Singapore shares closed the week in the red zone on Friday, tracking regional losses as most markets showcased concerns over a potential tech bubble.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,421.89 and 4,442.56 throughout the day. It ended the session at 4,427.06, down 13.44 points or 0.3% compared to Thursday's close.

Seatrium down about 7%; ST Engineering, SIA Engineering down around 3%; Kep Infra Tr, iFast, Sats down about 2%; Haw Par up 3%; ProNex up over 4%.

In company news, shares of HealthBank zoomed over 72% at the close with the company looking to raise around SG$422,685 through the subscription agreement of up to 15.5 million shares at SG$0.02727 per share.

Seatrium's shares were down nearly 7% after its subsidiary Seatrium Energy (International), received a notice of termination of a contract by Maersk Offshore Wind.

Meanwhile, shares of Nanofilm Technologies International were down nearly 5% as it outlined plans to voluntarily liquidate its subsidiary, Nanofilm Technologies Europe.