Lock up period

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A lock up period is a predetermined amount of time following an initial public offering during which employees and close associates of the company who are given shares are not allowed to sell those shares. Generally, a lock in period is a condition of exercising an employee stock option.

A lock up period may also be referred to as a lock in, locked in, lock out, locked out, or locked up period. Any one of these variations may be hyphenated, such as "lock-up period", and variations with out or up may also be joined to form one word, such as "lockout period".