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Expiring 401(k) Stock Option and Liquidation Implications
Is the parent company's common stock public?   If not, then there will be absolutely no pressure from everyone liquidating at the same time. If so, consider the average daily volume of transactions in the parent company's stock.  Is it much greater than the volume your 10k co-workers will have to liquidate?   If so, I wouldn't expect much of an impact from all liquidating at once. Any other situation, you are probably right to be a bit worried about simultaneous liquidation.   If this was my case, I'd probably submit a limit sell order so as to try and pick out a high for the timing of my liquidation, and lower my limit vs fair value as it got closer to the expiration of your ability to hold the parent company stock.