UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

THOMSON REUTERS CORPORATION

(Translation of registrant’s name into English)

333 Bay Street, Suite 400

Toronto, Ontario M5H 2R2, Canada

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  ☐            Form 40-F  ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ☐

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

EXHIBIT INDEX

Exhibit 99.1

Thomson Reuters Reminds Non-Canadian Taxable Shareholders of “Opt-Out” Alternative

for Return of Capital Transaction

Action is required to opt out

Opt-out deadlines vary by bank/broker and may be as early as November 13, 2018

TORONTO, November 7, 2018 – Thomson Reuters (TSX/NYSE: TRI) today reminded its shareholders who are taxable in a jurisdiction outside of Canada that they are able to “opt out” of the company’s proposed return of capital transaction. For shareholders who are subject to income tax outside Canada, opting out of the transaction may be preferable to participating in the transaction.

The return of capital transaction consists of a cash distribution of US$4.45 in cash per common share and a consolidation of the company’s outstanding common shares (or “reverse stock split”) on a basis that is proportional to the cash distribution.

The transaction is generally expected to be tax-free for Canadian tax purposes. As a result, Canadian resident shareholders are generally not eligible to opt out. Eligibility criteria for opting out of the transaction is set out on page 2 of this news release.

Opting out

If you’re not eligible to opt out of the transaction or are eligible to opt out but decide not to, no action is required to participate in the transaction.

Tax Consequences for U.S. Shareholders

The expected tax consequences for a U.S. shareholder of the proposed return of capital transaction generally are as follows.

The tax consequences of the proposed return of capital transaction are complex. This summary reflects certain assumptions and limitations, and it is qualified in its entirety by the “Income Tax Considerations” section of the management proxy circular.

Thomson Reuters Reminds Non-Canadian Taxable Shareholders of “Opt-Out” Alternative for Return of Capital Transaction

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Additional information and assistance

To be eligible to opt out of the return of capital transaction, a shareholder must be an “Eligible Opt-Out Shareholder,” which means a shareholder (whether registered or non-registered) who is (a) not a resident of Canada for Canadian income tax purposes and is subject to income tax in a jurisdiction other than Canada (and is not exempt from income tax in that jurisdiction) or (b) an individual who is a resident of Canada for Canadian income tax purposes and who is also subject to income tax in a jurisdiction other than Canada as a resident of that other jurisdiction (and is not exempt from income tax in that jurisdiction).

Details of the transaction (including information regarding the opt-out right and tax considerations) are described in the management proxy circular and related materials, which are available on www.thomsonreuters.com in the “Investor relations” section. The documents were filed with the Canadian securities regulatory authorities on SEDAR and are available at www.sedar.com. The documents were also furnished to the U.S. Securities and Exchange Commission through EDGAR and are available at www.sec.gov.

Non-registered shareholders who hold their shares indirectly through an intermediary (such as an investment dealer, stock broker, bank, trust company or other nominee) should contact their intermediary if they have questions or need assistance.

Registered shareholders who have questions or need assistance may contact Computershare Trust Company of Canada, at 1.800.564.6253 (toll-free in Canada and the U.S.) or at 1.514.982.7888 (outside Canada and the U.S.) or at the following e-mail address: corporateactions@computershare.com.

Shareholders who have questions or need assistance may also contact D.F. King & Co., Inc., who is acting as Information Agent for the transaction, at 1.800.330.5897 (toll-free in Canada and the U.S.) or at 1.212.269.5550 (outside Canada and the U.S., banks, brokers and collect calls) or at the following email address: tri@dfking.com.

Taxable non-Canadian resident shareholders are strongly urged to read the management proxy circular and other related materials carefully and to consult with their financial, tax and legal advisors prior to making any decision with respect to the transaction.

Thomson Reuters (TSX/NYSE: TRI) is the world’s leading provider of news and information-based tools to professionals. Our worldwide network of journalists and specialist editors keep customers up to speed on global developments, with a particular focus on legal, regulatory and tax changes. Thomson Reuters shares are listed on the Toronto and New York Stock Exchanges. For more information on Thomson Reuters, visit tr.com and for the latest world news, reuters.com.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements in this news release are forward-looking, including statements relating to the return of capital transaction and the anticipated tax treatment for shareholders participating in the transaction and those opting out. These forward-looking statements are based on certain assumptions and reflect our company’s current expectations. As a result, forward-looking statements are subject to a number of risks and uncertainties that could cause actual results or events to differ materially from current expectations, including other factors discussed in materials that Thomson Reuters from time to time files with, or furnishes to, the Canadian securities regulatory authorities and the U.S. Securities and Exchange Commission. There is no assurance that the return of capital transaction will be completed or that other events described in any forward-looking statement will materialize. Except as may be required by applicable law, Thomson Reuters disclaims any obligation to update or revise any forward-looking statements.

Thomson Reuters Reminds Non-Canadian Taxable Shareholders of “Opt-Out” Alternative for Return of Capital Transaction

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