I have written previously about the FCA website and the file that you can download from there which details the short interests in UK stocks disclosed by fund managers. However I stumbled across a useful looking site recently which aggregates the data and presents new or changed positions each day. It also allows you search for a particular company that you might be interested in, as well as links for all shorts listed by Company or Manager. It is called Shorttracker.co.uk which is a site run by Castellain Capital a fund management outfit I had never heard of - probably because they were only founded in 2009. You can also follow it on Twitter @UKShortTracker if you are one of the Twitterati.
The home page gives the Top 5 most shorted stocks and the most visited stocks that day. Interestingly after my post yesterday I note that Sainsbury's comes in at number 4 with a 7.3% short interest. However while this is interesting you shouldn't perhaps read too much into it as W.H.Smith is the most shorted stock with 10.9% outstanding and I believe it has been for some time. Nevertheless the shares have continued to perform well on the back of good results from managing a declining high street business while growing the travel business. But who knows maybe the shorts will be right eventually?
So any way don't get too spooked if one of your stocks is on the list as sometimes there may be genuine reasons that the institution concerned has to hedge their position with a short, but sometimes it will be genuine hedge funds or short operators attacking what they perceive to be a vulnerable business or overvalued share. So you need to look at the funds involved and judge each one on its own merits and decide if it puts you off or not.
A point to note is that they don't track positions when they go below 0.5% although they state it is possible that the manager concerned might still have a position. On the whole a useful way to keep abreast of new short positions and for checking on existing outstanding positions. I hope you might find it useful but I wouldn't recommend short selling personally (probably via spread betting or CFD's) unless you really know what you are doing as the losses can in theory be unlimited.