Through a demerger operation, a company transfers a part of its corporate structure to a beneficiary company, either an existing or newly-established one. The shareholders of the demerged company hand in the shares held and receive new shares of the demerged company as well as shares of the beneficiary company.
Let us assume, for example, that the company "A" has demerged in favour of the beneficiary "B" with an allocation ratio of 3 shares of the company "A" and shares of "B" every 5 shares of "A" held. Therefore, the shareholder of company "A", for every 5 shares handed in will receive 3 new shares of "A" and 2 shares of "B", the beneficiary.
Stock option (futures) contracts subject to demergers will only change the deliverable (lot), while the strike price (daily closing price) remains unchanged. In other words, what will be delivered (or collected) upon expiry will be a basket of securities, whose valuation is made considering the value of the entire basket.
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Example
Demerger of Seat Pagine Gialle in Seat Pagine Gialle and Telecom Italia Media, official notice n. 7968 of 1/08/2003
Description of the operation
Adjustment on stock options
Stock options on Seat Pagine Gialle ordinary shares with lot equal to 2,500 stocks will be adjusted in the following manner:
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