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

For the month of June 2018

Commission File Number: 001-37403

THE STARS GROUP INC.

(Translation of registrant’s name into English)

200 Bay Street

South Tower, Suite 3205

Toronto, Ontario, Canada

M5J 2J3

(Address of principal executive offices)

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 o             Form 40-F x

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):  o

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):  o

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.

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EXHIBIT INDEX

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Exhibit 99.1

The Stars Group Announces Proposed Public Offering of Common Shares

TORONTO, June 18, 2018 — The Stars Group Inc. (Nasdaq: TSG; TSX: TSGI) (“The Stars Group” or the “Company”) announced today that it has filed a preliminary prospectus supplement (the “Preliminary Supplement”) to its short form base shelf prospectus dated January 16, 2018 relating to a proposed underwritten marketed public offering of common shares of the Company (the “Offering”).  The Offering contemplates a treasury offering of 15,000,000 common shares by the Company and a secondary offering of 6,000,000 common shares by certain shareholders (the “Selling Shareholders”). The Offering will be priced in the context of the market with the price and total size of the Offering to be determined at the time of entering into an underwriting agreement for the Offering.

The Company and the Selling Shareholders will also grant the underwriters for the Offering an over-allotment option to purchase up to an additional 15% of the common shares to be sold pursuant to the Offering. The over-allotment option will be exercisable for a period of 30 days after closing.

The Stars Group intends to use the net proceeds from the treasury offering, together with debt financing and cash on hand to fund the previously announced acquisition of Sky Betting & Gaming (the “Acquisition”). The Offering is not contingent on the closing of the Acquisition or any debt financing. If for any reason the Acquisition does not close, the Company intends to use the net proceeds from the Offering for general corporate purposes.

Morgan Stanley, J.P. Morgan and Deutsche Bank Securities Inc. are acting as the joint book-running managers and representatives of the underwriters for the Offering. The additional joint book-running managers for the Offering are Goldman Sachs & Co. LLC, Barclays, BMO Capital Markets and Macquarie Capital (USA) Inc. The co-managers for the Offering are Blackstone Capital Markets, Cormark Securities (USA) Limited, Canaccord Genuity Corp., Union Gaming Securities, LLC and Investec Bank plc.

The Offering is subject to customary conditions including, but not limited to, the listing of the treasury common shares on the Toronto Stock Exchange and the Nasdaq and the approval of the Toronto Stock Exchange.

The Preliminary Supplement has been filed with the securities regulatory authorities in each of the provinces and territories of Canada. The Preliminary Supplement has also been filed with the U.S. Securities and Exchange Commission (the “SEC”) as part of a registration statement on Form F-10 (the “Registration Statement”) under the U.S./Canada Multijurisdictional Disclosure System. The Preliminary Supplement and the Registration Statement contain important detailed information about the Offering. A copy of the Preliminary Supplement and related short form base shelf prospectus can be found on SEDAR at www.sedar.com and on EDGAR at www.sec.gov, and a copy of the Registration Statement can be found on EDGAR at www.sec.gov. Copies of the Preliminary Supplement and the Registration Statement may also be obtained in the United States from Morgan Stanley, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, NY 10014;  J.P. Morgan Securities LLC, Attention: Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717; or Deutsche

Bank Securities Inc., Attention: Prospectus Group, 60 Wall Street, New York, NY 10005-2836 and in Canada from J.P. Morgan Securities Canada Inc., Attention: Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717.  Prospective investors should read the Preliminary Supplement and the Registration Statement before making an investment decision.

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

About The Stars Group

The Stars Group is a leading provider of technology-based product offerings in the global gaming and interactive entertainment industries. The Stars Group directly or indirectly, including through its Stars Interactive Group division, owns gaming and related consumer businesses and brands, such as PokerStars, PokerStars Casino, BetStars, Full Tilt, and the PokerStars Players No Limit Hold’em Championship, European Poker Tour, PokerStars Caribbean Adventure, Latin American Poker Tour, Asia Pacific Poker Tour, PokerStars Festival and PokerStars MEGASTACK live poker tour and event brands. These brands together have millions of registered customers globally and collectively form the largest poker business in the world, comprising online poker games and tournaments, sponsored live poker competitions, marketing arrangements for branded poker rooms in popular casinos in major cities around the world, and poker programming and content created for television and online audiences. The Stars Group, through certain of these and other brands, also offers non-poker gaming products, including casino and sportsbook. The Stars Group, through certain of its subsidiaries, is licensed or approved to offer, or offers under third party licenses or approvals, its product offerings in various jurisdictions throughout the world, including in Europe, both within and outside of the European Union, Australia, the Americas and elsewhere. In particular, PokerStars is the world’s most licensed online gaming brand, holding licenses or related operating approvals in 17 jurisdictions.

Cautionary Note Regarding Forward Looking Statements and Other Information

This news release may contain forward-looking statements and information within the meaning of applicable securities laws, including, without limitation, the planned Offering and Acquisition, the use of proceeds from the Offering, and plans regarding the financing of the Acquisition. Forward-looking statements can, but may not always, be identified by the use of words such as “anticipate”, “plan”, “continue”, “estimate”, “expect”, “may”, “will”, “intend”, “could”, “might”, “would”, “should”, “believe”, and similar references to future periods or the negatives of these words and expressions. These statements are based on management’s current expectations and are subject to a number of risks, uncertainties, and assumptions, including litigation risk, market and economic conditions, business prospects or opportunities, future plans and strategies, projections, anticipated events and trends and regulatory changes that affect The Stars Group, its subsidiaries, and its and their respective customers and industries. There can be no assurance that actual results will not differ materially from those expressed or implied in forward-looking statements. Undue reliance should not be placed on forward-looking statements. Please refer to The Stars Group’s most recent annual information form and annual and interim financial statements and management’s discussion and analysis for more information about the factors, assumptions and risks that may apply to The Stars Group’s forward-looking statements. Each

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forward-looking statement speaks only as of the date hereof, and The Stars Group undertakes no obligation to correct or update any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by applicable law.

For investor relations, please contact:

Tim Foran

Tel: +1 437-371-5730

ir@starsgroup.com

For media inquiries, please contact:

Eric Hollreiser

Press@starsgroup.com

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