RE: Not sells2 Nov 2023 21:43
@SpadesAspade, the trade reporting rules allow for delayed reporting of certain trades, because the existence of a delayed reporting framework is of benefit* to market participants.
How does this framework operate? The Exchange publishes data on the average daily traded volume (ADT) for each individual listed security. In GGP’s case that is somewhere around the 10m mark, which puts it in the second of four bands. Trades in this band meeting the parameters below can be flagged for delayed reporting:
>5% ADT, 60 mins delay
>15% ADT, 180 mins delay
>25% ADT, end of trading day
>50% ADT, end of next trading day
>100% ADT, end of second next trading day
>250% ADT, end of third next trading day
Not all orders are placed online and filled “at market” by the market makers. The screen prices discussed endlessly here are ONLY the prices at which online orders routed to RSP’s might be filled. Other prices may be available for larger shapes or even just different routings. There are often different prices available for telephone trades, for example. Or for limit orders, especially in size. Looking at the screen prices and the trades reported on sites like LSE/ADVFN is like peering into a house through a narrow letterbox - you only have a restricted view, there are many rooms you can’t see. As a result you can’t use the L2 and live trade report data on sites like this to form a rounded picture of market depth and price formation. It is naive to describe everything not immediately visible through your letterbox as “manipulation”.
*Numerous academic studies have demonstrated that carefully controlled delayed trade reporting is beneficial for market participants - principally because it makes it easier to trade shapes in size. Here’s a recent example,
https://onlinelibrary.wiley.com/doi/full/10.1002/fut.22334 , the conclusion of which is “…while reporting delays increase the time taken to release information to the market by the length of the reporting delay, thereby prima facie reducing information efficiency, such delays encourage informed trading and potentially increase the informativeness of trading and, therefore, information efficiency.”