Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ý Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 (State or other jurisdiction of incorporation or organization) Delaware 95-3797580 For the quarterly period ended March 31, 2019 OR o Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period to Commission file number 001-10962 Callaway Golf Company (Exact name of ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number 1-10962 Callaway Golf Company (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) ( ...