STI at 60: The index that grew with Singapore

Six decades ago, the Straits Times Index (STI) began tracking Singapore's most prominent companies, mirroring the nation's growth from a trading hub to a regional powerhouse. Despite being almost as old as Singapore itself, the STI remains closely intertwined with the country's daily life. From the banks where locals deposited their first paychecks to the telecommunications and airline companies that shaped the nation's travel and communication, these institutions have been instrumental in building Singapore's economy.

In 2026, the STI celebrates its diamond jubilee, marking not only a corporate milestone but also the intertwining of the index with Singapore's development. Established in 1966, the STI has evolved alongside the country's industrialization, expansion as a financial center, and growth as a regional business hub. Today, it comprises 30 of the largest and most liquid companies listed on the Singapore Exchange, with a focus on firms such as DBS Bank, OCBC Bank, UOB, Singtel, Singapore Airlines, ST Engineering, Keppel, and CapitaLand.

These familiar names are more than just companies; they are the pillars of Singapore's economy, financing businesses, connecting households, supporting travel, engineering infrastructure, and representing Singapore abroad. The STI's performance in 2025 delivered a total return of about 23 percent, surpassing both the S&P 500's return of around 18 percent and the Nasdaq Composite's gain of approximately 20 percent. It also crossed the 5,000 mark for the first time in February 2026, a milestone once thought distant.

Investors have shown renewed interest in the STI, with exchange-traded funds tracking it amassing about $5.4 billion in combined assets by July 2026. While traditionally associated with Singapore's banks, the STI now represents a broader range of industries, including infrastructure, advanced manufacturing, and digital infrastructure.

Companies like Singtel, Keppel, and ST Engineering have expanded into AI, data centers, and advanced manufacturing, reflecting Singapore's transformation from a traditional entrepot economy to a smarter, more sustainable, and connected economy.

As the STI approaches its 10,000 mark, analysts question whether such growth would signify deeper markets, broader participation, and continued economic value creation beyond Singapore's size. With its focus on digital infrastructure, sustainability, advanced manufacturing, regional finance, and cross-border capital flows, the STI is poised to adapt to Singapore's evolving economic landscape.