Exhibit 99.1

Thomson Reuters Corporation

333 Bay Street, Suite 300

Toronto, Ontario M5H 2R2

Canada

Tel (647) 480-7000    

March 3, 2021

British Columbia Securities Commission	Nova Scotia Securities Commission
Alberta Securities Commission Financial and Consumer Affairs Authority of Saskatchewan The Manitoba Securities Commission Ontario Securities Commission Autorité des marchés financiers Financial and Consumer Services Commission (New Brunswick)	Office of the Superintendent of Securities, Prince Edward Island Office of the Superintendent of Securities Service, Newfoundland     and Labrador Office of the Superintendent of Securities, Yukon Office of the Superintendent of Securities, Northwest Territories Nunavut Securities Office Toronto Stock Exchange CDS Clearing and Depository Services Inc. The Depository Trust Company

Re: Thomson Reuters – Notification of Meeting and Record Date

Ladies and Gentlemen,

Pursuant to National Instrument 54-101, Communication with Beneficial Owners of Securities of a Reporting Issuer (NI 54-101), we advise the following:

Date of Meeting	June 9, 2021
Record Date for Notice and Voting	April 12, 2021
Beneficial Ownership Determination Date	April 12, 2021
Class of Securities Entitled to Receive Notice of and Vote at the Meeting	Common Shares
Whether the Meeting is a Special Meeting (as defined by NI 54-101)	No
Issuer Using Notice-and-Access for Registered Holders and Beneficial Owners	Yes
Issuer Sending Proxy-Related Materials Directly to Non-Objecting Beneficial Owners	No
Issuer Paying for Proximate Intermediaries to Send Proxy-Related Materials to Objecting Beneficial Owners	Yes
CUSIP	884903709
Notice-and-Access Stratification	Copies of the management proxy circular and other proxy-related materials will be electronically delivered to shareholders in accordance with existing requests

Sincerely,

/s/ Kathryn Ouellette

Kathryn Ouellette

Assistant Secretary