Teleste Corporation Stock exchange release October 3, 2023, at 13:00 EEST TELESTE CORPORATION: FLAGGING NOTIFICATION IN ACCORDANCE WITH CHAPTER 9, SECTION 10 OF THE SECURITIES MARKETS ACT Teleste Corporation has received a notification from Mandatum plc on 1 October, 2023, in accordance with the Finnish Securities Markets Act Chapter 9, Section 5. According to the notification, the legal person exercising ultimate control over the shares subject to the flagging obligation held by Mandatum Life Insurance Company Limited has changed from Sampo plc to Mandatum plc in connection with the partial demerger of Sampo plc on 1 October 2023. According to the notification, Mandatum plc owned indirectly a total of 1 683 900 shares in Teleste Corporation on 1 October 2023. The holding corresponds to 8.87 per cent of all shares and votes in Teleste Corporation. Total position of person subject to the notification obligation: % share % of shares Total of Total number of shares s and and voting both in % and voting rights of voting rights issuer rights through financial instruments Resulting situation 8,87 % 0 8,87 % 18 985 588 of the date on which the threshold was crossed or reached Positions of 5,85 % 0 5,85 % previous notification (if applicable) Notified details of the resulting situation on the date on which the threshold was crossed or reached: A: Shares and voting rights Class/type Number of % of shares and voting rights of shares shares and ISIN code voting rights Direct (SMA Indirect (SMA Direct Indirect (SMA 9:6 and 9:7) 9:5) 9:6 and 9:7) (SMA 9:5) FI0009007728 0 1 683 0 8,87 % 900 Subtotal 1 683 900 8,87 % Information in relation to the person subject to the notification obligation and full chain of controlled undertakings through which the shares, voting rights and/or the financial instruments are effectively held (starting with the ultimate controlling natural person or legal entity): Name % share % of shares Total number of shares s and and voting and voting rights of voting rights issuer rights through financial instruments Mandatum plc 0 0 0 Mandatum Holding 0 0 0 Ltd Mandatum Life 8,87 % 0 8,87 % Insurance Company Ltd TELESTE CORPORATION Esa Harju CEO Additional information: Esa Harju CEO, Teleste Corporation Tel. +358 2 2605 611 esa.harju@teleste.com About Teleste Teleste offers an integrated product and service portfolio that makes it possible to build and run a better networked society. Our solutions bring television and broadband services to you, secure your safety in public places and guide your use of public transport. With solid industry experience and drive for innovations, we are a leading international company in broadband, security and information technologies and related services. We connect with our customers through a global network of offices and partners. In 2022, Teleste's net sales reached EUR 165 million and it had approximately 860 employees. Teleste is listed on Nasdaq Helsinki. For more information, visit www.teleste.com.