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If the effect of early employees and investors selling after the lockup is significant, it wouldn't manifest itself as a drop after the lock up, it's a known date and it would be anticipated ahead of time by other investors and traders with the stock price reflecting this.

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Fair point -- I should have been more clear, this analysis was based on comparing the post-lockup price to the first trade, and also to the primary offering price (not 180 days to 179 days). You'd sometimes see a drop from the "pop" price, although not always, and it would almost never fall below the primary price.

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