A non-cash asset paid to the shareholders of a corporation that is being acquired or is the target of a merger. Theses securities generally consist of bonds, options, preferred stock and warrants, among others. Taobiz explains Merger Securities Merger securities can become undervalued when large investment firms are required to sell them as a result of their strict investment requirements. For example, a large mutual fund may receive stock options from an acquiring company when one of the companies held in its portfolio is purchased. If the fund has a policy against holding options, it may be required to sell them, which can then cause the price of the options to fall to very low levels.