6-K

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.   20549

Report of Foreign Private Issuer

Pursuant to Rule 13a - 16 or 15d - 16 of

the Securities Exchange Act of 1934

For the month of: May, 2019 Commission File Number: 1-12384

SUNCOR ENERGY INC.

(Name of registrant)

150 – 6th Avenue S.W.

P.O. Box 2844

Calgary, Alberta

Canada, T2P 3E3

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.

	SUNCOR ENERGY INC.
Date:	By:
May 29, 2019		“Shawn Poirier”
		Shawn Poirier
		Assistant Corporate Secretary

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EXHIBIT INDEX

Exhibit	Description of Exhibit
99.1	Suncor Energy Inc. Extractive Sector Transparency Measures Act Report for the reporting year January 1, 2018 to December 31, 2018

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EX-99.1

EXHIBIT 99.1

Suncor Energy Inc. Extractive Sector Transparency Measures Act Report for the reporting year January 1, 2018 to December 31, 2018

AUTORITE DES MARCHES FINANCIERS STATEMENT UNDER THE ACT RESPECTING TRANSPARENCY MEASURES IN THE MINING, OIL AND GAS INDUSTRIES (s. 1) Fiscal year covered by the statement: from January 1, 2018 to December 3 1, 201 8 Name of the entity filing the statement: Suncor Energy Inc. Name(s) of the subsidiary or subsidiaries for which the entity files the statement, where applicable: Petro-Canada Terra Nova Partnership; Petro-Canada Hibernia Partnership; Petro-Canada Hebron Partnership: Canadian Oil Sands Partnership; Suncor Energy Oil Sands Limited Partnership; Suncor Energy Offshore Exploration Partnership; Suncor Energy Ventures Partnership CERTIFICATE I certify that I have examined the information contained in the statement of Suncor Energy In c. • for the fiscal year that began on January l, 201 8. and ended on December 31, 2018 To my knowledge and having exercised due diligence, the information contained in the statement is, in all material respects for the purposes of the Act, true, accurate and complete. Full name of the officer or director: Alister Cowan Title of position: Executive Vice President and Chief Financial Officer Date: May 2 1, 20 19 [Signature]

Amended Report Canadian Oil Sands Partnership: E984046, Extractive Sector Transparency Measures Act - Annual Report Reporting Entity Name Suncor Energy Inc. Reporting Year From 1/1/2018 To: 12/31/2018 Date submitted 5/24/2019 Reporting Entity ESTMA Identification Number E405435 Original Submission Other Subsidiaries Included (optional field) For Consolidated Reports - Subsidiary Reporting Entities Included in Report: Petro-Canada Terra Nova Partnership: E368056, Petro-Canada Hibernia Partnership: E014222, Petro-Canada Hebron Partnership: E294659, Suncor Energy Oil Sands Limited Partnership: E761283, Suncor Energy Offshore Exploration Partnership: E718793, Suncor Energy Ventures Partnership: E895970 Not Substituted Attestation by Reporting Entity In accordance with the requirements of the ESTMA, and in particular section 9 thereof, I attest I have reviewed the information contained in the ESTMA report for the entity(ies) listed above. Based on my knowledge, and having exercised reasonable diligence, the information in the ESTMA report is true, accurate and complete in all material respects for the purposes of the Act, for the reporting year listed above. Full Name of Director or Officer of Reporting Entity Alister Cowan Date 5/21/2019 Position Title Executive Vice President and Chief Financial Officer

Canadian Oil Sands Partnership: E984046, Extractive Sector Transparency Measures Act - Annual Report Reporting Year From: 1/1/2018 To: 12/31/2018 Reporting Entity Name Suncor Energy Inc. Currency of the Report CAD Reporting Entity ESTMA Identification Number E405435 Subsidiary Reporting Entities (if necessary) Petro-Canada Terra Nova Partnership: E368056, Petro-Canada Hibernia Partnership: E014222, Petro-Canada Hebron Partnership: E294659, Suncor Energy Oil Sands Limited Partnership: E761283, Suncor Energy Offshore Exploration Partnership: E718793, Suncor Energy Ventures Partnership: E895970 Payments by Payee Country Payee Name Departments, Agency, etc… within Payee that Received Payments2 Taxes Royalties Fees Production Entitlements Bonuses Dividends Infrastructure Improvement Payments Total Amount paid to Payee Notes Canada Government of Canada 367,820,000 127,750,000 13,240,000 - - - - 508,810,000 Includes royalties that are remitted directly to the Canadian federal government that are then sent to the Government of Newfoundland and Labrador for the Terra Nova, White Rose, Hebron and Hibernia Extension projects. Canada Canada Newfoundland and Labrador Offshore Petroleum Board - - 3,580,000 - - - - 3,580,000 Canada -Alberta Athabasca Chipewyan First Nation - - 1,400,000 - - - - 1,400,000 Canada -Alberta Chipewyan Prairie Dene First Nation - - 470,000 - - - - 470,000 Canada -Alberta City of Calgary 740,000 - - - - - - 740,000 Canada -Alberta Fort Chipewyan Metis Local 125 - - 290,000 - - - - 290,000 Canada -Alberta Fort McKay First Nation - - 1,000,000 - - - - 1,000,000 Canada -Alberta Fort McKay Metis Community Association - - 350,000 - - - - 350,000 Canada -Alberta Fort McMurray #468 First Nation - - 630,000 - - - - 630,000 Canada -Alberta Fort McMurray Metis Local 1935 - - 120,000 - - - - 120,000 Canada -Alberta Government of Alberta 152,090,000 361,420,000 19,040,000 - - - - 532,550,000 Canada -Alberta Heart Lake First Nation - - 120,000 - - - - 120,000 Canada -Alberta Mikisew Cree First Nation - - 550,000 - - - - 550,000 Canada -Alberta Municipality of Wood Buffalo (Alberta) 77,700,000 - - - - - - 77,700,000 Canada -British Columbia Government of British Columbia 10,000 70,000 80,000 - - - - 160,000 Canada -Newfoundland and Labrador Government of Newfoundland and Labrador - 148,440,000 - - - - - 148,440,000 Includes royalties paid in relation to the Hibernia Base project. Canada -Quebec Government of Quebec 26,200,000 - 30,000 - - - - 26,230,000

Canadian Oil Sands Partnership: E984046, Energy Inc.'s 2018 consolidated financial statements. CAD. CAD. - All amounts have been rounded to the nearest $10,000 CAD. Extractive Sector Transparency Measures Act - Annual Report Reporting Year From: 1/1/2018 To: 12/31/2018 Reporting Entity Name Suncor Energy Inc. Currency of the Report CAD Reporting Entity ESTMA Identification Number E405435 Subsidiary Reporting Entities (if necessary) Petro-Canada Terra Nova Partnership: E368056, Petro-Canada Hibernia Partnership: E014222, Petro-Canada Hebron Partnership: E294659, Suncor Energy Oil Sands Limited Partnership: E761283, Suncor Energy Offshore Exploration Partnership: E718793, Suncor Energy Ventures Partnership: E895970 Payments by Payee Country Payee Name Departments, Agency, etc… within Payee that Received Payments2 Taxes Royalties Fees Production Entitlements Bonuses Dividends Infrastructure Improvement Payments Total Amount paid to Payee Notes Libya Government of Libya National Oil Corporation 122,800,000 390,350,000 - - 740,000 - - 513,890,000 Bonuses include social development payments as required by certain Exploration and Production Sharing Agreements in Libya. Taxes & Royalties taken in kind and converted to cash basis using the same methodology (fair market value) as Suncor Translated using the financial year average foreign exchange rates: 1 USD : 1.2962 CAD. Norway Government of Norway 130,000 - 1,600,000 - - - - 1,730,000 Translated using the financial year average foreign exchange rate: 1 NOK : 0.1594 United Kingdom of Great Britain and Northern Ireland Her Majesty’s Government Her Majesty's Revenue and Customs Cumbernauld 509,900,000 - - - - - - 509,900,000 Translated using the financial year average foreign exchange rate: 1 GBP : 1.7302 Additional Notes: - All payments are reported in Canadian dollars.

Canadian Oil Sands Partnership: E984046, report. CAD. 2018 consolidated financial statements. CAD. - All amounts have been rounded to the nearest $10,000 CAD. Extractive Sector Transparency Measures Act - Annual Report Reporting Year From: 1/1/2018 To: 12/31/2018 Reporting Entity Name Suncor Energy Inc. Currency of the Report CAD Reporting Entity ESTMA Identification Number E405435 Subsidiary Reporting Entities (if necessary) Petro-Canada Terra Nova Partnership: E368056, Petro-Canada Hibernia Partnership: E014222, Petro-Canada Hebron Partnership: E294659, Suncor Energy Oil Sands Limited Partnership: E761283, Suncor Energy Offshore Exploration Partnership: E718793, Suncor Energy Ventures Partnership: E895970 Payments by Project Country Project Name Taxes Royalties Fees Production Entitlements Bonuses Dividends Infrastructure Improvement Payments Total Amount paid by Project Notes Canada -Alberta Base Mine 32,280,000 192,210,000 4,010,000 - - - - 228,500,000 Canada -Alberta Firebag 40,920,000 106,520,000 3,320,000 - - - - 150,760,000 Canada -Alberta MacKay River 4,420,000 62,700,000 6,900,000 - - - - 74,020,000 Canada -Newfoundland and Labrador Hebron - 3,600,000 - - - - - 3,600,000 Canada -Newfoundland and Labrador Hibernia - 200,640,000 - - - - - 200,640,000 Hibernia Base and Extension projects have been combined for the purposes of this Canada -Newfoundland and Labrador Terra Nova - 59,380,000 3,800,000 - - - - 63,180,000 Canada -Newfoundland and Labrador White Rose - 12,570,000 - - - - - 12,570,000 Norway Norway 130,000 - 1,600,000 - - - - 1,730,000 Translated using the financial year average foreign exchange rate: 1 NOK : 0.1594 Libya Libya 122,800,000 390,350,000 - - 740,000 - - 513,890,000 Bonuses include social development payments as required by certain Exploration and Production Sharing Agreements in Libya. Taxes & Royalties taken in kind and converted to cash basis using the same methodology (fair market value) as Suncor Energy Inc.'s Translated using the financial year average foreign exchange rate: 1 USD : 1.2962 CAD. United Kingdom of Great Britain and Northern Ireland U.K. Oil & Gas Taxes 509,900,000 - - - - - - 509,900,000 Translated using the financial year average foreign exchange rate: 1 GBP : 1.7302 Canada Other 100,000 70,000 18,550,000 - - - - 18,720,000 Includes Emerging properties in the Oil Sands business unit (Meadow Creek, Dover, Lewis, Frontier, Thornbury and Chard) and North America Onshore in the Exploration and Production business unit. Additional Notes: - All payments are reported in Canadian dollars.