Stora Enso Oyj: Notification of Change in Holdings according to Chapter 9, Section 10 of the Finnish Securities Markets Act (21 August 2026)

STORA ENSO OYJ STOCK EXCHANGE RELEASE 24 August 2026 at 16:00 EEST Stora Enso Oyj received a notification pursuant to chapter 9, section 5 of the Securities Market Act from BlackRock, Inc on 24 August 2026. On 21 August 2026, BlackRock's holding, including holding through financial instruments, in Stora Enso's shares decreased below the 5 percent threshold. ────────────────────────┬───────────────┬─────────────────────────┬───────────── │% of shares and│% of shares and voting │Total of both │voting rights │rights through financial │in % (7.A + │(total of 7.A) │instruments │7.B) │ │(total of 7.B) │ ────────────────────────┼───────────────┼─────────────────────────┼───────────── Resulting situation on │Below 5% shares│Below 5% shares │Below 5% the date on which │ │ │shares threshold was crossed or│Below 5% voting│Below 5% voting rights │ reached │rights │ │Below 5% │ │ │voting rights ────────────────────────┼───────────────┼─────────────────────────┼───────────── Position of previous │3.38% shares │1.61% shares │5.00% shares notification (if │ │ │ applicable) │Below 5% voting│Below 5% voting rights │Below 5% │rights │ │voting rights ────────────────────────┴───────────────┴─────────────────────────┴───────────── ──────────────────────────────────────────────────────────────────────────────── A: Shares and voting rights ─────────────────┬───────────────────────────────┬────────────────────────────── Class/type of │Number of shares and voting │% of shares and voting rights shares │rights │ │ │ ISIN code (if │ │ possible) │ │ ─────────────────┼────────────┬──────────────────┼────────────────────────────── Direct │Indirect │Direct │Indirect │ │ │ (SMA 9:5) │(SMA 9:6 and│(SMA 9:5) │(SMA 9:6 and │9:7) │ │9:7) ─────────────────┼────────────┼──────────────────┼────────────┬ FI0009005961 │ │Below 5% shares │ │Below 5% shares │ │ │ │ │ │Below 5% voting │ │Below 5% voting │ │rights │ │rights │ │ │ │ ─────────────────┼────────────┴──────────────────┼────────────┴───────────────── SUBTOTAL A │Below 5% shares │Below 5% shares │ │ │Below 5% voting rights │Below 5% voting rights ─────────────────┴───────────────────────────────┴────────────────────────────── ──────────────────────────────────────────────────────────────────────────────── B: Financial Instruments according to SMA 9:6a ────────────────┬───────┬───────────┬───────────┬───────────────┬─────────────── Type of │Expirat│Exercise/ │Physical or│Number of │% of shares and financial │ion │Conversion │cash │shares and │voting rights instrument │date │Period │settlement │voting rights │ ────────────────┼───────┼───────────┼───────────┼───────────────┼─────────────── American │N/A │N/A │Physical │Below 5% shares│Below 5% shares Depositary │ │ │ │ │ Receipt │ │ │ │Below 5% voting│Below 5% voting (US86210M1062) │ │ │ │rights │rights ────────────────┼───────┼───────────┼───────────┼───────────────┼─────────────── Securities lent │N/A │N/A │Physical │Below 5% shares│Below 5% shares │ │ │ │ │ │ │ │ │Below 5% voting│Below 5% voting │ │ │ │rights │rights ────────────────┼───────┼───────────┼───────────┼───────────────┼─────────────── CFD │N/A │N/A │Cash │Below 5% shares│Below 5% shares │ │ │ │ │ │ │ │ │Below 5% voting│Below 5% voting │ │ │ │rights │rights ────────────────┼───────┼───────────┼───────────┼───────────────┼─────────────── │ │ │SUBTOTAL B │Below 5% shares│Below 5% shares │ │ │ │ │ │ │ │ │Below 5% voting│Below 5% voting │ │ │ │rights │rights ────────────────┴───────┴───────────┴───────────┴───────────────┴─────────────── Stora Enso has two series of shares. Each A share and every ten R shares carry one vote. Stora Enso has 175,511,884 A shares and 613,108,103 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 236,822,694. Full chain of controlled undertakings through which the voting rights and financial instruments are effectively held starting with the ultimate controlling natural person or legal entity is presented in the enclosed annex. Investor enquiries: Jutta Mikkola SVP Investor Relations tel. +358 50 544 6061 Stora Enso is a global leader in renewable materials with a strong focus on packaging. Our purpose is to replace non-renewable materials with renewable solutions. Together with our customers, we design and deliver competitive, high-quality packaging materials and solutions, made from fresh and recycled fibers, accelerating the transition to a circular bioeconomy. Stora Enso has approximately 19,000 employees and our sales in 2025 were EUR 9.3 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 on OTC Markets (OTCQX) in the USA as ADRs and ordinary shares (SEOAY, SEOFF, SEOJF). storaenso.com STORA ENSO OYJ Investor enquiries: Jutta Mikkola SVP Investor Relations tel. +358 50 544 6061 [1]: https://www.storaenso.com/en/investors