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

Tieto: Share repurchases on week 24

15. June 2026 kl. 14:00

Tieto Corporation    Stock exchange release    15 Jun 2026 at 03:00 p.m. EET

Tieto: Share repurchases on week 24

In the Helsinki Stock Exchange

Date Quantity Average price Total price 8.6.2026 40 000 20,835 833 400 9.6.2026 40 000 20,7869 831 476 10.6.2026 40 000 20,4299 817 196 11.6.2026 50 000 20,1928 1 009 640 12.6.2026 40 000 20,3345 813 380 Total in week 24 210 000 20,5004 4 305 092

Tieto now holds a total of 860,000 shares including the shares repurchased on 12.6.2026

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