Tieto Oyj TIETO ACQUISITION OR DISPOSAL OF AN ISSUER'S OWN SHARES

Tieto: Share repurchases on week 25

22. June 2026 kl. 14:00

Tieto Corporation    Stock exchange release    22 Jun 2026 at 03:00 p.m. EET

Tieto: Share repurchases on week 25

In the Helsinki Stock Exchange

Date Quantity Average price Total price 15.6.2026 40 000 20,3728 814 912,00 16.6.2026 40 000 20,2694 810 776,00 17.6.2026 40 000 20,3701 814 804,00 18.6.2026 75 000 19,5083 1 463 122,50 Total in week 25 195 000 20,0185 3 903 614,50

Tieto now holds a total of 1,055,000 shares including the shares repurchased on 18.6.2026

The share buybacks are executed in compliance with Regulation No. 596/2014 of the European Parliament and Council (MAR) Article 5 and the Commission Delegated Regulation (EU) 2016/1052.

On behalf of Tieto Corporation

Nordea Bank Oyj

Sami Huttunen Ilari Isomäki

For further information, please contact:

Tommi Järvenpää, Head of Investor Relations, tel. +358 40 576 0288, tommi.jarvenpaa(at)tieto.com

Distribution NASDAQ Helsinki NASDAQ Helsinki Oslo Børs Principal Media

Tieto is a leading software and digital engineering services company with global market reach and capabilities. We provide customers across different industries with mission-critical solutions through our specialized software businesses Tieto Caretech, Tieto Banktech and Tieto Indtech as well as Tieto Tech Consulting business. Our around 14 000 talented vertical software, design, cloud and AI experts are dedicated to empowring our customers to succeed and innovate with latest technology.

Tieto`s annual revenue is approximately EUR 2 billion. The company`s shares are listed on the NASDAQ exchange  in Helsinki and Stockholm, as well as on Oslo Børs. www.tieto.com