Amendment: SEC Form SCHEDULE 13D/A filed by TELUS International (Cda) Inc. Subordinate Voting Shares

Item 4 of the Original Schedule 13D is hereby supplemented and amended to add the following information: On June 11, 2025, the Reporting Person submitted a non-binding indication of interest (the "Non-Binding IOI") to the board of directors of the Issuer (the "Board") in respect of a proposed transaction pursuant to which the Reporting Person would, directly or indirectly through one of its subsidiaries, acquire all of the issued and outstanding Shares in the capital of the Issuer not already owned directly or indirectly by it for a price per Share of US$3.40, to be paid cash, Reporting Person common shares or a combination of both (the "Proposed Acquisition"). The entering into of definitive transaction documents with respect to the Proposed Acquisition is subject to a number of conditions, including, among other matters, confirmatory due diligence satisfactory to the Reporting Person, agreement on transaction structure, the negotiation and execution of mutually acceptable definitive transaction documents, and the formal approval of the Proposed Acquisition by the Board. Further, the consummation of the Proposed Acquisition, even if definitive transaction documents are entered into, would be subject to customary closing conditions for transactions of this nature, including, among others, the receipt of shareholder approvals required under applicable securities laws and court approval. No assurances can be given that definitive transaction documents with respect to the Proposed Acquisition will be entered into, as to the final terms of any transaction or that a transaction will be consummated. The foregoing description of the Non-Binding IOI does not purport to be complete and is qualified in its entirety by reference to the Non-Binding IOI, a copy of which is filed as an exhibit hereto and is incorporated herein by reference. The Proposed Acquisition may result in one or more of the actions specified in clauses (a)-(j) of Item 4 of Schedule 13D, including the acquisition or disposition of additional securities of the Issuer, a merger or other extraordinary corporate transaction involving the Issuer, a change to the present composition of the Board, a change to the present capitalization or dividend policy of the Issuer, the delisting of the Issuer's securities from the New York Stock Exchange, and a class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934. The Reporting Person may further consider pursuing other plans, proposals or other courses of action with the Issuer's management, the Board, other Issuer shareholders, advisors or other persons which could relate to, or result in, several of the matters referred to in clauses (a)-(j) of Item 4 of Schedule 13D.

Item 6 of the Original Schedule 13D is hereby further supplemented and amended to add the information contained in Item 4 of this Amendment No. 3, which is incorporated by reference into this Item 6 as if fully set forth herein.

1 Share Purchase Agreement, dated May 16, 2023, between the TELUS International Holding Inc. and BPEA (incorporated by reference to Exhibit 99.1 to the Schedule 13D furnished to the SEC on May 26, 2023). https://www.sec.gov/Archives/edgar/data/868675/000094787123000637/ss2117895_ex9901.htm#Purchase 2 Shareholders' Agreement, dated February 5, 2021, among TELUS Communications Inc. and BPEA and the Issuer (incorporated by reference to Exhibit 10.7 to the amendment to the Issuer's Registration Statement on Form F-1 filed with the SEC on January 19, 2021 (SEC File No. 333-251993)). https://www.sec.gov/Archives/edgar/data/1825155/000104746921000112/a2242795zex-10_7.htm#Shareholder 3 Amendment No. 1 to the Shareholders' Agreement, dated March 9, 2023 (incorporated by reference to Exhibit 99.1 to the Issuer's Current Report furnished to the SEC on Form 6-K on March 15, 2023). https://www.sec.gov/Archives/edgar/data/1825155/000094787123000327/ss1844731_ex9901.htm#Amendment%20March%209 4 Registration Rights Agreement, dated February 5, 2021, among TELUS Communications Inc., TELUS International Holding Inc., 1276431 B.C. LTD., 1276433 B.C. LTD., 1276435 B.C. LTD., 1276436 B.C. LTD. BPEA and the Issuer (incorporated by reference to Exhibit 99.3 to the Issuer's Current Report furnished to the SEC on Form 6-K on February 5, 2021). https://www.sec.gov/Archives/edgar/data/1825155/000110465921013075/a20-31342_25ex99d3.htm#Registration 5 Amendment to the Registration Rights Agreement, dated January 3, 2023 (incorporated by reference to Exhibit 99.3 to the Issuer's Current Report furnished to the SEC on Form 6-K on January 9, 2023). https://www.sec.gov/Archives/edgar/data/1825155/000110465923002251/tm231731d1_ex99-3.htm#Amendment%20January%203 6 Amended and Restated Shareholders' Agreement, dated as of June 16, 2023, among the Reporting Person, BPEA and the Issuer (incorporated by reference to Exhibit 99.7 to the Issuer's Current Report furnished to the SEC on Form 6-K on August 4, 2023). https://www.sec.gov/Archives/edgar/data/1825155/000162828023027393/a997telusinternational-a.htm 7 Amendment to the Amended and Restated Shareholders' Agreement, dated as of December 16, 2023 (filed as Exhibit 2.8 to the 2023 20-F). https://www.sec.gov/Archives/edgar/data/1825155/000162828024003978/exhibit28amendmenttoshar.htm 8 Second Amendment and Joinder to the Registration Rights Agreement, dated as of June 16, 2023 (incorporated by reference to Exhibit 99.6 to the Issuer's Current Report furnished to the SEC on Form 6-K on August 4, 2023). https://www.sec.gov/Archives/edgar/data/1825155/000162828023027393/a996telusinternationalti.htm 9 Third Amendment to the Registration Rights Agreement, dated as of December 21, 2023 (filed as Exhibit 2.6 to the 2023 20-F). https://www.sec.gov/Archives/edgar/data/1825155/000162828024003978/exhibit26amendmenttoregi.htm 10 Non-binding indication of interest letter, dated June 11, 2025.