The Stockholm Stock Exchange started the new trading week with a slight decline on Monday. Trading opened upwards but quickly began to fall and then closed in the red. Out in Europe, there was a mixed performance. Wall Street posted gains.

At the close, the OMXS30 index was down 0.12 percent to 2,506.91. Shares worth around SEK 15.4 billion were traded on the Stockholm Stock Exchange.

The best performance among the stock exchange's major industrial sectors was energy with a rise of 0.63 percent. At the other end of the scale, real estate was at the bottom with minus 1.88 percent.

Among the leading shares, which are included in the OMXS30 index, Saab rose 2.1 percent while Boliden was up 1.5 percent. Nibe was the worst performer, down 4.5%, while Getinge was down 4.3%.

In the news flow, it was noted that the pharmaceutical company Astra Zeneca's product Tagrisso is proposed to be approved in the EU for the treatment of EGFR-mutated lung cancer. Astra Zeneca fell 0.5%.

Credit management company Intrum's shares fell 3.9%. On Friday after the close, the company announced that it had filed for voluntary reorganization in the US under Chapter 11.

The specialty steel company Alleima received a major order for steam generator tubes in the nuclear power segment with a total value of approximately SEK 250 million. The order was placed by one of the world's leading suppliers of nuclear power equipment. Alleima rose 2.8 percent.

The investment company Svolder's net asset value decreased by SEK 1 to SEK 55 per share during the previous week. Svolder's B-share fell 4.5 percent.

Credit management company Hoist fell 5.5 percent. The company announced that the Swedish Financial Supervisory Authority has made an interpretation of the criteria for the company to qualify as a specialized debt restructuring company, SDR. Finansinspektionen's interpretation differs from Hoist's own.

The heating technology company Nibe fell 4.5 percent. In an article, The Telegraph wrote that the UK's Labor government plans to drastically reduce the fines that gas boiler manufacturers can receive if they fail to sell enough heat pumps. At the same time, several target prices were lowered for the stock, with Inderes choosing to cut its recommendation to reduce from increase.

Life science investment company Karolinska Development's portfolio company Umecrine Cognition will present positive data from a recently completed interim analysis. Karolinska Development rose 12.2 percent.

Technology company Intellego's shares rallied 28.7 percent. The company signed a five-year agreement in China for exclusive sales and marketing rights for a product related to the disinfection market. The minimum volumes are said to be 360 million dollars.

On the analysis front, Dagens industri chose to put a buy on Investor's share, which rose 0.6 percent.

Industrial company Engcon fell 0.7 percent after Affärsvärlden gave a neutral recommendation.

Aktiespararna recommended buy for Medicover, which fell 1 percent.