NASDAQ OMX Nordic: Derivatives: Pro-Rata Allocation in OMXS30 Index Options (22/20)

This notice is to inform members that Nasdaq Derivatives Markets plans to
change the matching method for OMXS30 index options from current price/time
order priority, to a price/pro-rata allocation method. This functional change
is scheduled to be implemented in production during the month of September
2020. The new matching algorithm will be made available for member testing
during Q2 2020. 

Under the pro-rata allocation method, orders will be matched into trades
firstly based on the best available price in the order book and secondly in
case there are several orders at the same price, then at the given price level
the trade quantity will be allocated to resting orders on a pro-rata basis. All
types of orders at a given price including market maker quotes will at the time
of matching be considered for the trade allocation and receive fills in
proportion to their displayed order quantity. 

A detailed implementation timeline confirming the dates for go-live in
production and the availability in external test environments will be published
via exchange and IT notices late March or early April 2020. 

For further information, please see the attached file.

Attachment:
https://cns.omxgroup.com/cds/DisclosureAttachmentServlet?messageAttachmentId=757579