COSCO and China Shipping Container Lines (CSCL) merged and reorganized as COSCO Shipping Lines in 2016. Through using a complex network methodology, we analyze the spatial patterns of their shipping networks before and after the merger. We evaluate the integration effects based on two main dimensions: network and hub economies. While complementarities are found between COSCO and CSCL networks before the merger, COSCO Shipping Lines increased the total number of service nodes and shipping routes significantly. The merger also had the effect of strengthening the hub capacity of 7 of the top 15 hub ports in the main markets covered by the new company. Results underline that this strategy of overseas pivotal ports promoted the development of hub economy and regional market expansion. 1878 | WANG et Al. 1 | INTRODUCTION In the liner shipping business, the performances of shipping firms rely on their conduct of taking such decisions as capacity and pricing level. From the mid-1990s onwards, a tendency toward mergers and acquisitions has spread quickly across shipping firms (Yip, Lun, & Lau, 2012). After the global financial crisis in 2008, the shipping market was generally oversupplied. Against the backdrop of performance losses and financial constraints faced by most shipping companies in 2016, the industry underwent a consolidation and reorganization. The ultimate objective was to solidify their competitive position against competitors (Yip et al., 2012). Typical examples of such mergers and reorganizations include the French company CMA-CGM merged among Neptune Orient Lines, the Norwegian Solstad Offshore, and REM Offshore; NYK (Nippon Yusen Kabushiki Kaisha) and MOL (Mitsui O.S.K. Lines) integrated with Kawasaki steam ship and its consignment business, STX marine shipbuilding's self-rescue reorganization plan; and Hapan-Lloyd, integrated with UASC (United Arab Shipping Company) and Maersk Line consolidated with Hamburg Süd Group. Following this trend, China merged and reorganized its major shipping giants, namely COSCO and CSCL, renamed as COSCO Shipping Lines. COSCO and CSCL were China's largest shipping companies in 2015 while ranked sixth and seventh in the world, respectively. From the March 1, 2016, COSCO Shipping Lines entered a transition process through the integration of shipping routes and the leasing of container ships formerly operated by CSCL. It also began to integrate the assets within the CSCL networks gradually according to its restructuring plan. COSCO Shipping Lines had formed a new shipping network structure by December 2016. Recently, merger and reorganization activity among shipping enterprises has surged. Some research studies (e.g., Drahokoupil, 2017; Onwuegbuchunam, Okeke, Igboanusi, & Ugboma, 2018; Yeong & Jung, 2017) have put forward different views on the merger of COSCO and CSCL. But, there have been few studies to review and analyze the development and formation of shipping networks (Lau, 2018). Some scholars have begun to study the impact of shipping alliances and restructuring activi...