STORA ENSO OYJ STOCK EXCHANGE RELEASE 16 June 2025 at 17:00 EEST Stora Enso Oyj received a notification pursuant to chapter 9, section 5 of the Securities Market Act from BlackRock, Inc on 16 June 2025. On 13 June 2025, BlackRock's holding, including holding through financial instruments, in Stora Enso's shares increased above the 5 percent threshold. +----------------+--------------+-----------------------------+---------------+ | |% of shares |% of shares and voting rights|Total of both | | |and voting |through financial instruments|in % (7.A + | | |rights |(total of 7.B) |7.B) | | |(total of 7.A)| | | +----------------+--------------+-----------------------------+---------------+ |Resulting |4.30% shares |0.72% shares |5.03% shares | |situation on the| | | | |date on |Below 5% |Below 5% voting rights |Below 5% voting| |which threshold |voting rights | |rights | |was crossed or | | | | |reached | | | | +----------------+--------------+-----------------------------+---------------+ |Position of |Below 5% |Below 5% shares |Below 5% shares| |previous |shares | | | |notification | |Below 5% voting rights |Below 5% voting| |(if applicable) |Below 5% | |rights | | |voting rights | | | +----------------+--------------+-----------------------------+---------------+ A: Shares and voting rights Class/type of Number of % of shares shares shares and and voting voting rights ISIN code (if rights possible) Direct Indirect Direct Indirect (SMA 9:5) (SMA 9:6 (SMA 9:5) (SMA 9:6 and 9:7) and 9:7) FI0009005961 33,931,780 4.30% shares shares Below 5% voting Below 5% rights voting rights SUBTOTAL A 33,931,780 4.30% shares shares Below 5% Below 5% voting rights voting rights B: Financial Instruments according to SMA 9:6a Type of Expiration Exercise/ Physical or Number of % of shares financial date Conversion cash shares and voting instrument Period settlement and rights voting rights American N/A N/A Physical 405,720 0.05% shares Depositary shares Receipt Below 5% (US86210M1062) Below 5% voting rights voting rights Securites lent N/A N/A Physical 5,336,400 0.67% shares shares Below 5% Below 5% voting rights voting rights SUBTOTAL B 5,742,120 0.72% shares shares Below 5% Below 5% voting rights voting rights Stora Enso has two series of shares. Each A share and every ten R shares carry one vote. Stora Enso has 175,552,207 A shares and 613,067,780 R shares in issue. The Company does not hold its own shares. The total number of Stora Enso shares is 788,619,987 and the total number votes at least 236,859,985. Investor enquiries: Jutta Mikkola SVP Investor Relations tel. +358 50544 6061 Stora Enso The forest is at the heart of Stora Enso, and we believe that everything made from fossil-based materials today can be made from a tree tomorrow. We are the leading provider of renewable products in packaging, biomaterials, and wooden construction, and one of the largest private forest owners in the world. In 2024, Stora Enso had approximately 19,000 employees, and the Group sales were EUR 9 billion. Stora Enso's shares are listed on Nasdaq Helsinki Oy (STEAV, STERV) and Nasdaq Stockholm AB (STE A, STE R). In addition, the shares are traded in the USA OTC Markets (OTCQX) as ADRs and ordinary shares (SEOAY, SEOFF, SEOJF). storaenso.com (https://www.storaenso.com/en/investors/governance/annual -general-meeting) STORA ENSO OYJ Investor enquiries: Jutta Mikkola SVP Investor Relations tel. +358 50 544 6061