SINGAPORE — Singapore’s stock market is enjoying a remarkable run in 2026, with the Straits Times Index (STI) repeatedly reaching new highs. But beneath the headline numbers lies a more complicated picture: much of the rally is being driven by just three companies — DBS, OCBC and UOB.
According to SGX data cited by CNA as of Aug 17, the STI had generated a 24 per cent total return year-to-date, ahead of the broader Asia-Pacific market at 19.4 per cent and global equities at 13.8 per cent.
For investors looking at the STI alone, the numbers appear to tell a simple story: Singapore equities are booming.
But the composition of the index tells a different story.
Three banks dominate the STI
The STI tracks the 30 largest companies listed on the Singapore Exchange and is weighted by market capitalisation, meaning larger companies have a greater influence on the index’s movements.
That makes Singapore’s three major banks particularly important.
DBS, OCBC and UOB together account for about 57 per cent of the STI’s weight, according to the CNA commentary. In other words, movements in these three banking stocks can have an outsized impact on the performance of the entire benchmark.
And all three have delivered strong gains this year.
DBS has seen its market capitalisation move beyond S$200 billion, with its share price gaining more than a third this year. OCBC has risen by nearly 60 per cent, while UOB has gained about 17 per cent, according to figures cited by CNA on Aug 18.
The rally is not confined entirely to the banks. Singapore Exchange, ST Engineering, Wilmar International and Singapore Airlines have also contributed to the market’s advance.
But the banking sector remains the dominant force.
Why the bank rally matters
The strength of Singapore’s banks is not particularly surprising.
The lenders have benefited from solid earnings, their established positions in wealth management and regional banking, and Singapore’s reputation as a financial safe haven.
CNA also pointed to substantial fund inflows following geopolitical turmoil in the Middle East and elsewhere, which have helped support demand for Singapore assets.
Recent results and corporate announcements also underline the continued importance of the sector. DBS, for example, released its second-quarter 2026 results in August and announced an interim dividend of S$0.81 per share.
But there is a catch.
When so much of an index is concentrated in one sector, the benchmark becomes increasingly sensitive to the fortunes of that sector.
If bank earnings remain strong, the concentration can amplify gains.
If the outlook changes, the same concentration can amplify losses.
The STI may not reflect the entire Singapore stock market
This is the bigger issue for investors.
Singapore’s listed market extends far beyond the three major banks. The SGX is home to property companies, industrial groups, technology businesses, manufacturers, healthcare and biotechnology firms, REITs and other companies that do not carry anything close to the same weight in the STI.
That means a company outside the index could be performing exceptionally well without having a meaningful effect on the benchmark.
Conversely, weakness in the major banks could pull the STI lower even if many smaller companies are performing well.
This is why the headline number can sometimes be misleading.
A record STI does not necessarily mean every part of Singapore’s stock market is enjoying a record boom.
More money is following the benchmark
The concentration becomes even more significant as more investors use products designed to track the STI.
CNA reported that assets under management in STI exchange-traded funds exceeded S$5 billion in June, with net inflows continuing for a 15th consecutive month. Because benchmark-tracking funds generally allocate according to the index’s composition, the three banks naturally receive a substantial portion of that capital.
This creates an important feedback loop.
The more money that tracks the index, the more important the index’s biggest constituents become.
And the more important those constituents become, the less representative the benchmark may be of the wider market.
Singapore wants to broaden its equity market
This concentration issue comes at a time when Singapore is actively trying to revive its stock market and attract more investor participation.
The Monetary Authority of Singapore launched its Equity Market Development Programme with S$5 billion in 2025 and expanded it to S$6.5 billion in 2026, with the broader objective of improving market participation and encouraging new listings.
The challenge is that attracting capital into Singapore is only part of the equation.
The money also needs to spread beyond the familiar blue-chip names.
A deeper market would give investors more meaningful exposure to Singapore’s wider corporate economy rather than concentrating so heavily on a handful of large companies.
The question investors should be asking now
The STI’s record run is undeniably a positive development for Singapore.
After years of criticism over weak market performance and limited investor interest, the revival shows that Singapore equities can still attract substantial global capital.
But the next test is more important.
Can the rally broaden?
Can more mid-cap companies attract sustained liquidity? Can the IPO market maintain momentum? Can Singapore develop a benchmark that better captures the performance of companies outside the traditional blue-chip universe?
Those questions could determine whether the current rally becomes a lasting revival or remains heavily dependent on a small group of market giants.
For investors, the lesson is straightforward: don’t confuse a rising STI with a uniformly rising Singapore stock market.
The index is strong. The banks are strong.
But the real test of Singapore’s market revival may be what happens beyond DBS, OCBC and UOB.
And that is where the next chapter of Singapore’s stock-market story could get much more interesting.
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