Launched in 1989 and encompassing Singapore, the Malaysian state of Johor, and Batam Island in Indonesia, the SIJORI Growth Triangle sought to market these territories as a ‘single investment destination’ offering differing factor endowments in close proximity. Singapore was the ‘core’ of the region; Johor and Batam occupied the land, labour, and resource‐intensive ‘non‐core’ spaces. During the 1990s, investment flows into the three territories, particularly in the electrical and electronics (E&E) industry, mirrored this division of labour. Through scrutinising trends in E&E firm entries, nationality, and industry branch in Singapore, Johor, and Batam for the 1993–2012/14 period, this article sheds light on the recent evolution of the E&E sector in the Growth Triangle. We document an increasing disconnect between the three nodes that has substantially reduced SIJORI's significance as an integrated industrial cross‐border region.