Open Radio Access Network (Open RAN) represents the next-generation architecture within the RAN market, primarily driven by telecom operators’ pursuit of independence from traditional equipment vendors and the increasing trend toward network infrastructure decoupling. At its core, Open RAN aims to establish an interoperable framework for network equipment. A significant challenge, however, is the telecom operators' growing dependence on system integrators (SIs) to manage the heightened complexity resulting from RAN technology decoupling. Additionally, vendor strategies remain fragmented, and the ecosystems being developed lack full interoperability. Substantial challenges must still be addressed to realize the vision of true openness in Open RAN. This report provides a comprehensive analysis of global Open RAN market development and explores the deployment strategies of emerging SIs, including NTT OREX SAI, Rakuten Symphony, and Mavenir.