IPO Lock-up Period

An IPO lock-up period is a contractually fixed window after an initial public offering, commonly around 180 days though sometimes 90, during which company insiders, including founders, employees, directors and large pre-IPO shareholders, are barred from selling their shares. The restriction is disclosed in the offering prospectus and is designed to prevent a sudden flood of insider shares from overwhelming the market and depressing the new stock's price, balancing insiders' wish to cash out against the need for early price stability.

The mechanism is directly relevant to Reddit's March 2024 listing on the New York Stock Exchange under the ticker RDDT, priced at thirty-four dollars a share. Substantially all of the pre-IPO shares held by insiders and large holders were subject to a 180-day lock-up that expired in the latter part of 2024. A notable Reddit-specific wrinkle was that the shares sold to eligible users and moderators through its directed share program were exempt from the lock-up, so those buyers could sell from the first day of trading. Lock-up expirations matter because they sharply increase a stock's freely tradable supply and can pressure its price, making the calendar around them a closely watched event for newly public companies like Reddit.