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How much will a stock be worth after a merger?
It depends.  If you accept the offer, then your stock will cease existing.  If you reject the offer, then you will become a minority shareholder.  Depending on the circumstances, you could be in the case where it becomes illegal to trade your shares.  That can happen if the firm ceases to be a public company.  In that case, you would discount the cash flows of future dividends to determine worth because there would be no market for it. If the firm remained public and also was listed for trading, then you could sell your shares although the terms and conditions in the market would depend on how the controlling firm managed the original firm.