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Subsidiaries | 12 Months Ended
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Dec. 31, 2017
SUBSIDIARIES |
SUBSIDIARIES | 31. SUBSIDIARIES Material subsidiaries, each of which is wholly owned, either directly or indirectly, by the company as at December 31, 2017, are shown below:
Material Subsidiaries |  | Principal Activity |
Canadian Operations |  |  |
Suncor Energy Oil Sands Limited Partnership |  | This partnership holds most of the company's Oil Sands operations assets. |
Suncor Energy Ventures Corporation |  | A subsidiary which indirectly owns a 36.74% ownership in the Syncrude joint operation previously owned by COS. |
Suncor Energy Ventures Partnership |  | A subsidiary which owns a 17% ownership in the Syncrude joint operation. |
Suncor Energy Products Partnership |  | This partnership holds substantially all of the company's Canadian refining and marketing assets. |
Suncor Energy Marketing Inc. |  | Through this subsidiary, production from the upstream Canadian businesses is marketed. This subsidiary also administers Suncor's energy trading activities and power business, markets certain third-party products, procures crude oil feedstock and natural gas for its downstream business, and procures and markets natural gas liquids (NGLs) and liquefied petroleum gas (LPG) for its downstream business. |
U.S. Operations |  |  |
Suncor Energy (U.S.A.) Marketing Inc. |  | A subsidiary that procures and markets third-party crude oil, in addition to procuring crude oil feedstock for the company's refining operations. |
Suncor Energy (U.S.A.) Inc. |  | A subsidiary through which the company's U.S. refining and marketing operations are conducted. |
International Operations |  |  |
Suncor Energy UK Limited |  | A subsidiary through which the majority of the company's North Sea operations are conducted. |
The table does not include wholly owned subsidiaries that are immediate holding companies of the operating subsidiaries. For certain foreign operations of the company, there are restrictions on the sale or transfer of production licences, which would require approval of the applicable foreign government.

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