The Stockholm Stock Exchange experienced a volatile session on Wednesday, with indices oscillating around the flatline before ultimately closing in negative territory.

Market focus centered on U.S. inflation data for May, which landed in line with expectations. Meanwhile, oil prices rose approximately 1.5 percent following renewed threats against Iran from Donald Trump, who suggested that Iran is stalling on a deal.

At the close, the OMXS30 index was down 0.53 percent at 3,054.04. Shares worth approximately SEK 22.8 billion changed hands on the Stockholm Stock Exchange.

Among the major industrial sectors, energy performed best with a 1.2 percent gain. At the other end of the spectrum, basic materials lagged, falling 1.3 percent.

Among the blue-chip stocks included in the OMXS30 index, Evolution climbed 3.1 percent while Tele 2 B rose 2.2 percent. Volvo B saw the weakest performance, dropping 3.7 percent, while Boliden declined 2.6 percent.

Ventilation company Systemair reported fourth-quarter results where both revenue and adjusted operating profit exceeded analyst expectations. The board proposes a 7.4 percent dividend hike to SEK 1.45 per share, and the company aims to double its turnover within seven years. The stock surged over 8 percent.

Truck and bus manufacturer Volvo described the market situation as remaining stable during Wednesday's capital markets day in Eskilstuna. CFO Mats Backman stated that demand and deliveries in Europe are at healthy levels across all business areas, while demand in North America remains strong and production is gradually increasing.

Specialty steel company Alleima rose 3 percent. The company has secured an order for advanced umbilical tubes worth approximately SEK 995 million from a global subsea equipment provider.

Nordtech gained 1.7 percent in its trading debut on Nasdaq Stockholm after the offering was several times oversubscribed. The company acquires and develops B2B software firms within niche market verticals in the Nordic region.

Real estate mogul Rutger Arnhult's holding company, M2 Asset Management, is purchasing Gårdarike's stake in the property company Corem. Following the transaction, Arnhult controls 52 percent of the capital and 64 percent of the votes in the company. Corem's B-share rose 2.5 percent.

Real estate company Wallenstam has signed an agreement to sell all its wind farms to Locus Energy. The deal includes 53 wind turbines with an installed capacity of 112 MW and a value of SEK 830 million. The stock rose 1.4 percent.

Medical technology company Episurf Medical has signed an agreement to acquire Kuststaden Invest and its property-owning subsidiaries at an agreed real estate value of SEK 647 million. The portfolio comprises some 20 properties, primarily in Oskarshamn. The stock was down 2.4 percent.

Real estate company Emilshus is issuing 12 million preference shares at a subscription price of SEK 30 per share, representing a 4.9 percent discount to Tuesday's closing price. The issuance will provide the company with SEK 360 million. The preference share fell 3.5 percent.

Balcony manufacturer Balco has signed a turnkey contract with a housing cooperative in Nacka. The order value amounts to SEK 106 million. The stock rose 2.4 percent.

Volati's common shares nearly halved in price as the stock traded ex-rights to shares in Salix Group. The spin-off is scheduled for listing on Nasdaq Stockholm on June 15.

Credit management firm Intrum rose as the stock traded ex-subscription rights in its rights issue. The share was up nearly 45 percent when adjusted for the separation of the subscription rights.

On the analyst front, SB1 has initiated coverage of Scandi Standard with a buy recommendation. The stock rose 7.7 percent.

Handelsbanken has initiated coverage of Coffee Stain with a buy recommendation. The stock increased 0.5 percent.