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HOMEPERIODIC AUCTIONS BOOK
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* Periodic Auctions Book
Periodic Auctions Book
PERIODIC AUCTIONS BOOK
LIT BOOK DEDICATED TO INTRA-DAY AUCTIONS
The Periodic Auctions book provides a reliable place to execute orders within
the Cboe EBBO (in most cases calculated using Cboe’s BXE and CXE order books,
the primary market and Turquoise) on BXE and within the Cboe EBBO plus 1 tick on
DXE. This lit order book is characterised by a true price formation mechanism
and execution allocation that prioritises larger orders.
Cboe’s Periodic Auctions book is a MiFID II compliant lit order book providing
pre-trade transparency, as stipulated by MiFID II in accordance with RTS 1, by
publishing price and indicative execution quantity of the order book prior to
executing orders.
Visit the Periodic Auctions Book Resource page here.
HOW IT WORKS
ORDER TYPE
What orders are accepted?
* Limit Order
* Market Order
* Mid-EBBO Pegged Order
Can different order types match?
* All order types can match against any other order type
* Buy and sell orders are submitted individually and separately. There is no
ability to submit a pair of orders.
CALL PHASE
When does the call phase start and end?
* It commences upon receipt of the first order and continues as other orders
are entered into the book
* It ends randomly within a maximum defined duration
* The maximum duration of an auction is 100ms
What steps are taken to ensure orderly markets?
* Auction call durations are randomised
* There is no known minimum duration to deter those looking for liquidity
information without risk of execution
PRE-TRADE TRANSPARENCY
What is shown on the market data feed?
* During the Call Phase, indicative uncrossing size and price messages
* Follows RTS 1 for pre-trade transparency for periodic auctions
* The trades are published immediately post-auction match
How often is a message published to the market data feed?
* Size and price messages are published in real time
TRUE PRICE FORMATION
When does the price formation process occur?
* It begins immediately when the call phase ends and occurs every time there is
an order book event
Which orders does it apply to?
* All orders in the order book contribute to the industry standard price
formation process
How does the price formation process work?
* The match price is chosen using a four step tie-breaker process. The price
does not default to mid-point reference.
* Orders can trade at any price up to their limit price
* The price is checked to be within the EBBO collar to maintain orderly markets
(and within the Cboe EBBO plus 1 tick on DXE)
What are the criteria and the sequence?
1. Maximum executable volume
2. Minimum surplus
3. Market pressure
4. Reference price
For more details on each step, please read our Guidance Note.
ALLOCATION
How are orders allocated?
* Order allocation uses Broker Preferenced (where selected), price, size and
time priority in that order
* Residual from Broker Preferenced orders is reprioritised based on their
residual volume
* The Broker Preferenced feature is optional and refers to single broker paired
transactions
IT'S AS EASY AS A FIX TAG TO PARTICIPATE
Existing Participants connected to BXE and DXE can enter orders into the book by
simply using FIX tag 9303=BP. Participants can leverage the same clearing
arrangements, connectivity and FIX or BOE ports for order entry for the Periodic
Auctions book.
METRICS BEHIND MATCHES
We provide transparency into the data behind our Periodic Auctions book by
posting statistics for broker priority allocations. The following table shows
the Cboe Europe Equities percentage of broker priority allocations.
Cboe NL Cboe UK 2019 N/A 22.5% 2020 N/A 18.7% 2021 18.5% 18% 2022 17.7% 15.4%
2023 Q1 12.9% 11.3%
MINIMUM ACCEPTABLE QUANTITY
This video describes the feature of Minimum Acceptable Quantity (MAQ) that
controls the minimum total execution of each order.
Your browser does not support this video. Please update your browser.
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