The Stockholm Stock Exchange concluded a heavy day of earnings reports with a decline, while leading European bourses saw stronger performance. Several heavyweights presented their interim reports today, including Atlas Copco, Assa Abloy, and Boliden.

At the close, the OMXS30 index was down 0.77 percent at 3,056.01. Shares worth approximately SEK 26.5 billion were traded on the Stockholm Stock Exchange.

Consumer staples saw the best performance among the major industrial sectors, rising 2 percent. At the other end of the scale, basic materials trailed the market, falling 2.2 percent.

Among the leading stocks in the OMXS30 index, Evolution rose 0.9 percent while Nordea gained 0.8 percent. The weakest performers were Atlas Copco A, down 5.5 percent, and Boliden, which fell 3.0 percent.

Engineering giant Atlas Copco reported an adjusted operating profit approximately 2 percent below expectations. The company's revenue and order intake were also just over 2 percent lower than anticipated. The company expects customer activity to remain at current levels.

Mining company Boliden reported an operating profit for the first quarter of 2026 that beat analysts' expectations, though revenue came in lower than forecast. Boliden provided updated 2026 guidance for its troubled Garpenberg mine.

Lock specialist Assa Abloy reported revenue and adjusted operating profit in line with expectations for the first quarter. Assa shares retreated 1.5 percent.

Packaging company Billerud's adjusted EBITDA for the first quarter was significantly weaker than analysts' expectations, despite revenue coming in above consensus. The company expects to restore a strong underlying profitability level in the second quarter. Billerud plummeted 13.6 percent.

Engineering consultancy Sweco's EBITA came in below analysts' expectations, while revenue was in line with consensus. Sweco fell 6.2 percent.

Steelmaker SSAB beat expectations for both revenue and operating profit in the first quarter. SSAB shares declined 2.8 percent.

AAK, which produces plant-based specialty ingredients, increased its operating profit in line with expectations for Q1. AAK climbed 9.5 percent.

Forestry group Holmen's revenue and operating profit, however, came in lower than expected. Holmen sank 1.1 percent.

Climate control company Munters reported revenue and adjusted earnings in line with expectations for the first quarter, though order intake surprised to the upside. Munters was down 2.2 percent.

Security firm Securitas reported an interim report in line with expectations. Securitas fell 4.1 percent.

Pharmaceutical company Orexo reported lower revenue and an increased loss in the first quarter of 2026 compared to the same quarter last year. The company holds a large cash position following the sale of Zubsolv US. Orexo fell 3.1 percent.

Outdoor apparel company Revolution Race significantly increased its operating profit in the third quarter of its broken fiscal year. Revenue also rose. The company noted continued sales growth during the first weeks of April. The stock plunged 14.5 percent.

Audiobook specialist Storytel reported lower-than-expected revenue for the first quarter, while EBITDA was in line with expectations. The stock retreated 5.5 percent.

E-commerce company Nelly crashed 41 percent following its report. Operating profit fell by nearly 60 percent to SEK 8 million.

Professional kitchen equipment maker Electrolux Professional saw its shares sink 11.4 percent after a weaker-than-expected Q1 report.

Measurement technology company Hexagon has set the timetable for the spin-off of its subsidiary Octave, which will be distributed to shareholders. Hexagon will trade ex-rights to Octave on May 21, with Octave expected to begin trading on May 25. The stock fell 1.4 percent.

S&P Global Ratings revised its outlook for real estate company Castellum to negative from stable, while affirming its BBB credit rating. The outlook reflects a risk of a downgrade within 12-24 months if leverage remains high and operational performance weakens. Castellum sank 1.6 percent.

On the analysis front, Nordea has downgraded Hexpol to hold from buy. The stock fell 4.2 percent.

Goldman Sachs has downgraded Bioarctic to neutral (from buy) with a price target of SEK 355. The stock was down 4.6 percent.