What happens depends on when the buyout offer hits. IMO if you have a buyout offer premarket you can pull your shares off before the open. Your shares (@ $4.90) below the buyout price would probably disappear before a halt could stop the trading during market hours. After an agreement to buy has been reached you can sell anytime @ 97-99% of the offer price (appx) or hold up until the deal closes for the full price. If you hold it's because you think there's a possibility of more bidders. Waiting to see if any other interested parties outbid the company making the announced buyout offer is OK if you can take the profit into the next tax year, or you don't care about money being tied up for a few months. Usually if you offer to tender your shares in a structured deal you can request to cancel your tender and get your shares back if bids come in higher than the price you tendered at. Also remember offers can be rescinded, so selling at or near a tender offer price is what many investors do, IMO. GL.