RE: RE:RE: Be Careful What You Wish For29 Jun 2022 12:48
"FG, thanks for confirming and looking at several other trades in the same bid/offer price range seem to printed incorrectly?"
They aren't strictly incorrect because the underlying time-series data from the Exchange has no notion of "buy" or "sell" at all. In fact, it doesn't even include bid and ask prices at the time. Because investors like to see it, the various sites that display it make it up, by tracking bid and ask comparing the price with the prevailing price or the mid-point between bid and ask. If it's below that price it's marked as "sell"; if above, "buy"; if equal (on lse.co.uk) as "unknown". It's completely wrong for trades in the book on SETS (A trades) because those inherently are strict trades: the Exchange automatically matched an order on the bid with one on the ask, so it was a sell by one into a buy of another. Delayed trades make the buy/sell heuristic even worse, because the prices when it appears aren't relevant. For the 40m I went back to look at the prices at the time the order was placed, which is why I thought they were both likely to be buys, being just below the ask but somewhat above the bid at the time (and a large sell would have been priced much lower below the ask at the time, closer to the bid). It's a black art.