The banking industries of South-East European (SEE hereafter) countries are the main channel through which financial resources are distributed across the region and over the last decades they have witnessed deep structural changes such as privatisations, consolidation and cross-border acquisitions. The purpose of this study is to shed further light on how concentration, competition and the financial stability of these banking industries has changed over time. In addition, this study investigates how concentration and competition in the SEE banking industries affects the financial stability of SEE banks. By using alternative measures of market concentration and competition, I find a reduction in the degree of concentration as well as market structures characterised by monopolistic competition. Furthermore, using several measures of financial stability I find a reduction of non-performing loans as well as a reduction in the probability of insolvency of SEE banks. When analysing the effects of either concentration or competition measures on the financial stability of SEE banks, this study reveals that an increase in market concentration results in a reduction of the non-performing loans ratios, therefore indicating greater financial stability of SEE banks. On the other hand, by using the Lerner index as a measure of competition, the findings presented in this study reveal that an increase in banks’ market power has the effect of increasing non-performing loans ratios of SEE banks. Finally, by breaking down SEE banks in accordance with their ownership (i.e. domestic versus foreign ownership) and size (large versus small banks), this study reveals mixed results in relation to the effect of both concentration and competition measures on the financial stability of SEE banks.

东南欧（以下简称 SEE）国家的银行业是该地区金融资源分配的主要渠道，在过去几十年中，它们见证了私有化、整合和跨境收购等深刻的结构性变化。本研究的目的是进一步阐明这些银行业的集中度、竞争和金融稳定性如何随时间变化。此外，本研究调查了 SEE 银行业的集中度和竞争如何影响 SEE 银行的金融稳定性。通过使用市场集中度和竞争的替代措施，我发现集中度以及以垄断竞争为特征的市场结构都在下降。此外，使用金融稳定性的几种衡量标准，我发现不良贷款减少以及 SEE 银行破产的可能性降低。在分析集中度或竞争措施对东南欧银行金融稳定性的影响时，本研究表明，市场集中度的提高导致不良贷款率的降低，因此表明东南欧银行的金融稳定性更高。另一方面，通过使用勒纳指数作为竞争的衡量标准，本研究中的研究结果表明，银行市场支配力的增加具有提高 SEE 银行不良贷款率的效果。最后，通过根据所有权（即国内与国外所有权）和规模（大型与小型银行）对 SEE 银行进行细分，