The Stockholm Stock Exchange opened Monday's session in negative territory, tracking the performance of leading European bourses. Brent crude prices are surging, currently trading around 101.50 dollars per barrel. In corporate news, Hexagon has announced a significant acquisition.

Peace negotiations between the U.S. and Iran in Pakistan over the weekend have failed. President Donald Trump has announced that the U.S. is implementing its own blockade of the Strait of Hormuz. According to Trump, the objective is to ensure free passage without Iran being able to levy fees.

The U.S. also plans to clear mines in the area and take action against vessels that have paid Iran for safe passage. Other nations are expected to participate in the operation. Trump simultaneously warned of forceful military action should Iran attack American targets or vessels.

As of 09:20 CET, the OMXS30 index was down 0.90 percent at 3,081.97. Shares worth approximately 1.9 billion kronor had changed hands on the Stockholm Stock Exchange.

Energy was the best-performing major industrial sector, posting a 5.3 percent gain. At the other end of the spectrum, the financial sector lagged, declining 1.0 percent.

Among the blue-chip stocks in the OMXS30 index, Nibe B rose 3.2 percent while Tele 2 B gained 0.5 percent. Industrivärden C saw the weakest performance, falling 3.2 percent, while Sandvik retreated 2.2 percent.

Measurement technology firm Hexagon is acquiring Waygate Technologies from Baker Hughes in a deal valued at 1.45 billion dollars, equivalent to 13.5 billion kronor. Waygate employs 1,500 people and operates in computed tomography, radiography, and remote visual inspection, with revenues of 630 million dollars (5.9 billion kronor). The acquisition target reported an operating margin of 10 percent in 2025. Hexagon shares are down 0.9 percent.

Gaming developer Enad Global 7 has completed cost-cutting measures within its Petrol and Piranha Games business units. Furthermore, board fees and CEO compensation are being reduced. These measures are expected to yield annual cost savings of 32 million kronor, effective from the second quarter of 2026. The stock is up 3.7 percent.

Diabetes research firm Diamyd Medical is terminating its Phase 3 Diagnode-3 study following a subsequent evaluation of the results. Concurrently, a strategic review has been initiated, encompassing the evaluation of external assets, partnerships, and potential corporate transactions. The company had previously reported failed Phase 3 results in the study. The stock is tumbling by over 13 percent.

E-commerce company Nelly is climbing 7.1 percent following a buy recommendation from Dagens industri.

A series of other rating changes have been issued. Industrivärden is falling following a sell rating from SEB.

BNP Paribas has resumed coverage of Nibe with an outperform rating. Furthermore, France plans to nearly double its electrification support to 10 billion euros per year by 2030, up from the current 5.5 billion euros, a move that could benefit Nibe.

Pareto has dropped its buy recommendation for Volvo, downgrading the stock to neutral. The shares are down 1.5 percent.

Nordea has upgraded its rating for SKF to buy. However, the stock is still trading down 0.7 percent.