The OMX Helsinki 25 index declined 0.9 percent over the past week, reflecting a split between resilient industrial names and sharp drops driven by company-specific developments.

Swedish steelmaker SSAB, listed in Helsinki and Stockholm, led the gainers with a near 6% rise over five days, supported by steady demand expectations. Forestry group UPM-Kymmene, which produces pulp, paper, and renewable materials, climbed roughly 4%, while Kemira, a chemicals company focused on water-intensive industries, posted similar gains. Stainless steel producer Outokumpu also edged higher, rounding out a strong showing for materials-linked stocks.

On the downside, Konecranes, a global provider of material handling solutions, was the standout decliner, plunging more than 60% over the period. Most of the slump happened after its annual general meeting on March 26, where shareholders approved a significant share split—issuing two new shares for each existing one—alongside a €2.25 dividend. The technical adjustment, combined with the dividend detachment, heavily impacted the share price without signaling a fundamental deterioration. 

Elsewhere, renewable fuels group Neste dropped over 8% amid continued pressure on margins. Nordea Bank, one of the largest financial institutions in the Nordics, also declined, alongside residential real estate company Lumo Kodit and energy company Fortum.

Overall, the week underscored how corporate actions and sector dynamics can drive sharp divergences within the Helsinki market, even as the broader index moved modestly lower.