The Oslo Stock Exchange opened lower on Tuesday, with the main index dropping more than 1% in early trading.
The broad-based decline was led by Telenor, whose shares fell sharply after the telecom operator reported a challenging quarter that disappointed market expectations.
Energy markets also contributed to the negative sentiment, with crude oil prices down around 1% since midnight, trading near $84.
Telenor's underperformance reflects ongoing headwinds for the company, which has cited difficult year-on-year comparisons and financial drag from integration activities in its recent results.
The stock's weakness added significant weight to the broader market sell-off, extending the pressure seen in Oslo trading earlier in the week.
Energy markets also contributed to the negative sentiment, with crude oil prices down around 1% since midnight, trading near $84.70 a barrel ahead of the market open.
The softening in oil prices mirrored the broader risk-off tone across Norwegian equities.