Singapore Markets Weekly Brief: Week Ending September 18, 2026
Executive summary
Singapore equities ended the week lower. The Straits Times Index (STI) fell from 5,695.93 on September 11 to about 5,656 on September 18, a decline of approximately 0.70% week on week. The index was down 0.08% on September 18, after closing at 5,660.52 on September 17 following a 0.45% rebound. [4] [4]
The week was volatile rather than uniformly weak. The STI rose 0.39% on September 14, then fell 1.39% on September 15 to 5,638.64, slipped another 0.06% on September 16, rebounded 0.45% on September 17, and eased 0.08% on September 18. [6] [8] [4] [4]
The main external drivers were the interaction of Middle East oil-supply risk and US monetary policy. Earlier in the week, Brent was reported near $106 after attacks affecting shipping and Saudi oil infrastructure, while markets priced a high probability of a Federal Reserve hike. [9] By September 18, oil had fallen for a third straight day, with WTI at $100.70 and Brent at $100.70, while the Fed’s rate hike, lower oil prices, and easing Treasury yields helped risk sentiment recover. [10] [10]
Market performance and interpretation
| Indicator | Latest evidence | Weekly read-through |
|---|---|---|
| STI, Sep 11 close | 5,695.93 | Baseline for the trailing week [6] |
| STI, Sep 15 close | 5,638.64, -1.39% | Sharpest documented Singapore selloff of the week [8] |
| STI, Sep 17 close | 5,660.52, +0.45% | Partial rebound [4] |
| STI, Sep 18 | 5,656, -0.08% | Week ended soft [4] |
| STI Sep 11 to Sep 18 | Approximately -0.70% | Net weekly decline, calculated from the reported closes |
The pattern suggests that Singapore stocks absorbed a midweek risk-off shock but recovered only part of the loss. The strongest pressure point was September 15, consistent with the broader regional backdrop of higher oil prices, geopolitical tension, and rising rate expectations. The late-week rebound was more a stabilization signal than a decisive trend reversal because the STI still finished below the prior Friday close.
The available Singapore index data do not provide a complete September 18 sector breakdown. Therefore, it is safer to describe the week as a broad index-level pullback with a midweek selloff and partial recovery, rather than to assert that banks, REITs, or any other sector led without a verified sector table.
Key economic indicators
Singapore’s latest available non-oil domestic exports (NODX) data were strong: NODX expanded 46.2% year on year in August 2026, extending a revised 24.1% increase in July, with electronics continuing to surge. [5] This is an important positive signal for Singapore’s trade and technology-linked manufacturing exposure, although the figure is a monthly indicator and does not by itself establish the outlook for the whole economy.
The latest available annual inflation reading was 2.2% in July, up from 1.9% in June and the highest since August 2024. [7] That combination - strong electronics exports but firmer inflation - points to a mixed macro picture: external trade momentum was robust, while domestic and imported price pressures remained relevant for monetary-policy expectations.
The evidence gathered does not establish that a new Singapore CPI or GDP release occurred during September 14-18. The indicators above should therefore be read as the latest available macro backdrop, not as data released during every day of the trailing week. This distinction matters because market prices during the week were driven heavily by global oil, US rates, and geopolitical developments.
Rates, currency, and cross-asset trends
Singapore’s 10-year government bond yield was 2.45% on September 18, down 0.06 percentage points from the prior session. It was nevertheless 0.09 points higher over the month and 0.65 points higher year on year. [1] The daily decline fits the late-week easing in global yields, but the monthly and annual comparisons show that the broader rate environment remained materially tighter than earlier periods.
Available SGD/USD observations show the pair at 0.7910/0.7920 on September 9, 0.7910/0.7917 on September 10, 0.7887/0.7899 on September 11, and 0.7892 on September 13. [2] These observations point to a softer Singapore dollar against the US dollar across the available early-week data, though the source does not provide a September 18 closing rate, so a full-week SGD return should not be claimed.
Oil remained the key macro cross-asset risk. The early-week oil spike threatened to reinforce inflation and rate pressure, while the late-week retreat helped equities and bonds stabilize. For Singapore, a trade-sensitive and financially open market, the practical implication is that the next market move is likely to depend less on the already strong August export number than on whether oil-supply risk and global yields continue to ease.
Bottom line
The trailing week produced a modest net loss for Singapore equities, but the path was more important than the endpoint: a sharp September 15 decline, followed by a partial recovery and a slightly weaker final session. The constructive domestic signal was August NODX growth of 46.2%; the principal risks were 2.2% inflation, elevated oil prices, and a still-higher longer-term bond-yield backdrop. Investors should treat the late-week rebound as stabilization, not confirmation of a new uptrend, until the STI can recover the prior week’s close and cross-asset pressure remains contained.
Data caveat: the September 18 STI value comes from a market-data quotation, while the detailed daily table available in the research covered September 16-17. The approximate weekly change is calculated from the September 11 and September 18 reported levels.
References
- Singapore 10Y Bond Yield - Quote - Chart - Historical Data - News. https://tradingeconomics.com/singapore/government-bond-yield
- sgd/usd (sgdusd=x). https://finance.yahoo.com/quote/SGDUSD%3DX/history
- Singapore Exchange (SGX). https://www.sgx.com/research-education/market-updates/20260914-reit-watch-s-reits-extend-fundraising-momentum-2026
- Singapore Stock Market (STI) - Quote - Chart - Historical Data - News | Trading Economics
- Singapore’s External Trade – August 2026. https://www.enterprisesg.gov.sg/resources/media-centre/media-releases/2026/september/mr04226_singapore-external-trade-august-2026
- STI- Singapore Straits Times Index September 2026 | countryeconomy.com. https://countryeconomy.com/stock-exchange/singapore?dr=2026-09
- Singapore Inflation Rate
- *STI Today: Singapore Market Indices & Constituents | SGinvestors.io *. https://sginvestors.io/market/ftse-st-indices-straits-times-index-constituents
- Stock Market Today (Sept. 14, 2026): S&P 500 falls on …. https://au.finance.yahoo.com/news/stock-market-today-sept-14-133832281.html
- Stock Market Today (Sept. 18, 2026): S&P 500 edges higher after Fed rate hike lifts stocks - TheStreet. https://www.thestreet.com/stock-market-today/stock-market-today-dow-jones-sp-500-nasdaq-updates-sept-18-2026