Open market repurchases (OMRs)-by far the most common form of share repurchases-have consistently increased and reached record levels towards the end of 2010s in the US in almost four decades since the adoption of the safe harbor rule. This dramatic increase has been largely attributed to various purported benefits of OMRs within the Anglo-American economic and corporate model. However these benefits fail to fully explain such increase. This failure suggests that illegitimate purposes might have also contributed to the increase in the number of OMRs and resulted in their excessive use. This suggestion is supported by the ineffectiveness of the rules applicable to OMRs in the US. On the other hand any and all share repurchases used to be strictly regulated in the EU. However some EU Member States and later the EU itself relaxed their relevant legislation and hereat adopted a safe harbor rule on OMRs that is essentially similar to that in the US. While this substantial legal convergence has also been followed by an increase in the number of OMRs in the EU the number of OMRs in the EU has been much lower than in the US. The less frequent use of OMRs supports the claim that EU corporations substantially persist in the Continental European economic and corporate model. Such persistence has also been partly reflected on the OMR regulation in the EU that prescribes a less ineffective framework than that in the US through a few but crucial regulatory technical differences. Hence this book compares and contrasts economic and corporate settings in the US and the EU and in particular rules and practices relating to OMRs on both sides of the Atlantic. The end result of this academic research is a series of regulatory proposals to maintain the purported benefits while curbing the number and eliminating the potential drawbacks arising from the abuse of OMRs primarily in the US and also in the EU and elsewhere including Turkiye that closely follow the EU acquis.