Common Shares of Thomson Reuters Corporation

THOMSON REUTERS CORP /CAN/

19 Duncan Street, Toronto, A6, M5H 3H1

Thomson Investments Limited, Woodbridge, 1908720 Ontario Limited, 1000706525 Ontario Limited, 1396164 Ontario Limited, 1925124 Ontario Limited, Woodbridge Investments Corporation, KRT Investments Corp., DKRT Family Corp., DKRT Investments Corp., 1000920847 Ontario Limited, MB Finance Corp., TLT Investments Corp., TLT Issue Holdco A Corp., TLT Issue Holdco B Corp., 1761173 Ontario Limited, 2677295 Ontario Limited, 1000919995 Ontario Limited, 1754693 Ontario Limited, PJT Investments Corp., 1000920848 Ontario Limited, PGF Investments Corp., PGF Family Corp., LCC Investments Corp., 1000078931 Ontario Limited, 1000421133 Ontario Limited, LLD Investments Corp., 2806335 Ontario Limited, JRD Investments Corp., 2754783 Ontario Limited, GED Investments Corp., SEG Investments Corp, 1000031857 Ontario Limited, SEG Family Corp., TCM Investments Corp., DYM Investments Corp., BG Investments Corp., ACG Investments Corp., 2775329 Ontario Limited and 2808194 Ontario Limited.

See Schedule A for the address of each Reporting Person.

See Schedule A for certain information as to the executive officers and directors of each Reporting Person.

Further, to the knowledge of each Reporting Person, neither such Reporting Person, nor any executive officer or director of such Reporting Person, has been a party during the last five years to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violation of, or prohibiting or mandating activities subject to, U.S. federal or state securities laws, or finding any violation with respect to such laws.

See Schedule A for certain information as to the executive officers and directors of each Reporting Person. For further explanation of the background of the arrangements relating to ownership of Common Shares, see the "Explanatory Note" above.

See cover pages of this Amendment for each of the Reporting Persons and Schedule A for each of the directors and executive officers of the Reporting Persons.

See cover pages of this Amendment for each of the Reporting Persons and Schedule A for each of the directors and executive officers of the Reporting Persons.

None of the Reporting Persons has effected any transactions in Common Shares during the past 60 days, except as set forth below. On September 10, 2025, 1396164 Ontario Limited acquired 45,357 Common Shares pursuant to the Thomson Reuters Amended and Restated Dividend Reinvestment Plan (the "DRIP"). On September 30, 2025, (i) SEG Investments Corp. acquired 1,126,634 Common Shares from 1000921264 Ontario Limited and 1000921265 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921264 Ontario Limited and 1000921265 Ontario Limited) in connection with the wind-up and dissolution of each of 1000921264 Ontario Limited and 1000921265 Ontario Limited, respectively; (ii) BG Investments Corp acquired 285,160 Common Shares from 1000921257 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921257 Ontario Limited) in connection with the wind-up and dissolution of 1000921257 Ontario Limited; (iii) ACG Investments Corp acquired 65,299 Common Shares from 1000921253 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921253 Ontario Limited) in connection with the wind-up and dissolution of1000921253 Ontario Limited; and (iv) 2808194 Ontario Limited acquired 287,060 Common Shares from 1000921254 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921254 Ontario Limited) in connection with the wind-up and dissolution of 1000921254 Ontario Limited. As a result of the foregoing transactions, 1000921264 Ontario Limited, 1000921265 Ontario Limited, 1000921257 Ontario Limited, 1000921253 Ontario Limited and 1000921254 Ontario Limited no longer beneficially hold any Common Shares and, therefore, each such person ceased to be a Reporting Person on September 30, 2025. On September 30, 2025, (i) LCC Investments Corp acquired 2,119,523 Common Shares from 1000921307 Ontario Limited and 1000921309 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921307 Ontario Limited and 1000921309 Ontario Limited), in connection with the wind-up and dissolution of each of 1000921307 Ontario Limited and 1000921309 Ontario Limited, respectively; (ii) 1000421133 Ontario Limited acquired 67,423 Common Shares from 1000921299 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921299 Ontario Limited) in connection with the wind-up and dissolution of 1000921299 Ontario Limited; (iii) 2806335 Ontario Limited acquired 64,585 Common Shares from 1000921297 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921297 Ontario Limited) in connection with the wind-up and dissolution of 1000921297 Ontario Limited; (iv) JRD Investments Corp acquired 287,274 Common Shares from 1000921305 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921305 Ontario Limited) in connection with the wind-up and dissolution of 1000921305 Ontario Limited; and (v) GED Investments Corp acquired 298,675 Common Shares from 1000921303 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921303 Ontario Limited) in connection with the wind-up and dissolution of 1000921303 Ontario Limited. As a result of the foregoing transactions, 1000921307 Ontario Limited,1000921309 Ontario Limited, 1000921299 Ontario Limited, 1000921297 Ontario Limited, 1000921305 Ontario Limited and 1000921303 Ontario Limited no longer beneficially hold any Common Shares and, therefore, each such person ceased to be a Reporting Person on September 30, 2025. On October 2, 2025, (i) TCM Investments Corp acquired 198,755 Common Shares from 1000921268 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921268 Ontario Limited) in connection with the wind-up and dissolution of 1000921268 Ontario Limited; and (ii) DYM Investments Corp acquired 178,101 Common Shares from 1000921259 Ontario Limited (such amount representing all Common Shares beneficially owned by 1000921259 Ontario Limited) in connection with the wind-up and dissolution of 1000921259 Ontario Limited. As a result of the foregoing transactions, 1000921268 Ontario Limited and 1000921259 Ontario Limited no longer beneficially hold any Common Shares and, therefore, each such person ceased to be a Reporting Person on October 2, 2025. On November 6, 2025, 1000706525 Ontario Limited, acquired an aggregate of 62,000,000 Common Shares in connection with the wind-up and dissolution of each of the following subsidiaries of 1000706525 Ontario Limited: 1000927194 Ontario Limited, 1000927196 Ontario Limited, 1000927197 Ontario Limited, 1000927200 Ontario Limited, 1000927201 Ontario Limited, 1000927202 Ontario Limited, 1000927205 Ontario Limited, 1000927207 Ontario Limited, 1000927210 Ontario Limited and 1000927211 Ontario Limited (each a "Woodbridge Subsidiary" and collectively, the "Woodbridge Subsidiaries"). As such, as of November 6, 2025, all 62,000,000 Common Shares formerly beneficially owned in the aggregate by the Woodbridge Subsidiaries are now owned by 1000706525 Ontario Limited. No Woodbridge Subsidiary transferred one (1)% or more of the outstanding Common Shares to 1000706525 Ontario Limited pursuant to its wind-up. In addition, because the Woodbridge Subsidiaries no longer beneficially own any Common Shares, each Woodbridge Subsidiary ceased to be a Reporting Person. As such, this Amendment No. 23 constitutes an exit filing for each Woodbridge Subsidiary and each other entity identified as ceasing or having ceased to be a Reporting Person in this Item 5(c). None of the executive officers or directors of the Reporting Persons has effected any transactions in Common Shares during the past 60 days, except as set forth below. On September 15, 2025, Peter J. Thomson, Director and Co Chairman of Woodbridge, acquired 77 Common Shares as compensation for serving as director of Thomson Reuters. On September 25, 2025, The Nikita Foundation, a charity founded by Peter Thomson and his wife, both of whom sit on the board of directors, sold 25,000 Common Shares.

Not applicable.

Not applicable.