That's not entirely true. Everyone's shares are locked up and then released broker by broker but there is nothing to stop the company from selling shares in that time and a share collapse does sometimes happen for a while as everything settles down.
Typical scenario: - AS has shares available as soon as RS complete. Dilution machines kicks in straight away causing a crash. Broker #1 now releases shares. Panic selling ensues and people sell. This pattern can continue for a few days and shorts take advantage.
An RS is never clean without a drop unless it is for a solid reason with lots of PR before and during. I learnt to not hold during an RS a long time ago and I wouldn't recommend anyone to do it.
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