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This Thesis analyses the difference in the impact of the issuance of a green bond on the stock prices of the issuing entity by country, using an event study approach of 135 green bonds, by comparing the actual daily returns of the event window with the expected returns calculated from the estimation window. With only a slight influence of the country found, further factors effecting the impact are considered. While we conclude that German issuers tend to see a stronger impact than most issuers from other European countries, factors such as the risk of greenwashing, time of issuance, industry, and firm fundamentals appear to skew this impact so that it is not possible to make a definitive statement about the impact of the country of origin on the effectiveness of green bond issuances at providing excess stock returns.
The present thesis attempts to answer the question “What makes a bond green?” by analysing the current status of the green bond market with regards to its regulation and evaluating the need for harmonizing green bond standards.
A green bond, which is characterized by allocating its proceeds exclusively to climate-related or environmental projects, is a relatively novel sustainable financing instrument that has recorded exponential growth since the first issuance in 2007. The green bond market has developed as a privately regulated market leading to a range of different green bond standards and other market mechanisms used for verifying green bonds, of which some have developed into best practice followed by most issuers. This fragmented regulation and the lack of a globally accepted green bond standard leads to the difficulty in clearly identifying what makes a bond green.
By analysing the current best practice and comparing green bond standards this paper identifies the differences between existing standards and suggests the further harmonization of standards as an important prerequisite for the further growth of the green bond market. Consequently, the challenges related to the private nature of green bond regulation is reviewed, leading to the conclusion that the intervention of the government and establishment of public regulation for green bonds could be considered. With regards to the further expansion of the green bond market the EU Green Bond Standard that is currently under development by the European Commission is critically analysed.