Singapore shares opened marginally higher on Friday as investors remained cautious amid a mixed overnight session on Wall Street, with the Dow Jones Industrial Average closing at a record high while losses in technology shares dragged the Nasdaq Composite.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, rose marginally in early trade by 0.07%, or 3.99 points, to open at 5,221.140.

Early trading witnessed 67.55 million shares worth SG$201.54 million traded, with gainers outnumbering losers 85 to 72, which indicated selective buying across the broader market.

An S&P Global survey published Friday morning showed that Singapore's private-sector activity strengthened in June, with the S&P Global Singapore Purchasing Managers' Index rising to 57.4 from 56.7 in May.