Trading Status Message Fields

The Trading Status message is used to indicate the current trading status of a security on a Cboe exchange. A Trading Status message is sent whenever a security’s trading status changes. Sequenced Trading Status messages are sent upon system start up for all active securities with Trading Status = 'S' (suspended). Trading Status messages will continue to be published upon symbol state changes, such as at the beginning of order acceptance.

A Trading Status message will be sent:

• for Regulatory Halts in any security as well as the Trading resumption for the same security.
• for Cboe Listed securities that are in a Quoting period for auctions.
• to indicate a Reg SHO price test is in effect.

  Table 1. Trading Status

  Field	Offset	Length	Value/Type	Description
  Length	0	1	Binary	Length of this message including this field.
  Message Type	1	1	0xAB	Trading Status message
  Timestamp	2	8	Binary	Timestamp of the matching engine trading status message emitted by the specified Market Center. Encoded as the number of nanoseconds since midnight (effective 11/02/26, since epoch).
  Symbol	10	8	Alphanumeric	Symbol right padded with spaces.
  Market Center	18	1	Alphanumeric	Y=BYX Z=BZX A=EDGA X=EDGX
  Trading Status	19	1	Alphanumeric	A=Accepting Orders for Queuing H=Halted Q=Quote-Only S=Exchange Specific Suspension T=Trading
  Reg SHO Action	20	1	Alphanumeric	0=No price test in effect 1=Reg SHO price test restriction in effect
  Total Length = 21 bytes