mid price9 Jan 2019 10:44
queried with the London stock exchange why the "high" price is so often not equal to that seen in trades, got an essay back but perhaps it explains why the "buy - sell" tab is so indecipherable on occasion.
"The 88 Energy Limited (TIDM : 88E) is trading under the ASQ1 trading segment. So as per the below rule which we have agreed with our business, we have to consider the Mid values for this segment.
Rule:
For instruments with segment different from ("SET0", "SET1", "SET2", "SET3", "STMM", "SSMM", "AMSM", "SSMU", "ETFS", "ETF2", "ETFU", "ETCS", "ETC2", "ETCU", "IECF", "EUE2")
o The “Mid Price” ((bid + offer)/2) is the summary price and high, low, net change and % change are based on it.
Therefore, the below tags/labels (in the summary table) are considered for 88 Energy Limited as it is coming under ASQ1 segment.
Mid Price is calculated as the average of the values of the on-book BBO as Bid + Offer / 2. Considering only on book order/quote.
Mid High is an intraday data and represent the maximum value of the Mid Price(Considering only on-book order/quotes).
Mid Low is an intraday data and represent the minimum value of the Mid Price (Considering only on-book order/quotes).
Bid Best buy Price. Considering only on-book order/quotes.
Offer Best offer price. Considering only on-book order/quotes.
If Mid Price, Mid High, Mid Low, Bid and Offer tags/labels are filled with values, this means that an order or quote has been published even if no trades (coming from on-book or off-book orders) have been executed yet, as occurred in the past days for 88 Energy Limited (only had off-book trades but there were on-book orders or quotes).
Please note that, on-book orders or quotes will not be displayed as trades under the Trades Table. This is why you cannot see the High Price (Mid-High) has not been traded for the day."
I will add to wiki 88 "The Markets" page.