For the latest roadmap of CME Group technology initiatives:
See the Development Launch Schedule.

Critical Updates

New Release Source IP Historical Replay Update - This Week

Effective close of business this Friday, August 11, CME Group will change source IPs MDP for TCP historical replay as follows:

IP ADDRESS CHANGE
CHANNEL NAME	CHANNEL ID	CURRENT SOURCE IP ADDRESSES	NEW SOURCE IP ADDRESSES	FTP INFORMATION
CME Benchmark Premium Administration	261	69.50.112.43	69.50.112.161	SFTP - MDP Configuration
Streamlined Channels: · Equity Indices · OTC Daily · Block Trades · CME CF Cryptocurrency Indices	200, 201, 210, 211, 212, 213, 230, 231, 232, 233, 234	69.50.112.43	69.50.112.161	SFTP - MDP Configuration
Settlements and Valuations	251, 252, 253, 254	69.50.112.43	69.50.112.161	SFTP - MDP Configuration

A new config.xml file is currently available for customer download.

NewAB Spread Type - Anchor Leg Pricing Enhancement - September 10

Effective Sunday, September 10, (trade date Monday, September 11), CME Group will enhance the spread leg price assignment method for the Averaged Price Bundle, spread type=AB. The spread leg price assignment method used when summing the spread legs and in assigning differential ticks will change from using fair market price to prior day settlement price.        

The spread legs prior day settlement price will be rounded to nearest .5 tick.

This change will be available for customer testing in the New Release on Monday, August 28.

GLink Network Infrastructure Upgrade in Aurora - Q3 2023 

In 2023, CME Group is upgrading its GLink network infrastructure at the CME Co-Location Facility in Aurora, IL. This network upgrade consists of:

• Replacement of the existing end of life (EOL) Juniper switches with new Arista switches which will utilize new customer ports and new CME IPs
• Introduction of a new GLink Demarc Cable providing customers with equidistant connectivity to any rack unit (RU) in their cabinet

The new GLink switches will also expand capacity to support future growth while the new GLink Demarc Cable will allow customers to optimize their CME Co-Location Licensed Space. The new GLink infrastructure is anticipated to be ready in Q3 2023 with customer testing and cutover to the new network taking place during Q3/Q4 2023. Further details will be communicated during Q3 2023.

Please see the Client System Impact for details and an updated FAQ.

Any immediate questions can be directed to Global Account Management.

TOP Order Allocation Maximum Quantity Enhancement - October 1

Starting Sunday, October 1 (trade date Monday, October 2), CME Group will implement an enhancement to the TOP order allocation maximum quantity for all futures and options on futures products. The overview of TOP maximum quantity enhancement is now available.  

With this change, CME Globex will no longer count initial aggressed quantity, and only count fills after the order rests in the market against the TOP MAX quantity. Currently, TOP Max includes initial aggressed quantity as well.

This enhancement is to ensure that for aggressing orders larger than the TOP Max, the entire resting amount is eligible for TOP.

This change is currently available in the New Release for customer testing.

More information about TOP functionality is available in the Client Systems Wiki.

Mandatory Migration - iLink 3 Binary Order Entry Protocol for CGW - Q1 2024

CME Group is introducing iLink 3 on Convenience Gateways (CGW) for trading futures and options on CME Globex. The iLink 3 protocol will launch on the existing CGWs on Sunday, February 4, 2024 (trade date Monday, February 5). All customers connected via CGW will need to migrate to iLink 3 by December 31, 2024.

iLink 3 includes:

• Simple Binary Encoding (SBE) for faster message encoding and decoding
• A simple, lightweight, point-to-point session layer protocol using FIX Performance (FIXP)
• More efficient iLink FIX messaging
• Standard message size, fixed positions, and fixed length fields
• A consistent encoding method for order entry and market data

The Client Impact Assessment is available and provides detailed functionality and messaging information.

Based on customer feedback and to better align with iLink 2 CGW, Cancel on Disconnect (COD) will be optional functionality for all iLink 3 CGW sessions. Customers will be able to request COD functionality to be disabled or enabled in:

• New Release – Now available
• Production – October 23, 2023

Please note that all iLink 3 CGW sessions will be created with COD enabled. Clearing Firm Administrators can disable COD functionality by entering the change request via Firm Admin Dashboard (FADB).

iLink 3 on CGW is currently available in New Release for customer testing.

AutoCert+ certification is required for all client systems using CGWs.

• Now Available – iLink 3 CGW functionality available in New Release and AutoCert+ certification for On-Demand administrative information
• September 25, 2023 – iLink 3 CGW functionality available in New Release and AutoCert+ certification for Pre-registered administrative information
• February 4, 2024 –  Production launch of iLink 3 on CGW
• December 31, 2024 – Deadline for customer migration
• January 31, 2025 - iLink 2 on CGW Decommission 

Further information on the production launch deployment schedule, and mock trading sessions will be published in upcoming CME Globex Notices.

Please contact your Global Account Manager for additional information.

Drop Copy Impacts - Mandatory iLink 3 Binary Order Entry Protocol for Convenience Gateway - Q1 2024

On Sunday, February 4, 2024 (trade date Monday, February  5), CME Group will launch the iLink 3 protocol on existing Convenience Gateways (CGW) for trading futures and options on CME Globex. All customers connected via Convenient Gateway (CGW) are encouraged to migrate to iLink 3 as early as possible prior to the iLink 2 decommission. Key events and dates are available.

Impacts of mandatory iLink 3 Binary Order Entry protocol for Convenience Gateway on Drop Copy Convenience Gateway target sessions.

• Message encoding: The Drop Copy encapsulated XML Non-Fix (tag 35-MsgType=n) Message payload sent from iLink 3 source sessions will be in ASCII format.
  • Message payload mapping conforming to the iLink 3 formats and encoding will feature deprecated message tags, additional tags and enumerations for order entry, clearing and regulatory compliance messaging specifications.
  • A summary of ASCII encoded tags with their equivalent values in Simple Binary Encoding tags and enumerations is available.
• Target Session: Current Drop Copy CGW target session users do not need to request new target sessions although upon requesting the mandatory iLink 3 source session, a new target session may be automatically created to accommodate iLink order entry infrastructure load balancing and optimization considerations. Customers are requested to check for new automatically generated Drop Copy CGW target sessions.
• Parallel period: During the parallel period which runs until December 31, 2024, CME Globex will support Drop Copy target sessions connected to both iLink 2 and iLink 3 CGW sessions. When iLink 2 is decommissioned on December 31, 2024, any Drop Copy target sessions with iLink 2 sessions only will be removed from the platform.
• AutoCert+ Certification: Certification is not required for existing Drop Copy CGW session users.

Please review Mandatory iLink 3 Binary Order Entry Protocol for CGW for additional details.

Product Launches

Listing New HDD Weather Options - This Week

Effective this Sunday, August 13 (trade date Monday, August 14), pending completion of all regulatory review periods, the following Weather options will be listed for trading on CME Globex and for submission for clearing via CME ClearPort.

Listing New HDD Weather Options
Product	MDP 3.0: tag 6937-Asset	iLink: tag 55-Symbol MDP 3.0 tag 1151 - Security Group	Market Data Channel
CME Degree Days Index Options - Boston HDD	HW	W7	317
CME Seasonal Strip Degree Days Index Options - Boston HDD Nov	HWX	W7	317
CME Seasonal Strip Degree Days Index Options - Boston HDD Dec	HWZ	W7	317
CME Degree Days Index Options - Burbank HDD	LP	W7	317
CME Seasonal Strip Degree Days Index Options - Burbank HDD Nov	LPX	W7	317
CME Seasonal Strip Degree Days Index Options - Burbank HDD Dec	LPZ	W7	317
CME Degree Days Index Options - Houston HDD	HR	W7	317
CME Seasonal Strip Degree Days Index Options - Houston HDD Nov	HRX	W7	317
CME Seasonal Strip Degree Days Index Options - Houston HDD Dec	HRZ	W7	317
CME Degree Days Index Options - Philadelphia HDD	H6	W7	317
CME Seasonal Strip Degree Days Index Options - Philadelphia HDD Nov	H6X	W7	317
CME Seasonal Strip Degree Days Index Options - Philadelphia HDD Dec	H6Z	W7	317
CME European HDD Index Options - Paris HDD	D1	W7	317
CME European Seasonal Strip Index Options - Paris HDD Nov	D1X	W7	317
CME European Seasonal Strip Index Options - Paris HDD Dec	D1Z	W7	317
CME European HDD Index Options - Essen HDD	D4	W7	317
CME European Seasonal Strip Index Options - Essen HDD Nov	D4X	W7	317
CME European Seasonal Strip Index Options - Essen HDD Dec	D4Z	W7	317

These options are currently available for customer testing in New Release.

These contracts are listed with, and subject to, the rules and regulations of CME.

Argus Butane (Saudi Aramco) Futures - This Week

Effective this Sunday, August 13 (trade date Monday, August 14), pending completion of all regulatory review periods, Argus Butane (Saudi Aramco) futures will be listed for trading on CME Globex and for submission for clearing via CME ClearPort.

Argus Butane (Saudi Aramco) Futures
Product	MDP 3.0: tag 6937-Asset	iLink: tag 55-Symbol MDP 3.0 tag 1151 - Security Group	Market Data Channel
Argus Butane (Saudi Aramco) Futures	MBA	ZZ	386

These futures are currently available for customer testing in New Release.

These contracts are listed with, and subject to, the rules and regulations of NYMEX.

Listing New CDD Weather Options - August 27

Effective Sunday, August 27 (trade date Monday, August 28), pending completion of all regulatory review periods, the following Weather options will be listed for trading on CME Globex and for submission for clearing via CME ClearPort.

Listing New CDD Weather Options
Product	MDP 3.0: tag 6937-Asset	iLink: tag 55-Symbol MDP 3.0 tag 1151 - Security Group	Market Data Channel
CME Degree Days Index Options - Boston CDD	KW	W7	317
CME Seasonal Strip Degree Days Index Options - Boston CDD May	KWK	W7	317
CME Seasonal Strip Degree Days Index Options - Boston CDD Jul	KWN	W7	317
CME Degree Days Index Options - Burbank CDD	KP	W7	317
CME Seasonal Strip Degree Days Index Options - Burbank CDD May	KPK	W7	317
CME Seasonal Strip Degree Days Index Options - Burbank CDD Jul	KPN	W7	317
CME Degree Days Index Options - Houston CDD	KR	W7	317
CME Seasonal Strip Degree Days Index Options - Houston CDD May	KRK	W7	317
CME Seasonal Strip Degree Days Index Options - Houston CDD Jul	KRN	W7	317
CME Degree Days Index Options - Philadelphia CDD	K6	W7	317
CME Seasonal Strip Degree Days Index Options - Philadelphia CDD May	K6K	W7	317
CME Seasonal Strip Degree Days Index Options - Philadelphia CDD Jul	K6N	W7	317
CME European CDD Index Options - Paris CDD	G1	W7	317
CME European Seasonal Strip Index Options - Paris CDD May	G1K	W7	317
CME European Seasonal Strip Index Options - Paris CDD Jul	G1N	W7	317
CME European CDD Index Options - Essen CDD	G4	W7	317
CME European Seasonal Strip Index Options - Essen CDD Jul	G4K	W7	317
CME European Seasonal Strip Index Options - Essen CDD Jul	G4N	W7	317

These options will be available for customer testing in New Release on Monday, August 14.

These contracts are listed with, and subject to, the rules and regulations of CME.

Product Changes

Change to Dynamic Strike Minimum Price Increment for Monthly and Weekly Friday Options on South African Rand/U.S. Dollar (ZAR/USD) Futures - This Week

Effective this Sunday, August 13 (trade date Monday, August 14), the Minimum Strike Increment for dynamic strike listing will be changed for Monthly and Weekly Friday options on South African Rand/U.S. Dollar (ZAR/USD) futures listed for trading on CME Globex and for submission for clearing via CME ClearPort.

Monthly and Weekly Friday Options on South African Rand/U.S. Dollar (ZAR/USD) futures
Product	MDP 3.0: tag 6937-Asset	iLink: tag 55-Symbol MDP 3.0 tag 1151 - Security Group	CURRENT DYNAMIC STRIKE MINIMUM PRICE INCREMENT	NEW DYNAMIC STRIKE MINIMUM PRICE INCREMENT
Monthly Options on South African Rand/U.S. Dollar (ZAR/USD) Futures	RO	A4	$0.0005 per South African Rand	$0.0001 per South African Rand
Weekly Friday Options on South African Rand/U.S. Dollar (ZAR/USD) Futures	1N-5N	A4	$0.0005 per South African Rand	$0.0001 per South African Rand

These options are currently available for customer testing in New Release.

These contracts are listed with, and subject to, the rules and regulations of CME.

Termination of Trading Amendment for Mini Argus Butane (Saudi Aramco) Futures - This Week

Effective this Sunday, August 13, (trade date Monday, August 14), the termination of trading for the Mini Argus Butane (Saudi Aramco) futures contracts will be amended on CME Globex.

TERMINATION OF TRADING AMENDMENT FOR MINI ARGUS BUTANE (SAUDI ARAMCO) FUTURES
PRODUCT	MDP 3.0: TAG 6937-ASSET	ILINK: TAG 55-SYMBOL MDP 3.0 TAG 1151 - SECURITY GROUP	CURRENT TERMINATION OF TRADING RULE	NEW TERMINATION OF TRADING RULE
Mini Argus Butane (Saudi Aramco) Futures	MAA	ZZ	Trading shall cease on the last business day of the month prior to the contract month. Business days are based on the UK Holiday calendar.	Trading shall cease on the last business day of the month prior to the contract month

These contracts are listed with, and subject to, the rules and regulations of NYMEX.

NewChanges to Listing Schedule & Temporary Suspension of Trading & Clearing for all Ukrainian Wheat (Platts), Black Sea Wheat Financially Settled (Platts), & Black Sea Corn Financially Settled (Platts) Futures & Options - August 16

Effective Friday, August 18, and pending all relevant CFTC regulatory review periods, the listing schedule will be changed for all Ukrainian Wheat (Platts), Black Sea Wheat Financially Settled (Platts), and Black Sea Corn Financially Settled (Platts) futures and options, and additional contracts will cease to be listed.

On Monday, July 31, at the close of business, these contracts were suspended from trading and clearing until further notice.

There is no open interest in these contracts.

Changes to Listing Schedule for all Ukrainian Wheat (Platts), Black Sea Wheat Financially Settled (Platts), and Black Sea Corn Financially Settled (Platts) Futures and Options and the Temporary Suspension of Trading and Clearing
PRODUCT	MDP 3.0: TAG 6937-ASSET	ILINK: TAG 55-SYMBOL MDP 3.0 TAG 1151 - SECURITY GROUP	Current Listing Schedule	New Listing Schedule
Ukrainian Wheat (Platts) Futures	UWF	WP	List current contract month through the October 2024 contract month	List 15 consecutive months
Options on Ukrainian Wheat (Platts) Futures	UWO	W2	List current contract month through the July 2024 contract month	List 12 consecutive months
Options on Black Sea Wheat Financially Settled (Platts) Futures	BWO	W2	List current contract month through the July 2024 contract month	List 12 consecutive months
Options on Black Sea Corn Financially Settled (Platts) Futures	BSO	CG	List current contract month through the July 2024 contract month	List 12 consecutive months
Black Sea Corn Financially Settled (Platts) Futures	BCF	CS	List current contract month through the October 2024 contract month	List 15 consecutive months
Black Sea Wheat Financially Settled (Platts) Futures	BWF	WP	List current contract month through the October 2024 contract month	List 15 consecutive months

These contracts are listed with, and subject to, the rules and regulations of CBOT.

Listing Cycle Expansion and Changes to Strike Price Listings for E-mini S&P 500 Products  - August 20

Effective Sunday, August 20 (trade date Monday, August 21), the following changes will be made for E-mini S&P 500 products:

• Expansion of the listing cycle for the following E-mini S&P 500 futures, BTICs, TACOs, and weekly options on CME Globex
• Change to the strike price listing rule for European-style E-mini S&P 500 options on CME Globex and for submission for clearing via CME ClearPort

LISTING CYCLE EXPANSION FOR E-MINI S&P 500 FUTURES, BTICS, TACOs AND WEEKLY OPTIONS
PRODUCT	MDP 3.0: TAG 6937-ASSET	ILINK: TAG 55-SYMBOL MDP 3.0 TAG 1151 - SECURITY GROUP	CURRENT LISTING SCHEDULE	NEW LISTING SCHEDULE
E-mini Standard and Poor’s 500 Futures	ES	ES	Quarterly contracts (Mar, Jun, Sep, Dec) listed for 9 consecutive quarters and 3 additional December contract months	Quarterly contracts (Mar, Jun, Sep, Dec) listed for 21 consecutive quarters
BTIC on E-mini S&P 500 Futures	EST	SB
TACO on E-mini S&P 500 Futures	ESQ	3T
E-mini Standard and Poor’s 500 Weekly Options - Week 1‑4	EW1-EW4	EW	6 weekly contracts listed for week 1, week 2 and week 4 and 13 weekly contracts listed for week 3	6 weekly contracts listed for week 1, week 2 and week 4; 12 consecutive weekly contracts, 4 additional quarterly contracts (Mar, Jun, Sep, Dec), and 3 additional Dec contracts listed for week 3

 

Changes to Strike Price Listings for European-style E-mini S&P 500 Options
PRODUCT	MDP 3.0: TAG 6937-ASSET	ILINK: TAG 55-SYMBOL MDP 3.0 TAG 1151 - SECURITY GROUP	CURRENT	NEW
E-mini Standard & Poor’s 500 Monday Weekly Options -  Week  1‑5	E1A-E5A	EW	Strikes listed for 40% above the at-the-money strike and 80% below the at-the-money strike at 100 index point increment plus dynamic strikes at 5 index point increment. When less than 366 days remain until expiration (DTE), additional strikes listed for 20% above the at-the-money strike and 40% below the at-the-money strike at 50 index point increment. When less than 96 days remain until expiration (DTE), additional strikes listed for 10% above the at-the-money strike and 20% below the at-the-money strike at 25 index point increment. When less than 66 days remain until expiration (DTE), additional strikes listed for 7% above the at-the-money strike and 14% below the at-the-money strike at 10 index point increment. When less than 10 days remain until expiration (DTE), additional strikes listed for 5% above the at-the-money strike and 10% below the at-the-money strike at 5 index point increment. For EW3, persistent strikes of 100, 1100, 2100, 3100, 4100, 5100, 6100, 7100, 8100, and 9100	Strikes listed for 40% above the at-the-money strike and 80% below the at-the-money strike at 100 index point increment.  Dynamic strikes at 5 index point increment. When less than 366 days remain until expiration (DTE), additional strikes listed for 20% above the at-the-money strike and 40% below the at-the-money strike at 50 index point increment. When less than 96 days remain until expiration (DTE), additional strikes listed for 10% above the at-the-money strike and 20% below the at-the-money strike at 25 index point increment plus persistent 100 and 2100 strikes. When less than 66 days remain until expiration (DTE), additional strikes listed for 7% above the at-the-money strike and 14% below the at-the-money strike at 10 index point increment. When less than 10 days remain until expiration (DTE), additional strikes listed for 5% above the at-the-money strike and 10% below the at-the-money strike at 5 index point increment.
E-mini Standard & Poor’s 500 Tuesday Weekly Options -  Week 1‑5	E1B-E5B	EW
E-mini Standard & Poor’s 500 Wednesday Weekly Options - Week 1‑5	E1C-E5C	EW
E-mini Standard & Poor’s 500 Thursday Weekly Options - Week 1‑5	E1D-E5D	EW
E-mini Standard & Poor’s 500 Weekly Options - Week 1‑4	EW1-EW4	EW
E-mini Standard & Poor’s 500 EOM Options	EW	EW

These changes are currently available for customer testing in New Release.

These contracts are listed with, and subject to, the rules and regulations of CME.

Listing Cycle Expansion for Aluminium European Premium Duty-Unpaid and Duty-Paid (Metal Bulletin) Futures  - September 10

Effective Sunday, September 10 (trade date Monday, September 11), the listing cycle for the following Aluminium European Premium Duty-Unpaid and Duty-Paid (Metal Bulletin) futures will be expanded on CME Globex.

Trade Marker at Close (TMAC) products allow market participants to enter a trade at a differential to the yet-to-be-determined daily marker price, for subsequent clearing into the existing products. TMAC functionality uses “0” to represent the yet-to-be-determined daily marker price and trades ± 20 ticks for E-mini S&P 500, Nasdaq-100, and Russell 2000 futures, and ±4 ticks for E-mini Dow Jones Industrial Average futures.

Listing Cycle Expansion for Aluminium European Premium Duty-Unpaid and Duty-Paid (Metal Bulletin) Futures
Product	MDP 3.0: tag 6937-Asset	iLink: tag 55-Symbol MDP 3.0 tag 1151 - Security Group	Current Listing Schedule	New Listing Schedule
Aluminium European Premium Duty-Unpaid (Metal Bulletin) Futures	AEP	ST	Monthly contracts for the current year and the next 2 years	Monthly contracts for the current year and the next 3 years
Aluminium European Premium Duty-Paid (Metal Bulletin) Futures	EDP	ST	Monthly contracts for the current year and the next 2 years	Monthly contracts for the current year and the next 3 years

These futures will be available for customer testing in New Release on Monday, August 14.

These contracts are listed with, and subject to, the rules and regulations of COMEX.

UpdateResting Order Elimination: Changes to Options on E-mini Standard and Poor's 500 Stock Price Index Futures - October 1

† Denotes update to the article

Effective Sunday, October 1 (trade date Monday, October 2), pending completion of all regulatory review periods, the following changes will be made for options on E-mini Standard and Poor's 500 Stock Price Index futures:

• The reduced tick threshold for all options on E-mini S&P 500 futures will be amended to 10.00 points from the current value of 5.00 points.
• The Variable Tick Table (VTT) value for options on E-mini S&P 500 futures will be changed to 15 from the current value of 4.

Please Note: To facilitate this change, customers will be asked to cancel all User Defined Spreads (UDS), Good ‘Till Cancel (GTC) and Good ‘Till Date (GTD) orders for related contracts by the close on Friday, September 29. After 4 p.m. CT on Friday, September 29, any remaining GT orders on these markets will be removed by the CME Globex Command Center (GCC) and UDS eliminated.
†Outright orders for options on E-mini S&P 500 futures will not be cancelled.

Resting Order Elimination: Changes to Options on E-mini Standard and Poor's 500 Stock Price Index Futures
Product	MDP 3.0: tag 6937-Asset	iLink: tag 55-Symbol MDP 3.0 tag 1151 - Security Group	Current Variable Tick Table Index Code and Globex Price	New Variable Tick Table Index Code and Globex Price
Options on E-mini Standard and Poor's 500 Stock Price Index Futures	ES	EW	VTT: 4 P < -500 = 25 -500 < P < 500 = 5 P > 500 = 25	VTT: 15 P < -1000 = 25 -1000 < P < 1000 = 5 P > 1000 = 25 Note: CME ClearPort tick will remain unchanged
Monday Weekly Options on E-mini Standard and Poor's 500 Stock Price Index Futures - Week 1-5 (European-Style)	E1A-E5A	EW
Tuesday Weekly Options on E-mini Standard and Poor's 500 Stock Price Index Futures - Week 1-5 (European-Style)	E1B-E5B	EW
Wednesday Weekly Options on E-mini Standard and Poor's 500 Stock Price Index Futures - Week 1-5 (European-Style)	E1C-ECB	EW
Thursday Weekly Options on E-mini Standard and Poor's 500 Stock Price Index Futures - Week 1-5 (European-Style)	E1D-E5D	EW
Weekly Options on E-mini Standard and Poor's 500 Stock Price Index Futures - Week 1-4 (European-Style)	EW1-EW4	EW
Options on E-mini Standard and Poor's 500 Stock Price Index Futures - End-of-Month (European-Style)	EW	EW
Options on Micro E-mini Standard and Poors 500 Stock Price Index Futures	MES	EO
Monday Weekly Options on Micro E-mini S&P 500 Index Futures - Week 1-5 (European-Style)	X1A-X5A	EO
Tuesday Weekly Options on Micro E-mini S&P 500 Index Futures - Week 1-5 (European-Style)	X1B-X5B	EO
Wednesday Weekly Options on Micro E-mini S&P 500 Index Futures - Week 1-5 (European-Style)	X1C-X5C	EO
Thursday Weekly Options on Micro E-mini S&P 500 Index Futures - Week 1-5 (European-Style)	X1D-X5D	EO
Weekly Options on Micro E-mini Standard and Poors 500 Stock Price Index Futures - Week 1-4	EX1-EX4	EO
Micro E-mini Standard and Poors 500 Stock Price EOM Options	EX	EO

The VTT values are defined in the instrument’s Security Definition Message (tag 35-MsgType=d) in tag 6350-TickRule tick table value as described on the Client System Wiki.

These changes will be available for customer testing in New Release on Monday, September 11.

These contracts are listed with, and subject to, the rules and regulations of CME.

Events and Announcements

Now Available: CME Reference Data API Version 3

Clients now have access to CME Group's newest version of CME Reference Data API, named CME Reference Data API version 3 (RD APIv3), hosted on Google Cloud (GC).

Clients should review the Client Impact Assessment for timelines and details of these changes.

• Beginning on Saturday, September 30, RD APIv2 will be deprecated and no further enhancements will be made.
• RD APIv2 will be decommissioned on Friday, October 27, and no longer supported.

CME Group recommends customers should migrate to CME RD APIv3 as soon as possible.

These changes are currently available in Production and for customer testing in New Release.

SPAN 2 Approximation Files Available Now - September 8

As previously announced, the SPAN 2 framework will be rolled out for specific product groupings in a phased multi-year approach after extensive testing, starting with major NYMEX energy futures and options on futures. 

SPAN 2 Approximation Files will go live over three weekends:

• August 11
• August 25
• September 8

All customers are encouraged to adopt the Approximation Files by Friday, September 8.

To help clients prepare for this launch, CME Group is offering the following services:

• Tools for replicating SPAN 2 margin requirements through software and API solutions for post-trade processes.
• New SPAN 2 approximation file to help firms estimate SPAN 2 margins in low latency margin calculation scenarios for pre-trade margin approximation processes.

Please contact PostTradeServices@cmegroup.com now to get ready for this critical migration.