Can anyone explain why closing bid prices & mid vary so much against each other depending on where you look!

e.g. GSK Friday - streaming bid price closed @ 12.37

With after market closing dealing the MID(?) price ended up @ 12.05 and this also was the mid (?) price quoted in the newspapers over the weekend. This also seem to be the opening mid(?) price everywhere this morning.

So what is the real closing bid price? The closing mid(?) price or closing bid price?

I have access to the official closing prices and always value on the bid - I totally agree with you there.

I do note MAM and others show strange prices on occasions and suggest you take the last real bid shown before close and probably lowest bid for your purposes

Little woman. If it is a SETS stock then you may find some variance. For example, in the auction on close on Friday, DEB was sold down to 382p(therfore closing mid price) yet the bid and offer were still around 399p(thge last price before auction.. The vagaries of the auction system on SETS for you.

It used to be so much easier..............