DBS Group led the decline, with shares falling 4.4% to 74.00 Singapore dollars. Peers followed suit: Oversea-Chinese Banking Corp. dropped 4.65% to 28.89 Singapore dollars, while United Overseas Bank slid 5.1% to 40.29 Singapore dollars. Because these three institutions account for over half the weight of the local benchmark index, their collective losses pulled the broader market deep into the red.

The sell-off follows a period of investor enthusiasm fueled by robust dividends and share buybacks. Market strategist James Ooi of Tiger Brokers noted that the market is now reacting to a Citi downgrade of OCBC from neutral to sell. Analysts suggest that the initial optimism surrounding Singapore-dollar interest rates may have been premature. Citi analyst Tan Yong Hong warned that exceptional wealth-management fees from the first half of the year are likely to normalize, putting pressure on third-quarter results due in November. The core issue remains whether asset yields can outpace rising funding costs to preserve net interest margins.