Problem: Investors are dependent on the issuers’ valuation of covered warrants because the issuers also act as market makers. Hence it is crucial that the issuers value each of the five variables used in the Black & Scholes pricing formula in the same way at both the buying and selling occasion. For a covered warrant investor the most important is-sue is the volatility and how it changes over time. This thesis will therefore search for differences in changes of implied volatility between the different issuers. Purpose: The purpose of this thesis is to analyze differences and similarities between the issuers’ changes of their covered warrants implied volatility. Method: The authors have calculated the implied volatility for a sample of warrants with H&M and Ericsson as underlying assets. Black & Scholes formula has been used and this part of the thesis is made with a quantitative approach. After the implied volatility had been calculated correlation tests to the mean as well as to the stock were made. When analyzing the results the authors, in addition to the calculation, used a qualitative method by interviewing market makers. This was made in order to find better explanations to the results. Conclusions: The differences in changes of implied volatility found between different warrants were small. In general, one warrant changed in the same way as the other ones from one day to another. These results reject the rumors that single issuers adjust their implied volatility in order to make more money. When single events in form of reports were analyzed, the authors found that the issuers changed their volatility in the same way to adjust for the changed uncertainty about the stocks future price. Further, these events clarifies that the basic dynamics of implied volatility is followed by the market. The analysis of how the implied volatility changes with respect to the stock price movements indicates a negative correlation. This implies that an increase in the stock price will lower the implied volatility and vice verse.

<p>Problem: Investors are dependent on the issuers’ valuation of covered warrants because the issuers also act as market makers. Hence it is crucial that the issuers value each of the five variables used in the Black & Scholes pricing formula in the same way at both the buying and selling occasion. For a covered warrant investor the most important is-sue is the volatility and how it changes over time. This thesis will therefore search for differences in changes of implied volatility between the different issuers.</p><p>Purpose: The purpose of this thesis is to analyze differences and similarities between the issuers’ changes of their covered warrants implied volatility.</p><p>Method: The authors have calculated the implied volatility for a sample of warrants with H&M and Ericsson as underlying assets. Black & Scholes formula has been used and this part of the thesis is made with a quantitative approach. After the implied volatility had been calculated correlation tests to the mean as well as to the stock were made. When analyzing the results the authors, in addition to the calculation, used a qualitative method by interviewing market makers. This was made in order to find better explanations to the results.</p><p>Conclusions: The differences in changes of implied volatility found between different warrants were small. In general, one warrant changed in the same way as the other ones from one day to another. These results reject the rumors that single issuers adjust their implied volatility in order to make more money. When single events in form of reports were analyzed, the authors found that the issuers changed their volatility in the same way to adjust for the changed uncertainty about the stocks future price. Further, these events clarifies that the basic dynamics of implied volatility is followed by the market. The analysis of how the implied volatility changes with respect to the stock price movements indicates a negative correlation. This implies that an increase in the stock price will lower the implied volatility and vice verse.</p>

台灣證券交易所每季會挑選並公告可為權證標的的股票，證券商再從中選取想要發行的股票標的，這些被選為標的的股票被發行權證的次數存在明顯的差異。證券商在發行時掌握了許多優勢，除了可以挑選標的之外，權證契約的內容大多也都由證券商決定，這些權證的契約內容勢必會依據標的股票特性的不同而有所差異。在本文中我們將找出會影響證券商選擇標的的因素。另外，我們也試圖找出權證契約與標的股票的特性的關聯性並且討論避險成本課稅問題解決後，對證券商發行權證的影響。 我們發現證券商偏好以近期受到較多市場關注、具有投資人市場偏好、有較高波動度以及有較好流動性的股票作為權證的標的。我們也發現不同標的特性的股票權證契約特性也會不同，受到市場較多關注、流動性較高的標的股票以及重設型、歐式的權證的溢價比例會較高，也發現標的股票的波動性越高，權證的存續期間會較低、標的股票的市值比例越高，權證的行使比例會越低、標的股票的波動性越高，證券商則傾向以重設型以及美式的形式發行權證。近幾年權證檔數的激增與避險成本課稅問題的解決也存在著緊密的關係。 最後，以避險成本課稅問題的時間點來觀察權證市場前後期的改變，則發現下列幾種現象的差異。第一、單一股票於一季之內被發行的次數增加，第二、權證的溢價比例上升，第三、權證的行使比例與存續期間下降，第四、單一權證的發行量降低。這些現象則顯示證券商發行權證模式的改變，在避險成本課稅問題解決後，證券商發行權證的模式類似於石油輸出國家組織控制石油供給量，透過降低每檔權證的發行量來增加議價的籌碼。 / Taiwan Stock Exchange (TWSE) selects and announces the stocks for issuing warrants quarterly. Brokers can pick up suitable underlying assets for issue warrants. We observed, however, that the frequency for underlying stocks for issuing warrants were different. We know that the broker has many advantages on issuing warrants likes selecting underlying stocks and setting covenants as well. The covenants will be set base on the stock’s characters. We tried to find key factors for brokers for issuing warrants. Besides, after the deregulation on hedge cost, we elaborate the relationship between warrants and underlying assets. We found brokers prefer to issue the warrant whose underlying asset with good liquidity, market frenzy and high volatility. Besides, we also noticed that the warrant’s characters will be different base on their underlying assets. The premium is higher for stocks with market frenzy, high liquidity and European warrant. Underlying assets with high volatility will attribute low duration. Stock with high market capitalization will make exercise ratio lower. Brokers intend to issue Reset and American warrants for underlying asset with high volatility. The surge of warrant issuing attributed to relax on hedging tax. Last, we showed the warrant market different after the relaxing restrictions of hedge cost as follows. First, the frequency of issuing warrant with same underlying asset increases. Secondly, the premium for issuing warrant rises. Thirdly, exercise ratio and duration declines. Fourthly, the volume for single issue is lower. These phenomenon shows that brokers try to increase their bargain power by controlling the warrant volume. This model likes Organization of Petroleum Exporting Countries (OPEC) to control the petrol price by depressing the supply.