UBS Switzerland AG's response (May 2016)
...Please note that UBS has reportable positions in a large number of companies worldwide in which it does not have any strategic interest. Often UBS holds these positions on behalf of clients. The diverse positions in a particular company are collated across business units and reported to the company once the total position has crossed (or fallen below) the applicable notification threshold. UBS does...not comment on specific or potential client relations or transactions or its investments in any particular company.