STORA ENSO OYJ STOCK EXCHANGE RELEASE 11 August 2025 at 15:15 EEST Stora Enso Oyj received a notification pursuant to chapter 9, section 5 of the Securities Market Act from BlackRock, Inc on 11 August 2025. On 8 August 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 |4.39% shares |0.88% shares |5.28% 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 |Number of |% of shares and voting rights | |of |shares and | | |shares |voting | | | |rights | | |ISIN code | | | |(if | | | |possible) | | | +------------+--------+----------+-----------------+----------------------+ |Direct |Indirect|Direct |Indirect | | | | | | |(SMA 9:5) |(SMA 9:6|(SMA 9:5) |(SMA 9:6 and 9:7)| | |and 9:7)| | | +------------+--------+----------+-----------------+----------------------+ |FI0009005961| |34,678,970| |4.39% shares | | | |shares | | | | | | | |Below 5% voting rights| | | |Below 5% | | | | | |voting | | | | | |rights | | | +------------+--------+----------+-----------------+----------------------+ |SUBTOTAL A |34,678,970 |4.39% shares | | |shares | | | | |Below 5% voting rights | | |Below 5% | | | |voting | | | |rights | | +------------+--------+----------+-----------------+----------------------+ B: Financial Instruments according to SMA 9:6a Type of Expiration Exercise/ Physical Number of % of shares financial date Conversion or shares and voting instrument Period cash and rights settlement voting rights American N/A N/A Physical 458,160 0.05% shares Depositary shares Receipt Below 5% (US86210M1062) Below 5% voting rights voting rights Securites lent N/A N/A Physical 6,203,820 0.78% shares shares Below 5% Below 5% voting rights voting rights CFD N/A N/A Cash 345,170 0.04% shares shares Below 5% Below 5% voting rights voting rights SUBTOTAL B 7,007,150 0.88% 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 236,858,985. 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