RE: SP today13 Nov 2017 15:48
A very odd one to be sure. It looks lie it's been sliding all day. My guess is that one of the institutional holders has either decided to, or has been forced to reduce its holding, and the trade has not been executed well at all. As noted by Lindoser, volume is still only three-quarters of the daily average, which is surprising given the fall (which I would expect to attract quite a lot of buyers in.
Anyway, watch out for a holding RNS in the next few days. However, if anyone actually has any stock-specific news we've missed, please shout!