My ice cream example was just to show the number of customers or share registries it offered was not relevant. It is whehter the company is seen as a single entity or a group of individuals.
Here is a definitive answer
Corporate entities: singular or plural? — Well Writ
The answer appears to be grey rather than black or white. But I will go with the style guidleine at the end which indicates Link 'is' a share registry is correct.
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