University of Tehran Press Interdisciplinary Journal of Management Studies 2981-0795 18 4 2025 09 04 The Combined Influence of Market Concentration and Shares on Banking Performance: Insights from Jordan 791 806 101691 10.22059/ijms.2025.383545.677089 EN Raghad Habaibeh Department of Accounting, Business School, University of Jordan, Amman, Jordan Mahmoud Alkhalaileh Department of Accounting, Business School, University of Jordan, Amman, Jordan Manar Al-Mohareb Department of Accounting, Business School, University of Jordan, Amman, Jordan 0000-0003-4983-5757 Journal Article 2024 10 10 This study investigates how market shares and concentration affect banks' performance on the Amman Stock Exchange. We employed regression analysis on a complete dataset from 2012 to 2022. We look at the Herfindahl-Hirschman Index (HHI) to analyse how market concentration and each bank's share affect their performance. The research findings indicated a positive relationship between market shares and banks’ performance, as well as a positive relationship between market concentration and banks’ performance. These results support the structure-conduct-performance (SCP) and relative market power (RMP) hypotheses. The findings have significant implications for policymakers, regulators, and banking practitioners aiming to enhance the banking sector's efficiency, competitiveness, and resilience in emerging markets. https://ijms.ut.ac.ir/article_101691_bb0dce758b52e253524c2c71736e04dc.pdf