routing/Front-End Systems.

60

TransactTime

UTCTimestamp(21)

Y

UTC format YYYYMMDD-HH:MM:SS.sss
e.g. 20091216-19:21:41.109

78

NoAllocs

NumInGroup(1)

1

C

Always set to '1'.
Indicates the number of give up accounts. CME Globex supports only 1 give up account.
Must be used in conjunction with tag 9708-CmtaGiveupCD, tag 9707-GiveupFirm and tag 79-AllocAccount.

79

AllocAccount

String(11)

C

Indicates a give up account number.

Must be used in conjunction with tag 9708-CmtaGiveupCD, tag 9707-GiveupFirm and tag 78-NoAllocs.

99

StopPx

Price(20)

C

Required for stop and stop-limit orders. Designates stop trigger price specified by the individual entering the order or cancel/replace. The decimal, and if applicable the negative sign of the price, are each one character. The decimal, and if applicable the negative sign of the price are each one character. Client systems should not supply more than 9 characters to the left and 9 characters to the right of the decimal. See Fractional Pricing for products that tick fractionally but must be submitted in decimal.

Note: If this value is changed from the original value submitted in the New Order message, the order will maintain priority in the order book.

107

SecurityDesc

String(20)

Y*

Unique instrument identifier.
Future Example: GEZ8
Option Example: GEZ9 C9375

110

MinQty

Int(9)

N

Minimum quantity of an order to be executed.

The value of MinQty must be between 1 and the value in tag 38-OrderQty.

The format of this tag is different from FIX protocol specifications.

This tag must be an integer.

167

SecurityType

String(3)

FUT=Future

OPT=Option

IRS=Interest Rate Swap

FXSPOT=FX Spot

N

Indicates instrument is future or option.

204

CustomerOrFirm

Int(1)

0=Customer
1=Firm

Y*

The type of business conducted.

210

MaxShow

Qty(9)

N

Maximum quantity of an order to be shown in the order book at any given time.

• The value of MaxShow must be a fixed number N between 1 and value in tag 38-OrderQty.

• If MaxShow is reduced (due to matches) to 0, then MaxShow is reset to the lesser of N or the number in tag 38-OrderQty remaining.

Note: If this value is changed from the original value submitted in the New Order message, the order will maintain priority in the order book.

Not available for some:

• FX futures

• FX options

• CME Interest Rate Options

In CME SOFR Futures products, the maximum display ratio is 1:60.

See also: Order Types for Futures and Options or Order Qualifiers.

432

ExpireDate

LocalMktDate(8)

C

Required only if tag 59-TimeInForce=Good Till Date (GTD).

CME Globex does not support tag 126-ExpireTime. Only the expiration date can be set.
Orders expire at the end of the trading session of the specified date.

7928

SelfMatchPreventionID

String(12)

C

This tag is required when market participants elect to use the optional Self Match Prevention functionality.

Non-implied orders with the same Self-Match Prevention identifier submitted with the same Executing Firm Identifier (subcomponent of tag 49-SenderCompID) will not match on CME Globex.

8000

SelfMatchPreventionInstruction

Char(1)

O=Cancel Resting
N=Cancel Aggressing

N

Indicates a cancel instruction when Self Match Prevention is triggered.

Note:

• To use tag 8000-SelfMatchPreventionInstruction, client systems must include tag 7928-SelfMatchPreventionID on the originating message

• If tag 8000-SelfMatchPreventionInstruction is not sent, the resting order will be cancelled.

9702

CtiCode

Char(1)

1=CTI 1
2=CTI 2
3-CTI 3
4=CTI 4

Y*

Customer Type Indicator (CTI)

For electronic trading CTI codes are defined as:

• CTI 1: Applies to orders entered or trades executed by an individual member for their own account, for an account they controls, or for an account in which they have an ownership or financial interest. However, transactions initiated and executed by a member for the proprietary account of a member firm must be designated as CTI 2 transactions.

• CTI 2: Applies to orders entered or trades executed for the proprietary accounts of a member firm, including Rule 106.H., I., N., R. and S. firms.

• CTI 3: Applies to orders entered by a member or a nonmember terminal operator for the account of another individual member or an account controlled by such individual member.

• CTI 4: Applies to all orders and transactions not included in CTI categories 1, 2, or 3. These typically are orders entered by or on behalf of nonmember entities.

This tag is subject to Rule 536.D Customer Type Indicator (CTI) Codes and to 536.B.2 Electronic Audit Trail Requirements for Electronic Order Routing/Front-End Systems.

If you are unsure of which value to use, contact CME Group Market Regulation.

Note: If this value is changed from the original value submitted in the New Order message, the order will maintain priority in the order book.

1731

AvgPxGroupID

String(20)

N

Used to identify account numbers or orders for grouping trades together for average price calculations.

If incoming value is greater than max length, iLink will return the right-most twenty bytes.

1598

ClearingTradePriceType

String(1)

0 – Trade Clearing at Execution Price
1 – Trade Clearing at Alternate Clearing Price

N

Indicates whether spread differential trade is clearing at execution price (tag 31-LastPx) or alternate clearing price (i.e. previous day’s settlement price).

819

AvgPXIndicator

Int(3)

0 – No Average Pricing (Default)
1 – Trade is part of an Average Price Group Identified by the AvgPxGroupID
3 - Notional Value Average Pricing with Average Price Group Identified by the AvgPxGroupID

N

Indicates if the resulting trade is to be average priced.

This tag is also used to indicate type of average price grouping.

5149

Memo

String(75)

N

Allows users to submit a free-form Note tag with a customer order and persists from order entry through clearing

Note: if tag 5149-Memo value on inbound messages exceeds the max length of 75 bytes, iLink will return a truncated 75 bytes from the right on the response.

9717

CorrelationClOrdID

String(20)

Y*

This tag should contain the same value as the tag 11-ClOrdID of the original iLink 2 New Order message and is used to correlate iLink messages associated with a single order chain.

Refer to iLink - CME Globex Identifiers for more information.

9768

OFMOverride

Char(1)

N=Disabled (default)
Y=Enabled

N

Indicates whether the cancel/replace supports IFM. IFM disabled is default behavior (N or tag not present).

See In-Flight Mitigation (IFM) for additional information.

iLink 2 Standard Message Trailer

End of message.