Latest Updates | CATNMSPLAN

06/10/2026
Technical Specifications
2026 Industry Member Releases (Transaction) - Scope and Schedule
06/09/2026
FAQ| C. Definitions
C1. How has the Operating Committee defined “Trading Day”?
06/09/2026
Technical Specifications
CAT Reporting Technical Specifications for Plan Participants v4.3.0
06/02/2026
Event
Reference Database Industry Webinar (June 2, 2026)
06/01/2026
FAQ| D. Order Receipt
D10. How should orders received with instructions from the customer to buy as much stock as possible for a specific dollar amount (e.g., $1,000), commonly referred to as "cash" orders, be reported to CAT?
05/28/2026
Reference Material
Annual Clock Synchronization Certification Form
05/28/2026
Reference Material
Self-Reporting Deviations Of Clock Synchronization Standards Form
05/13/2026
Reference Material
Industry Member Schema v4.2.0
05/11/2026
Technical Specifications
CAT Technical Specifications for Billing Trade Details v1.3 (Redlined)
05/11/2026
Reference Material
May 11, 2026 – SEC Approved CAT NMS Plan as of 5/11/2026
05/11/2026
Technical Specifications
Order Routing Field Mapping between CAT and Exchanges v2.18
05/08/2026
FAQ| V. CAT Billing
V32. Can Prospective CAT Fees or Historical CAT Assessments be billed after March 31, 2028?
05/08/2026
FAQ| M. Firm Designated ID
M12. Where can I find additional information regarding the Firm Designated Identifier (FDID)?
05/08/2026
Reference Material
Billing Trade Details Schema - Off-Exchange
05/08/2026
Technical Specifications
Reference Database Technical Specifications v2.4.0 (Clean)

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A. General
B. Reporting Requirements
C. Definitions
D. Order Receipt
E. Order Routing and Execution
F. Representative Orders
G. Manual Orders
H. ATS
I. Foreign Securities
J. OTC Equity Securities
K. Options
L. Equity Floor Brokers
M. Firm Designated ID
N. Third Party Reporting
O. Technical Requirements
P. Feedback and Error Correction
Q. Customer and Account Information
R. Clock Synchronization
S. Security
T. Production Readiness Testing
U. Allocations
V. CAT Billing
W. Fee Dispute Resolution
X. Reference Database
All Topics

A. General
B. Reporting Requirements
C. Definitions
D. Order Receipt
E. Order Routing and Execution
F. Representative Orders
G. Manual Orders
H. ATS
I. Foreign Securities
J. OTC Equity Securities
K. Options
L. Equity Floor Brokers
M. Firm Designated ID
N. Third Party Reporting
O. Technical Requirements
P. Feedback and Error Correction
Q. Customer and Account Information
R. Clock Synchronization
S. Security
T. Production Readiness Testing
U. Allocations
V. CAT Billing
W. Fee Dispute Resolution
X. Reference Database
All Topics