Tieto: Share repurchases on week 20

Tieto Corporation    Stock exchange release    18 May 2026 at 03:00 p.m. EET

Tieto: Share repurchases on week 20

In the Helsinki Stock Exchange

Date Quantity Average price Total price 11.5.2026 30 000 19,5969 587 907 12.5.2026 40 000 19,3457 773 828 13.5.2026 50 000 19,376 968 800 14.5.2026 0 0 0 15.5.2026 40 000 19,4735 778 940 Total in week 20 160 000 19,4342 3 109 475

Tieto now holds a total of 810,000 shares including the shares repurchased on 15.5.2026

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