The Straits Times Index climbed 48.53 points, or 0.86%, to close at 5,723.76 on Tuesday, its largest single-day gain since September 4, trading between an intraday high of 5,737.33 and a low of 5,663.60. Advancers outpaced decliners 18 to 4, with eight constituents unchanged, as Seatrium, ST Engineering and SGX led gains that extended across most of the board, including all three local banks.

The index opened firmer by 0.17% on the back of an overnight rally on Wall Street, according to morning trading commentary, before the advance broadened through the session to close near its session high. The gains came as markets looked ahead to a busy week of data and events, including Singapore's August CPI print and euro-area flash PMIs due later this week, alongside a crowded geopolitical calendar and Costco's fiscal fourth-quarter earnings as the lone major US corporate test. With little in the way of fresh index-level catalysts locally, Tuesday's advance tracked broader regional risk appetite rather than any single domestic trigger.

Session Movers

Seatrium (5E2.SG, +4.88%) led the index higher, rising to $2.15 after the company established a new S$100 million share buyback programme, to be funded through open-market purchases and used for employee share schemes, director fees or cancellation. The plan draws on an authorisation approved at the company's April 2024 shareholder meeting to repurchase up to 2% of issued shares and is expected to take more than a year to complete. The stock trades at 0.94 times book — cheaper than 99.62% of the past year — against a consensus Buy rating and a $2.51 target implying 16.65% upside.

ST Engineering (S63.SG, +2.89%) advanced to $10.69, extending the move that followed Goldman Sachs' initiation of coverage last Thursday with a Buy rating and a $13.20 target, projecting a 20% net profit compound annual growth rate from 2025 to 2029. There was no fresh company disclosure Tuesday, and Goldman's optimism continues to sit in contrast with Morningstar's Hold rating. The stock now trades at 56.65 times earnings — cheaper than just 10.43% of the past five years — against a consensus Buy rating and an $11.66 target implying 9.03% upside.

SGX (S68.SG, +2.87%) rose to $22.96 with no company-specific announcement Tuesday. The most recent relevant disclosure remains last week's report that retail investors net bought S$888 million in Singapore stocks through September 16, with DBS, OCBC and SGX together accounting for two-thirds of that demand. SGX now trades at 34.15 times earnings — cheaper than just 4.45% of the past decade — against a consensus Hold rating and a $23.80 target implying 3.67% upside.

CICT (C38U.SG, -0.88%) was the session's lone selected decliner, slipping to $2.24 even as its manager reiterated first-half 2026 results in a slide presentation released Tuesday: portfolio value of S$30.9 billion, gross revenue up 7.5% year-on-year, net property income up 8.7% and distribution per unit up 7.1%. The disclosure largely restated figures already known from mid-September, and the stock's decline extended a pattern in which REIT-linked names have lagged bank- and industrial-led gains in recent sessions.

One point worth noting

Tuesday's 0.86% gain was the index's best single-day showing since September 4, and for once breadth matched the headline number cleanly: 18 of 30 constituents advanced against just four decliners, a more uniform rally than several recent sessions in which gains concentrated in a handful of large-cap names left the broader tape lagging behind. Underneath that alignment, though, two of the day's biggest movers were among the board's priciest names by their own history — ST Engineering at 56.65 times earnings and SGX at 34.15 times, both near multi-year valuation highs — a reminder that today's participation was broad, but its leadership was concentrated in stocks that were already trading rich.