The contracts for share ownership can simply proscribe the conditions that trigger change of ownership for purposes of tenure. In such a case it would not matt

The contracts for share ownership can simply proscribe the conditions that trigger change of ownership for purposes of tenure. In such a case it would not matter if you sold the shares, gifted them, had them siezed, or offered them in a lottery -- change of ownership resets the tenure clock. In your example case, as soon as the shares were seized then for purposes of tenure they were sold by you to the Italian government to cover your debts.