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Comment dire 'locked-in shares' en français?

Veuillez trouvez ci-dessous le lien de la définition en anglais:
Lien: http://www.sharemarketbasics.com/Terms/Locked-In.php

Définition:Locked In Shares which cannot yet be sold because the condition of offer stipulates that the share be held by the allottee for a minimum period, usually three years. Locked in shares are often devalued by market cycles, i.e., when a bear cycle sets in, the profits disappear; but so dies the feeling of helplessness of the investor.

Merci par avance !