This study examines how the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP) shaped the institutional risk environment for Singapore-sourced foreign direct investment (FDI) within Vietnam’s manufacturing and industrial ecosystem during 2019–2024. The study conceptualizes FDI as a long-horizon cross-border capital-allocation decision and examines three dimensions: investment scale, capital composition, and ecosystem formation. A qualitative explanatory case-study design combines process tracing of CPTPP Chapter 9 and Vietnam’s domestic investment reforms with official registered FDI data and corporate disclosures from Sembcorp Development, Mapletree Logistics Trust, and Ascendas/CapitaLand. The findings show that Singapore-sourced registered FDI increased from USD 4.50 billion in 2019 to USD 10.21 billion in 2024, representing a 126.9% increase between the endpoints. However, the annual trajectory was non-monotonic and materially influenced by large individual transactions. The analysis identifies investor protection, capital-transfer provisions, rules-based dispute settlement, and enhanced market access through regional production networks as principal channels through which the CPTPP may mitigate selected forms of institutional investment risk. Corporate cases further indicate an ecosystem mechanism whereby industrial parks, logistics facilities, and business parks mobilize cross-border capital into real assets, support manufacturing activities, and potentially strengthen project bankability. Nevertheless, aggregate source-economy statistics cannot establish the extent to which Singapore-sourced investment was allocated specifically to high-technology manufacturing, and no reviewed corporate disclosure directly attributes an investment to a specific CPTPP provision. The study concludes that the CPTPP functioned as a conditional institutional de-risking architecture that strengthened the enabling environment for Singapore-linked investment rather than an independent cause of FDI expansion.
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