RE: My buy shows as a sell AGAIN8 Sep 2020 13:55
Well done. I don't think you are moaning like some do when that happens. Whoever, it happens to it just means you got a good price for your purchase as it was below the bid/ask midpoint. Surely that's a good thing.
It often happens when the ask moves up during you placing the trade and getting an offer. LSE have no way of knowing how the trade was initiated so they report blue for above mid, red for below and black when bang on the mid point. The bid and ask are not set the same for all MMs. If you get Level 2 you will be able to see the range of bids and asks where there are upper and lower spreads and the published spread is often the lowest of the bids to the highest of the asks. Not sure it's that useful.
The only good info I got from L2 was the volume quoted so if you went above that you got a negotiated trade so if you want to unload in a hurry like when a dilution hits in a 7am RNS and you want out before 8:05 you learn that 100,0000 means you can for example usually get an offer for 99,999 shares but not for 100,001, 100,000 on the nose is usually okay on the buy not so much on the sell. This is useful while learning the market but longer term you can have a good guess at what those volumes are going to be so I don't pay for L2 any more. I'd just go straight trading a slightly lower number than I think it will be and sometimes you can do the "catch a falling knife" If you are buying small amounts of say, under £10k, then you don't need to worry about it.