Hate to be that guy but these don't really mean much at all -...

Hate to be that guy but these don't really mean much at all - they're just the nominee holdings, not really "the big boys".... It's a mistake people make all the time

If you're unfamiliar with this, what it basically is, is that the holders do not directly own their shares but instead the broker (Citi, BNP Paribas etc) becomes the "registered" owner, acts as the custodian holding the investment (in this case xtc) on behalf of investors. There will be hundreds of individual investors holdings pooled here. That's why you will see there in the top 20 on pretty much any stock you look up