The Stockholm Stock Exchange opened the trading week with clear declines following rising oil prices, geopolitical concerns, and broad global market falls. Stockholm underperformed international peers but recovered some of its sharp initial losses during the afternoon as oil prices retreated from their peak. Wall Street opened Monday's session with falling prices.

At the close, the OMXS30 index was down 1.50 percent to 2,992.86. Shares worth approximately 27.2 billion kronor were traded on the Stockholm Stock Exchange.

The best performance among the exchange's major industrial sectors was utilities, with an increase of 4.9 percent. At the other end of the scale, basic materials trailed the market, falling 2.7 percent.

Among the leading shares included in the OMXS30 index, Saab B rose 3.1 percent while Evolution was up 0.9 percent. The weakest performance came from SKF B, down 3.8 percent, while Assa Abloy B fell 3.3 percent.

Several countries in the Middle East have announced production cuts, and Brent oil traded above 100 dollars during parts of the day. However, G7 countries calmed the market by stating they could open up for the use of strategic reserves to ensure supply. Furthermore, Donald Trump intends to submit a plan to handle the rising oil prices.

"I have a plan for everything. You are going to be very happy," he said in an interview with the New York Post.

Investment company Kinnevik was a major loser. The B-share retreated nearly 17 percent after Ningi Research released a short-selling report. Kinnevik has stated that it will respond to the short report shortly.

Power and automation company ABB plans to invest approximately 75 million dollars in India during 2026 to expand manufacturing and research at five locations. The investment aims to meet increased demand linked to the energy transition, data centers, and public transport. The company also announced that it is integrating Nvidia's technology into its RobotStudio. The stock fell 2.1 percent.

Fuel cell company Powercell was among Monday's big losers after the company was accused in an investigation by SVT and NRK of selling hydrogen systems despite internal warnings about technical flaws and a significantly shorter lifespan than what customers were told. According to the reports, systems marketed for 33,000 hours reached around 3,000 hours in tests. The board of Powercell issued a statement in the afternoon rejecting the allegations of faulty technology and expressing support for management. The stock plummeted over 24 percent.

Several management changes were also presented. Serial acquirer Röko announced that CEO Fredrik Karlsson is leaving the post, to be replaced by CFO Johan Bladh. Karlsson remains operational in the company and will become, among other things, deputy CEO. The stock was down 1.5 percent. Pulp producer Rottneros has appointed Per Bjurbom as the new CEO. He will take office shortly. Former CEO Lennart Eberleh resigned in mid-December. The stock bucked the trend and rose 4.6 percent.

Nuclear technology company Studsvik is acquiring Kàrnfull Next to broaden its operations toward the development of new nuclear power projects, particularly small modular reactors. The enterprise value amounts to approximately 6.5 million euros, and the deal is expected to close during the second quarter. The stock increased 9 percent.

A series of stock recommendations were also received. SB1 Markets has initiated coverage of technical consultants Sweco, Afry, and Rejlers. Sweco and Rejlers receive buy recommendations with target prices of 170 and 210 kronor respectively, while Afry is initiated with neutral and a target price of 139 kronor. The shares traded down following the analyses. Sweco's B-share retreated 1.6 percent, Afry fell 2.6 percent, and Rejlers sank 0.9 percent.

Hygiene and health company Essity was down 0.8 percent after Handelsbanken initiated coverage with a buy recommendation and a target price of 320 kronor. Medtech company Sectra rose 0.3 percent after SEB raised its recommendation to buy from hold and simultaneously raised the target price to 250 kronor from 195.

Mining company Lundin Mining fell 6 percent after JP Morgan downgraded the stock to underweight from neutral.

Debt management company Hoist rose 2.1 percent after Dagens industri placed a buy rating on the stock.

Cloud communications company Sinch retreated 4.7 percent after Bank of America lowered its recommendation to underperform from neutral.