RE: I see the A TRADES12 Jan 2019 18:20
Good evening, taufour. I’m not sure how familiar you are with the order book or a Level 2 screen, however, as is generally the case with such things, on this occasion I can assure you that there is no substance to the conspiracy theory. If you’ve not seen a L2 screen before, and if anything I should say seems a little obscure, perhaps you might find it helpful to view an example of a L2 screen by clicking ‘Live Data’ above and viewing the demo.
As you will probably know, the order book consists of two columns — the ‘bid’ and the ‘offer’ (or ‘ask’ if you prefer), and the price you see above (or anywhere else, for that matter) is simply the two with the tightest spread, and they top the columns (ranked secondarily to price by the time they were entered onto the book). The reason ‘A’ trades are always at the extreme of the spread is quite simply because they are ‘A’utomatically matched by the SETS system and not ‘quote’ driven. ‘O’ trades on the other hand are met by a M.M. or broker and in order to win business they will quote a competitive price within the spread. Your broker, be it HL, Barc, or another will then present you with the most favourable price that they have been offered - this is why (particularly when volumes are low) you will invariably see ‘O’ trades going through near the midpoint in the spread as the M.M.’s compete for business.
Notwithstanding the fact that there are various nefarious practices and Machiavellian tactics brokers or financial professionals can - and do - employ in order to stiff the retail side of this business, on this occasion that is not the case. On the contrary, because ‘A’ trades are met by LSE’s own SETS system there is a certain amount of integrity and transparency to them. Of course algorithms and HFT are ways ‘game’ the system, but, in their own own right and because they lack the sometimes dubious input of a middleman, there is nothing overly sinister about ‘A’ trades at all.
Hope this helps.
per ardua ad astra