CLB 2018 Annual Report

42 Exhibit 21.1 Significant Subsidiaries of the Registrant at December 31, 2018 Name Legal Seat Ownership % Core Laboratories Australia PTY LTD Perth, Australia 100% Core Laboratories Canada Ltd. Alberta, Canada 100% Core Laboratories International B.V. Amsterdam, The Netherlands 100% Core Laboratories LP Delaware, United States 100% Core Laboratories Malaysia SDN BHD Kuala Lumpur, Malaysia 100% Core Laboratories Sales B.V. Rotterdam, The Netherlands 100% Core Laboratories (U.K.) Limited London, United Kingdom 100% Owen Oil Tools LP Delaware, United States 100% Core Lab de Mexico S.A. de C.V. Mexico City, Mexico 100% Saybolt Belgium N.V. Antwerp, Belgium 100% Saybolt LP Delaware, United States 100% Saybolt Nederland B.V. Rotterdam, The Netherlands 100% Saybolt (Singapore) PTE LTD Singapore, Singapore 100% Stim-Lab, Inc. Oklahoma, United States 100% JSC Petroleum Analysts Moscow, Russian Federation 100% Pursuant to Item 601(b)(21)(ii) of Regulation S-K, the names of other subsidiaries are omitted because, considered in the aggregate, they would not constitute a significant subsidiary as of the end of the year covered by this report.