INTM333170 | Double Taxation applications and claims: Vouchers: What a block holding is
From HM Revenue & Customs · International Manual
A UK or overseas bank or finance house may hold a particular security on behalf of a number of their customers. All the individual holdings are amalgamated and registered as a single holding in a nominee name. This is a block holding. Each participating customer is entitled to his/her share of income arising from that block holding.