Equity carveouts (ECOs) as an instrument of financing and reorganization have increased in popularity: In 1999/2000, more than 40% of German IPO volume is accounted for by equity carveouts. Prominent examples are the carveout of Infineon (Siemens) and of T-Online (Deutsche Telekom). However, activity has decreased since the boom year 2000, and in 2002 and 2003 not a single ECO has taken place. In 2004, the planned ECO of Hapag-Lloyd was cancelled, and Deutsche Telekom even bought back T-Online. Thus, in practice there is no clear verdict on ECOs as instruments of financing and reorganization. The academic literature has been occupied with the subject for 15 to 20 years, but with heterogeneous results: Some contributions lack stringent theoretical foundations, coupled with effective empirical analysis, others limit their scope to the short-term effect of ECOs. Consequently, the overall effect of ECOs on firm valuation still remains unclear. The present thesis by Lukas Junker attempts to answer exactly this question. It analyzes the effects of ECOs on firm valuation (holding company as well as subsidiary).